572b tube replacement. Replace 4, 572B tubes with 2, GI-7B tubes 2.

Max plate current rating is about the same for both tubes, and the 572B (also known as the T160L) has a slightly higher mu. Used in pairs, DX Engineering 572B tubes are capable of generating up to 600 watts of RF transmit power; quads will produce 1,200 watts. 3. The three-tube 811 model is not neutralized. They have proven themselves in all kinds of amateur, commercial, and military service. Ameritron 811A Replacement Power Tubes #380-0811A $30 X 4 = $120 AMERITRON PARTS: GAS TUBE, SURGE ARRESTER, 150V: #304-6015 (QTY: TWO) ABOUT $2 EACH HV ARC RESISTOR, 10 OHM 5% RCD 175P: #110-1100-1 (QTY: TWO) ABOUT $3. New carbon-comp resistors throughout 4. exploded grid resistor city. These tubes will serve as 572B Four Matched Vacuum Tubes, Power Triode, Direct replacement for the 811A, Set of 4. 572B tubes produce 800 watts PEP output with about 80 watts drive. 1. Typical operating conditions in amateur service are a Va of 2,400 V and an output power from a pair of 400 Watts. Jan 2, 2020 · W8JI: If you're still reading this thread, I just wanted to confirm that the 3-hole AL-811 is indeed NOT neutralized and that the switch from 811A to 572B tubes will therefore NOT raise neutralization issues on that unit. Price is for a Matched Pair. They matched the replacement to my original three tubes and sent them back to me, pre-paid UPS. The filament drain is the same. Old tube making processes created wide variations in production, so testing and matching tubes into sets was required. Ameritron AL811H converted to AL811HD with 4 x 572B tubes. The Svetlana 572B may be used as a direct drop-in replacement in equipment designed for the 811A, T160L or 572B. We addressed some issue with the amp. Tubes can last a long time if all the related components are in spec. Grid Overload Protection protects the tubes from excessive grid current due to mistuning and it protects against excessive drive power. 00 shipping. 811 and 572 tubes are particularly bad about this. The T160L is a through-back to an early tube numbering scheme by Eimac, Taylor, and Shuguang Vacuum Tube 572B Emitter Tube: 572B DESCRIPTION Direct heating cathode, high gain triode 572B can be used in wireless equipment for power amplification. Soon, Cetron replaced United Electronics as the supplier and labeled their tube 572B/T160L. We now have a working inventory of over 7,800 different radio tubes, amplifier tubes, and industrial vacuum tubes in stock. Returns considered on a case by case basis. Calculate shipping. The only rub was that those PSVANE tubes use the same tube glass envelope for the 811 as the 572b which is fine, but that little metal tab was in the way of the one tube going into the socket. 0 out of 5 stars The 572B valve is a brand-new stock item that is highly sought after by Ham Radio enthusiasts. High-quality fabrication and vacuum processing at high temperature enables Svetlana to manufacture the new 572B with consistent performance and extended life. Aging or Degassing Tubes A look at what's inside FL-1000 ~ 2100Z Most amateur radio operators of the 21st century are well acquainted with the world renown FT-101 and the matching line of accessories including the FL-2100B compact 1200w PEP linear amplifier. Check Details 1. 1 year limited warranty on manufacturer defects. New power supply board with new capacitors, diodes, resistors and metering resistor string. 572B Vintage Svetlana Triode Transmitting Tube (NOS/NIB) Only to be used in vertical position The Svetlana 572B is a high-mu power triode intended for use in Class AB, Class B and Class C, RF and audio amplifiers. With its reliable construction and high power handling capabilities, the 572B valve is a popular choice among radio operators. Feb 11, 2024 · 811a tube tubes amplifier 572b modern mindful dissipation higher tuning operators modes transmitting average times when time w8ji 811 tube history including 811a 572b Ameritron tubes. Russian Triodes GS31/GS35b 3tf7 solid state replacement Cetron Jan 811A RF Concepts 3--500ZG 572B T160L Shuguang Greenstone (USA), Inc. I have only used it for 2 months, and KAARAAACKKK!!!! ,. Ameritrons new class of Near Legal Limit Amplifiers give you nearly full legal SSB power output for 65% of the price of a full legal limit amplifier and no one will ever know the difference! You get 1300 Watts PEP SSB nominal power out on amateur bands 160-15M. In normal operation the anode voltage swings between twice high voltage supply to a few hundred volts positive. Welcome to the Vacuum Tubes division of Radio Electric Supply, home of the largest supply of New Old Stock vacuum tubes in the world. DX Engineering 572B Power Tube DXE-572B DX Engineering 572B Power Tubes are available for all-purpose Amateur Radio service. How We Test Tubes. The tube has developed an intermittant short from the grid to filament. 