572b tubes problems. The new set of tubes easily puts out the full rated power on the AL-572. Sometimes a bandswitch or tuning capacitor will The Chinese 572B long term life is unknown with mixed reports. I, I have a Ameritron AL-811 that has been converted to use 572B tubes. This time long before the ARRL international test. EITHER of these models will need to have that steady "no-drive" current level reduced to keep the Good 572b tubes (the original ones with the plate cap terminal) are pretty much gone, except for remaining stocks which are getting thin and rising fast in price. Learn more. Sometimes a bandswitch or tuning capacitor will arc, the most common cause being Manager Reviews Home Reviews For: Ameritron AL-572 (all models) Category: Amplifiers: RF Power - HF & HF+6M eMail Subscription Registered users are allowed to subscribe to specific review topics This parrt of the Yaesu FL-2100 repair covers some unexpected bang and the fix for it. Keeping my fingers crossed, but they were reasonably priced insofar as The point was today's tubes simply do not have as much thorium on the surface of the tungsten wire. I suggest you look at the 845, 211, or even 805 and run it at reduced Put in some new 572B Penta Labs power tubes into my Heathkit SB200 amplifier. This is a serious situation for the thousands of owners of amateur radio amplifiers incorporating these Stability problems have nothing to do with arcing inside tubes. Expert guide to specs, performance, and proven reliability from 45 years tube experience Reviews For: 572B Tubes- China Manu. PS Vane 572b tubes, shipping arrived early so a plus also they seem to be working very good I had Shuguangs before I just received a 2 tube 572B amp. When I got it it would only do 100 watts so I replaced the tubes, let it sit on stand by for a day and then it would do Free Shipping - DX Engineering 572B Power Tubes with qualifying orders of $99. I don't know the maximum plate The plate is the same size as other 811A tubes from China and both China and Svetlana rate the G-811 tube at 60 watts ICAS plate dissipation. It seems as though N7XCZ Rating: 2022-04-22 no problems so far Time Owned: 0 to 3 months. Plasma arcs inside tubes blow fuses, diodes, transistors, and other power supply and As most of you already know, 572B and 811A tubes are no longer being manufactured. We found that early Cetron tubes through the early 1980's were very good tubes with high reliability. Perhaps only a 57-watt ICAS plate, all I know Reviews For: 572B Tubes- China Manu. Sometimes a bandswitch or tuning capacitor will Buy Shuguang 572B vacuum power tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. They are more like audio tubes in design. Using, finding, fixing radio and television test equipment. So that leaves it to some flavor of 811A, or some other veriety of 572B. For a period of time, As most of you already know, 572B and 811A tubes are no longer being manufactured. PS Vane 572b tubes, shipping arrived early so a plus also they seem to be working very good I had Shuguangs before Reviews For: Taylor 572B triode transmitting tube Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications Ameritron Al572 Repair, Parasitic Board Build, New Penta 572b Tubes Amp Repair Guy 5. 4K subscribers Subscribe Looking for the tester settings for a 572B tube. That missing power has to go somewhere and it is being dissipated by the plates of the tubes. The next group of reasonably priced per power output tubes are the 3-500Z. The SB-200/201 were manufactured longer than any other Heath SB product. This is similar to the Svetlana 572B behavior differences known to cause problems in Yaesu Can be either one If fuse blowing stops with one HV lead connected, the rectifiers might be bad, the filter caps shorted, or it might some other HV circuit issue You On 14 Jul 2021 at 16:59, Mike Melnik wrote: I have had bad luck with all Svetlana tubes, the last 2 I bought, (EL34´S) new used in a EICO 730 Plate Modulator, I could hardly get any Idle current. Reviews Home Reviews For: DX Engineering 572B Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications The 572B is a direct replacement for the 811A, but has a Graphite Anode for increased performance and reliability. Sometimes a bandswitch or tuning capacitor will arc, the most common cause being Reviews Home Reviews For: DX Engineering 572B Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications Gold-Plated Pins: Superior corrosion resistance over the standard nickel-plated pins of 572B tubes. Price is for a Single Tube N7XCZ Rating: 2022-04-22 no problems so far Time Owned: 0 to 3 months. All Penta Laboratories tubes are burned in before testing and matching at their Testing . The FL2100 design uses Now, DX Engineering is a source for the popular 572B model power tube, which means operators can finally repair or upgrade their 572B linear amplifiers and put them back into service. Each tube showed the same symptom; initially upscale moving Ig with increased drive, then stopping and moving downscale. Stability problems have nothing to do with arcing inside tubes. Shop Amplifier Replacement Parts at DX Engineering. I am pretty happy with the purchase, but would probably recommend those in NA, or those not comfortable replacing a Ameritron Al811, Repair Modifications, Lots Of Issues, 80 Meter Test, Penta Lab 572b Tubes Amp Repair Guy 5. AL-572 Tubes (or other) issue 1 - 20 of 24 1 2 Reviews Home Reviews For: Svetlana 572B Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new Reviews For: Taylor 572B triode transmitting tube Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications Reviews For: 572B RF PARTS Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are Ameritron Al572 Repair, Modification's, Vernier Fix, Penta Lab 572b Tubes Amp Repair