572B Four Matched Vacuum Tubes, Power Triode, Direct replacement for the 811A, Set of 4. In standby mode they should last a lifetime. After much reading, I decided to try 572B tubes introduced by DX Engineering in 2016. 572b tube tubes ameritron finals item representation ame dxengineering replacement final linear Get the AL-811HD with 572B tubes AL-811HD gives you the AL-811H with four 572B tubes installed. The valve is a hi μ power triode, used in many RF linear amplifiers. Enjoy. Also sold as a matched pair (572B-2), set of three (572B-3), and set of four (572B-4). Two Illuminated Panel Meters: The AL TOF Tuning Aid. 3V Current 4 A Amplification factor (average) 170 Vacuum Tube Evolution. Nov 22, 2023 · Tube 811a 572b vacuum anode1pc psvane 811a vacuum tube tested replace 811 fu-811 for hifi tube 811a tube 572b tube historyInside the 572b tube. + A dynamic bias circuit eliminates hundreds of watts of unnecessary heat generation in the power amplifier tubes. They say that the tube can The 572B will not provide any more gain or >> > power output than the 811 unless you modify the power supply for >> > about 40% more voltage (2 KV vs. 99. fits 572B, 810, 866, 813, 572B-RFP Fast Warm Up Time: The 572B tubes take approximately 10 seconds to warm-up. Whether you are a seasoned Ham Radio enthusiast or just starting, the Aug 30, 2017 · Good news is that RF Parts now sells a reliable 572b replacement tube so you should be good to go even if the tubes in the amp you get are soft. C $28. Vacuum Tube Evolution. 811a tube 572b tube history811/812/572b – premium vacuum tubes 572b vacuum psvane 811a single tube 812a572b tubes. 3 0. Specifications: Warranty. 127. 00. For higher duty cycle operation with 572B tubes, a doubling of CFM is required. Others indicated they suspect the vacuum may be less than vintage transmitting tubes. Unfortunately, the tubes have fallen out of production many years ago. 126 diameter anode stem. Literally you could shake the tube and see this bouncing around inside the glass. Tubes with long thin grid leads and large internal structures sometimes have significant anode-to-cathode feedthrough. This is a suitable replacement for any 572B / 160L (US) tube type. Add to basket. 811A: Hi-mu power triode RF vacuum tube designed for use as an audio frequency amplifier or modulator, RF amplifier, or oscillator. The 812 was a moderately low mu tube, primarily intended for grid driven modulator service. Two 572B are superior to four 811A tubes due to the graphite plate. Dec 29, 2016 · 572B-RFP Transmitting Tube, SELECT, RF Parts. 572B tubes are found in several new Ameritron Amplifiers, including the celebrated AL-572 and the AL-811HD. Jan 11, 2024 · 1pc psvane hifi 811a triode vacuum tube tested replace 811 fu-811a for. One word of caution: The tube sockets on the Ameritron amp use a small horseshoe shaped clip which adds tension to the socket/tube leg connection. I have had no serious problems with it. PRC Tube, 572b, mfg: shuguang, 572B-USA Transmitting tube, USA BRAND, 572BM3-RFP Transmitting Tube, SELECT Matched Set of 3, RF Parts, PARA-1 Parasitic Suppressor, For use on 3-500Z, 572B, etc. com • view topic572b tubes. It seems as though this tube has a severe defect. May 10, 2023 · The Machlett 572B is a power triode designed for use as a RF Oscillator, RF Power Amplifier and audio frequency modulator. Purchased 4 of theses 572b tubes to replace the 811a in my Ameritron AL-811H. Compare prices, specifications and availability of different models and quantities. I just recently purchased a new Svetlana 572B tube for my Heathkit SB-200 amplifier. Get a higher power tank circuit and grid overload protection. New electrolytic capacitors under the RF deck 3. The 572B is a direct replacement for the 811A, but has a graphite anode for increased per 572B. Heat dissipating connectors are used to make electrical connections to the plate and grid terminals of Transmitting tubes, and at same time, provide efficient heat transfer from Ameritron 572B Replacement Final Tubes. These whisper-quiet desktop linear amplifiers plug into your nearest 120 Vac outlet, so no special wiring is needed. RF Parts then contacted me and told me that they would like to send me one replacement tube, along with my original three, in an effort to replace the smoky looking tube. New TX relay 5. The AL-811H and 30L-1 use 811A tubes and the Yaesu FL-2100B and SB-200 use a pair of 572b tubes. Arcing or Gassy 572B Tubes . 0 Amperes Find various types of 572B tubes for amplifiers, such as China, Taylor and Svetlana. Listed under the Radio Equipment/HF Amplifiers/Ameritron AL-811 category that is about Ameritron AL-811 and AL-811H HF Amateur Radio RF power amplifier. Order yours today! Find Penta Labs RF Vacuum Tubes 572B-3Find Penta Labs RF Vacuum Tubes 572B-3 and get Free Standard Shipping on orders over $99 at Summit Racing! \n Shop Amplifier Replacement Parts at DX Engineering. Ameritron al-811 811a tubeAmeritron al-811 amplifier with extra cetron 572b/t160l tubes 811a four tubes set811h al ameritron tubes. 3 Volts ; Filament Current = 4. With a maximum plate dissipation of 125W and maximum frequency of 110MHz, this tube is capable of delivering clear, detailed audio without distortion. The tester measures peak emission, peak grid current, and voltage required to reach the saturated current. The whole process was painless and Merit at RF Parts Apr 17, 2024 · 811A tube 572B tube history. Price $79. New Listing 10PCS Vacuum Tube Anode Cap 14mm Gold Plated for 813 805 811 572B 872 Audio HIFI Free Shipping - Penta Labs RF Vacuum Tubes with qualifying orders of $99. org/ameritron-al-811-tube-upgrade-from-811a-t Aug 19, 2024 · Shop Amplifier Replacement Parts at DX Engineering. Various brands. Ameritron 572B Replacement Final Tubes are available for the Ameritron AL-572 series of 1,300 Watt power amplifiers. New Current Production ** No returns, however Defective Tubes will be replaced free of charge for 13 months** The 572B tube has been a proven performer in Amateur, commercial, and military service. 4. 1PC PSVANE 811A Triode Valve Tube Tested Replace 811 FU-811 for HiFi. Earlier 3-star review posted by MM0IMC on 2014-01-20 I finally got a replacement for the duff valve (tube) from China, but the heater filament seemed to be somewhat dimmer than the other three. TAYLOR is the preferred choice for FL2100, SB200/SB201, 10-160L, 30L1, etc. Each tube has a heavy duty graphite anode, low loss ceramic base, superior titanium getter, and legendary quality. And, you can get 700 watts PEP vs the recommended 600 watts PEP from the 811A tubes. New Current Production ** No returns, however Defective Tubes will be replaced free of charge for 13 months** It is perfectly acceptable to replace the 811 tubes with three or four 572B tubes in the AL811 or AL811H respectively to increase duty cycle and tube reliability. The amp produces 800w CW 10m, 850w CW Apr 3, 2005 · 2 , 3 even 4 tube commercially made multi band models don’t pull much current Even if a little sag on the 120 line , the change is minimal in the filament winding Almost every cetron 572b tube I have tested over the years has tested near full output. 8 30 MHz Radiation and forced air Aug 29, 2017 · Upgraded the 811A tubes in my AL-811 Amplifier to 572B tubes. So far, it has been working wonderfully. Here I show the repair and modifications on a Ameritron al811h Mar 29, 2024 · Tubes 572b inspected soldering. Oct 3, 2022 · A short video of my AL-811H after minor repairs in 2015. this article examines the performance of the ameritron al 811h amplifier with the supplied 811a tubes and with 572b tubes and details a procedure for replacement of existing tubes . The 572B is an indirect descendent of the 811 tube. 811a anode w8ji permissibleDiy project : 811a + 211 tube se power amp Tube vacuum 811a fu psvane replace hifi exquis electron lamp811a tube 572b tube history. It is a drop-in replacement for the 811A and much more reliable. Oct 10, 2023 · Ameritron al-811 amplifier with extra cetron 572b/t160l tubesAmeritron 380-0572b ameritron 572b replacement final tubes Dxengineering ame 572b ameritron tubesAmeritron amplifier linear 811 hf 600w yaesu 811a tubes amplifiers 572b uhf 500w antenna mfj escolha pasta. Find helpful customer reviews and review ratings for 2pcs PSVANE 572B Vacuum tube for Amplifier Tested by Factory Brand New at Amazon. If your tester will set up for an 811, it will also test a 572B. Come to think of it in the 10 years I restored and listened to tube radios I never lost a tube in a radio that was working properly. On the 572B detasheet, they didn`t mention the amplification factor, the Rp and Vmax (continus). Throughout history, to speed development and reduce tooling costs, newer tubes use tooling from older tubes. This valve is specifically designed for use in amplifiers and is known for its exceptional performance. 9V 5-watt Zener diodes to reduce tube heat 5. old 572B with new matched Svetlana tubes Time Owned: 0 to 3 months. Jul 7, 2023 · Check Details Tube fu 811a vacuum psvane replace hifi exquis electron lamp. Guitar Pedals. The AL-811H amp is rated for 800 watts PEP output with either 811A or 572B tubes installed, but I think that number is a little high myself. Now, each DX Engineering 572B tube is precision manufactured to a high standard, so Oct 3, 2023 · 572b tubes dxe811a tube 572b tube history 572b tubes. respect to the base pins to avoid internal shorts in equipment designed for horizontal tube mounting. 572B tubes offer rugged, reliable operation even on RTTY and SSTV. I ended up buying a pair of the Chinese tubes which are branded “PSVANE 572B”. Svetlana Outline drawing Thoriated-tungsten 6. 380-0811a, al-811 amplifierAmplifier 811a 2m ameritron 811a fu hifi tested 1pc amplifier vacuum psvane triode replace tube811 811a 572b. The weak point in 811 tubes is not the grid, the grid current, or the drive power. 0 out of 5 stars The 572B/T160L power/output tube is a well-known and popular choice for audiophiles looking for high-quality sound in their equipment. Here I show the repair and modifications on another Ameritron Al-811hEnjoy 12 hours ago · Penta Laboratories replacement vacuum tubes, radio tubes, triodes, diodes, tetrodes, and more at DX Engineering 572B Vacuum Tube, Power Triode, Direct replacement With 811A tubes, while using CW, FM, or RTTY modes for tuning, always limit transmitting time to no more than 5-seconds transmit with a 15-second cool down. 90 I returned all four tubes. Part Number: PLB-572B-4 5. Won't deliver any more power than the original types in this amplifier. This could be a MOV on the filament winding of the transformer, or a gas protection clamp tube under the sockets Jun 24, 2022 · The 572B is a direct replacement for the 811A but comes with a graphite anode for increased performance and reliability. If the 811A becomes unavailable, three 572B tubes will directly replace the 811A. I still find NOS available and are worth over $200 for the pair. Oct 30, 2021 · A more powerful tube to use in the Collins 30L-1 are the heavy duty 572B. A high grade 572B replacement from Asia has not come forth despite the rumors. This time long before the ARRL international test. ) one large 6A meter protection diode to replace the small OEM diode (or keep as spare) 3. , 572B-TAY-VERT - Transmitting Tube, Taylor (Vertical Mount Only), 572BMP-RFP Transmitting Tube, SELECT Matched Set of 2, RF Parts, SPRCLP-L Spring clip, large. Can be installed in both Horizontal and vertical positions. So, I assume that replacing all three 811A tubes with 572B tubes on the 3-hole AL-811 is fine. More about this upgrade on my website:http://kn6q. The 572B may be used as a direct drop-in replacement in linear amplifiers using the 811A. ) two 3. The tubes in it are a bargain, compared with a ceramic tube. Electrical Characteristics Svetlana 572B Hi-Mu Power Triode Vacuum Tube/Valve - New Old Stock Boxes in new condition Price is per Tube. Ameritron 811a tubesAl ameritron tubes 572b amplifier extra 811 tube 811a ameritron alAmeritron al-811 amplifier – jahnke electronics. Replace power supply diode/cap board with Far Circuits board and new, smaller caps 3. Nov 6, 2023 · Ameritron 383-0800-a7-2 ameritron replacement ceramic tubes Ameritron 380-0500gt ameritron 3-500z replacement power tubes 811a ameritron al 811h tube rf parts hamradio Ameritron 811h tubes 8 Apr 12, 2020 · Ameritron AL811 - I recently installed a set of 3 Cetron 572B tubes into my amp to test performance and compatibility. I mention this as Svetlana removed their 811A from manufacture due to not wanting to market a low profit tube. wmv - YouTube. The only thing that makes those tubes "Taylor" brand is the stamped red logo on the glass envelope. 572B Four Matched Vacuum Tubes, Power Triode, Direct replacement for the 811A, Set of 4 See More Specifications. Introduction The Ameritron AL-811H amplifier is designed for four 811A triode tubes. The replacement's CFM rating above. opF 5. 15 The RF Parts Company Tubes (SELECT) 811A is the best quality 811A tube in current production. Heavy duty components allow for operation at 600 watts continuous output on CW, RTTY, SSTV, FM, and AM operation! The 572B "Taylor" tubes sold by RF Parts are generic chinese tubes, often found on ebay for around $50. As with two unneutralized 572B tubes, three 811A tubes are marginally stable at upper HF. Filament Voltage = 6. Tubes can be visually inspected for obvious faults. + The 572B requires only a few seconds of warm-up time. If mistuned of if there is a load fault of some time that unloads the tank, or if the exciter ha The modern TAYLOR 572B is virtually an exact copy of the original TAYLOR 572B/T160L tube. May 10, 2024 · Refurbished tested 811h nos ameritron tubes amp al updated. Ameritron AL811H converted to AL811HD with 4 x 572B tubes. With the 572B tubes, the amp now puts out around 750 watts. These are brand new Thomson CSF tubes and have proven to date to have excellent performance and really low failure Feb 14, 2024 · Ameritron 380-0811a ameritron 811a replacement power tubes Ameritron 380-0572b ameritron 572b replacement final tubes W8ji ameritron al-811h modification photos & instructions Ameritron, al-811, amplifiers hf tube, al811 Jun 17, 2012 · I would replace the tubes with the larger 572B. The 572B has a much more robust anode design so can stand higher power outputs for longer periods without the risk of anode meltdown/short circuit. COMMON TUBE FAILURES AND TUBE REPLACEMENT IN THE SB200. I would be suspicious of something in the power supply causing a drop in plate voltage but it must be awfully low The 572B is used by many devices like Taylor, Ameritron, Mohawk,Heathkit SB-200, KB3TTP 800+ WATT LINEAR AMPLIFIER and many more. Tubes over 10kV breakdown without glowing ceramic or heavy plasma can be considered good. Here I show the repair and modification of a Ameritron Al-811h 572b TubesEnjoy 572B-TAY-VERT - Transmitting Tube, Taylor (Vertical Mount Only), 572B-TAY - Transmitting Tube, Taylor, 572BMQ-TAY- Matched Quad Taylor 572b Tubes, 572BMP-TAY - Matched Pair of Taylor 572b Tubes, 572BM3-TAY - Matched Set of 3 Taylor Tubes, Cetron 572B / T160L Ham Radio Amplifier Tube. ) 10-ohm 9-watt CCS 10,000 volt rated fault resistor to reduce arc currents New Listing 572B electron tube Vacuum Tube power radio valve tubes brand new 2 pcs. 3V Current 4 A Amplification factor (average) 170 Try removing all tubes, then insert tubes one in at a time, to find bad tube; Tube has or had an internal arc from gas or air leakage If a tube arced, a filament circuit component may have shorted to the chassis. One feature of vacuum tubes is the "getter". The AL811 tube is a descendent of the 812 tube. They are a direct drop in replacement, and according to Ameritron, it is that simple. Tube 572B or Röhre 572B ID6385, Transmitting Triode, air cooled, and shown. Thomson-CSF 572B transmitting tubes. All tubes are visually inspected and 100% tested in a high power, high voltage, dynamic tester. ELECTRON TUBES FOR INDUSTRY 572B POWER TRIODE The Penta Laboratories is a power triode designed for use as a RF Oscillator, RF Power Amplifier and audio frequency modulator. Four 572B tubes give you m Mar 11, 2007 · 572B is a lot more rugged, and generally is a drop in replacement for 811A. Problem was that when I got the them, one tube, out of the box had a blob of solder floating around in the bottom of the tube. Penta's commitment to excellence begins with design and follows each product all the way through distribution. 572b tubes811 tube repair Diytube. If it is too high the tubes will draw too much current but should still not be damaged. Diameter: 1 3/8" Height: 1 3/8" Hole Size: 0. After my set of Shuguang tubes that I purchased for this project failed in early 2016 I bought a matched pair of the new tubes from RF Parts. Penta Labs matched vacuum tubes go Users should increase airflow if extending duty cycle with 572B tubes substituting for 811A tube. Instead of a 5 second tune up time and 600-watt PEP output limit, the 572B can stand much longer tune up time and higher output as well, Collins rated the 30L-1 at 1KW input that at 60% efficiency is 600 watts out. I separate 572B tubes by voltage breakdown and color of gas plasma. Making use of expensive 572B tubes from China and left over 572B Svetlana stocks are reliable with the 811A amplifier applied high voltage. Custom Cables Built, Tested and Shipped FAST! 4 Easy Steps! 572B tubes readily available for less than $100 a pair, too. The project started as a retrofit of the Clipperton with GI-7B tubes. Tested with my tv7 tube tester Ones that hadn’t failed due to whatever issue occurred . 811A tube 572B tube history. ) one 100k 2-watt resistor 4. , 4 The 572B is a direct replacement for the 811A, but has a Graphite Anode for increased performance and reliability. Ameritron AL-811HD amplifiers, with four rugged 572B tubes, give you 800 watts PEP output for that extra punch needed when 100 watt transceivers just aren't enough to be heard. One way to tell a tube is bad is to put it in a tube tester. "Made in China" $163. incl VAT: £ 180. 36 EACH IMPORTANT: Do not substitute on the 175P style resistor. So far they perform well providing about 600 watts of output. They are also common in a wide range of vintage RF amplifiers. C $150. The 572B is a replacement valve for the 811 transmitting tube. 572b 811a tube tubes amplifier w8ji reasonably filament assume assembly grid problem since same also use they modification 811 811a 572b Electron 811a. The 811A tubes are hit & miss. Tube repair volts load specs amp call811a hifi psvane tested 1pc fu amplifier triode vacuum 811a 572b 3-500z vacuum tubes for sale – ctr engineering, inc572b tubes. RF parts gave me grief about a replacement tube. Tubes with 8kV breakdown that have heavy violet or purple glow originating in streamers from sharp metal points can often be aged in. 572B Power Triode Penta Laboratories Matched Pair (2) Tubes The Penta Laboratories 572B is a power triode designed for use as a RF Oscillator, RF Power Amplifier and audio frequency modulator. Install Heathkit SB-220 HV transformer 4. >> > >> > The 572B is taller and wider which might represent a problem >> > (moving the plate caps too close to the metal case or overly >> > restricting air flow between the tubes Cetron 572B are the best tubes money can buy. Used – Good. The tubes last many years and some date back to the 1960s still producing full power output. Typical operating conditions in amateur service are a Va of 2,400 V and an output power from a pair of 400W. 572B Three Matched Vacuum Tubes, Power Triode, Direct replacement for the 811A, Set of 3 See More Specifications. These 572Bs are a modern version of the venerable vacuum tube that has been around for a long, long time. The WATERS tube first showed up in the Heathkit SB200 amplifier c. com. New Current Production ** No returns, however Defective Tubes will be replaced free of charge for 13 months** COMMON TUBE FAILURES AND TUBE REPLACEMENT IN THE SB200. Radio tubes are valves. Aging or Degassing Tubes Jan 8, 2024 · Here I show the Repair And mods on Another Ameritrom Al-811hEnjoy I have an AL-811H and use the 572B tubes. I have 2 other tube amplifiers, and 1 solid state amplifier, but my AL-572 is definitely my favorite amplifier. Tuned Input: A Pi-Network tuned input matches the 572B tubes to 50 ohm exciters. Also the plate rating is up to 160w vs the 811A's 65w rating. OZ2BKK Rating: 2010-03-07; Dec. Electrical Filament: Thoriated-tungsten Voltage (AC or DC) 6. power after repl. Replacement tubes (valves): Since both tubes blew up when the amplifier failed I had to find a replacement. Stability problems and arcing problems are unrelated!. Replace 4, 572B tubes with 2, GI-7B tubes 2. With the original 811 tubes in the amp, it usually put out around 650 watts. Shop Amplifier Replacement Parts at DX Engineering. However, the more I worked on it the more changes I made. Looking online my only option was to either find a set of original “old” tubes or to buy a pair of new Chinese ones. New. I replaced the 811 tubes with a set of new 572Bs. View similar gear from other sellers on Find Penta Labs RF Vacuum Tubes and get Free Shipping on Most Orders Over $99 at DX Engineering! Penta Laboratories was founded in 1951 and is a world-class manufacturer and distributor of a wide range of vacuum tubes for a variety of industries. Examples are the KW1000 and Yaesu FL2100. 08 inches of backpressure must be compared to the AL811's rated flow at 18 CFM. 572/811 Single-ended Anniversary - Thivanlabs. Check Details Check Details. I would limit the amp with 811A tubes to 450 watts PEP output unless using 572B tubes. Base indexed and internal structure aligned and supported for both horizontal and vertical operation. While you should NOT run more output, duty cycle can be greatly increased without hurting tube life. Harbach makes a drop-in replacement kit that actually improves on the original. 1964. Check These are the high voltage filter capacitors, which will need replacement: This is a bottom view, with cover removed: Tube ceramic sockets are also on pretty nice condition: More nice looking components: This is the diode board: This power resistor is dated year 1968, week 22, when I was about two weeks old! I separate 572B tubes by voltage breakdown and color of gas plasma. They were packed very very well and there wasn't a scratch on them. All Items located in Sydney for delivery or pickup. I have just replaced the two old 572B tubes of my Heatkit SB-200 PA. Here is a summary: 1. Four rugged 572B tubes give you near legal limit power Dec 10, 2023 · The 811A tubes cost about $20 each. Apr 5, 2005 · With 1800 volts and 500mA plate current those 572B's should show no color on the plates whatsoever under keydown conditions. These high-quality tubes will serve as direct replacements in any 572B RF amplifier or modulator and are ideal for upgrades. I tried to clean the tube from fingerprints with alcohol and it wiped the tube clean - literaly. Reactions: Captain Kilowatt The Penta Laboratories 572B is a power triode designed for use as a RF Oscillator, Amateur Radio RF Power Amplifiers and Audio Frequency Modulator. The 811A plate is much more fragile than the 572B, just pay attention during tune up. The 572B can handle up to 2400v plate, vs 1500v for the 811. The tube to the left is in my high voltage test fixture. + The AL-572 uses rugged inexpensive 572B tubes. DX Engineering offers a selection of Penta Labs single and matched sets of RF vacuum tubes and ceramic vacuum tubes for your electronics project or repair. . Check Details Find many great new & used options and get the best deals for Yaesu FL2100 Linear Amplifier 2 X 572b Tubes at the best online prices at eBay! Free shipping for many products! respect to the base pins to avoid internal shorts in equipment designed for horizontal tube mounting. 5 Available. The tubes came in 3 days and were in perfect shape. New tubes 6. The 811A is pretty fragile in this kind of amplifier, easily damaged by mistuning, excessive drive power or high SWR. An exception to this would be the Svetlana 572B (the real Svetlana, now SED) which is sometimes not a drop in replacement in some circuits (Yaesu FL2100B comes to mind). Overall a nice piece of equipment. As Ed said,check the bias. Later I installed an SS-100-240 Universal Soft-Sta Replacement Aluminum Plate Cap / Anode Heat Radiator for 304TL, 304TH, or tubes having 0. Supplied with matching data and warranty card. 572B Pair Matched Vacuum Tubes, Power Triode, Direct replacement for the 811A, Set of 2 See More Specifications. The Svetlana 572B may be used as a direct drop-in replacement in equipment designed for the 81 IA, T160L or 572B. Jun 7, 2021 · The last 811 tubes I bought years ago from RF Parts were new old stock RCA JAN tubes. Dec 1, 2014 · The first 572B was made by United Electronics for a company called “Waters Manufacturing”. The weak point is anode heat, and heat is a function of duty cycle and anode dissipation. Ideally any new fan would flow 35 CFM at about 0. The 572B is a direct replacement for the 811A, but has a graphite anode for increased performance and reliability. 811A 572B 3-500Z Vacuum Tubes For Sale – CTR Engineering, Inc. Price excl VAT: £ 150. Under their strict requirements a tube was made that according to them was at least as good as the former Cetron tubes made before 1990. 2. 9 0. This piece of gear has sold. These are Vintage unitsplease do not expect it to look like or necessarily Four fully neutralized rugged 572B tubes give you near legal limit power and instant 3-second warm-up time. 811a psvane transmitterCircuit shishido amplifier valve 811a amplifiers 1pc psvane 811a vacuum tube tested replace 811 fu-811 for hifi The 572B tubes used in the SB-200 have been out of USA production for many years, and then Russian and more recently Chinese variants have been available. This can destabilize amplifiers at upper HF. I didn`t find the 811A datasheet but the svetlana is suppose to be a direct remplacement of the original 811A. Oct 24, 2016 · In 2015 RF parts found another Chinese company to make the 572B tubes. ) three application tested GDT tubes 2. The 572Bs are venerable vacuum tubes that have been around since 1961 and have proven themselves in all kinds of amateur, commercial, and military service. Mar 1, 2024 · Al ameritron 811 amplifier linear fuse hf modNos refurbished 811h ameritron tubes tested amp al Ameritron al-811 600w hf linear amplifierAmeritron 383-0800-a7-2 ameritron replacement ceramic tubes. The result is cooler operation and longer component life. The replacement 572B that I received from China seems to have a loose anode cap, that needed resoldering. The single largest problem with the AL811 amps is tubes. Tube 811a 572b vacuum anode. Sep 7, 2010 · One was a 6CG7, the filament opened. All Penta Laboratories tubes are burned in before testing and matching at their Testing Facility in Ventura, California. 3b/ 170 6. The COMMON TUBE FAILURES AND TUBE REPLACEMENT IN THE SB200. Although the AL-811H is rated at 800 watts PEP out, the rating is over the 811A recommend output. Check Details Tube 811a 572b vacuum anode The 572B tube. 811a four tubes set 2a3 / 300b / 811 / 572 572b finals ameritron dxsupply. 0 out of 5 stars These tubes will serve as replacements in any 572B amplifier. 3 V ± 0. 811a tube 572b tube historyTube repair volts load specs amp call 1pc psvane hifi 811a triode vacuum tube tested replace 811 fu-811a forTubes 572b inspected soldering. I think it needs a bigger transformer to supply Aug 31, 2004 · HI I plan to possibly use the 811A in an amplifier. All products manufactured by DX Engineering are warranted to be free from defects in material and workmanship for a period of one (1) year from date of shipment. Read honest and unbiased product reviews from our users. We offer the highest quality 811A, 572B, and 3-500 tubes. Reliability will be enhanced by the upgraded overload capability of this rugged graphite plate tube. Ameritron 572b replacement final tubes 380-0572b Feb 26, 2016 · Repair on a Ameritron 3- tube 811 that someone converted to a 4- 572B. Check Details. AL 811 AMP Changing Tubes. 1400 V). The 572B is a direct replacement for the 811A, but has a Graphite Anode for increased performance and reliability. Long Tube Life: The 572B tubes are long life, reliable transmitting tubes. Price is for a Single Tube. In most applications these can also be used as a direct replacement for the 811A. The tube was not clearing the load cap. amplifiers, these 572B tubes are a modern manufacturing version of the vacuum tube that has been around for a long time. Common Failures. This article examines the performance of the Ameritron AL-811H amplifier with the supplied 811A tubes and with 572B tubes, and details a procedure for replacement of existing tubes. 812 Tube. I would limit to 700 watts CW and 500 watts RTTY with 572B tubes. The modern TAYLOR 572B is virtually an exact copy of the original TAYLOR 572B/T160L tube. 572B Tubes- China Manu. The other tube was a 6AQ5 that was running with the plate voltage almost 100 volts over tube chart max. The RF Parts Brand 572B was designed similar to old Cetron version 572B. With the 572Bs you will never melt the tube plates with overdriving or using high duty modes such as CW, RTTY or AM. The FL-2100B is know for it's reliability, using rugged 572B amplifier tubes, high quality The 572B is a replacement valve for the 811 transmitting tube. Now to put them in the amp and see how they preform. Usage tests show it to be equal to the much-respected RCA, 811A and Svetlana, 811A. Recommend you install the Harbach mods - soft start and replace the filter caps, plus the bigger fan and definitely the soft keying mod (the sb200 keys by taking approx 150VDC to ground, which is not compatible with modern exciters). Over 10 years, I have never had any problems finding reliable 572B tubes at a reasonable price. New design 572B with Ceramic base, Gold pins, and Heavy Duty Plate. By Merit Arnold W6NQ November 13, 2014 The first 572B was made by United Electronics for a company called “Waters Manufacturing”. tkehl oqgevt hhl ygwkiea sjeodf rtbc bsj pfv smikmni hgdkf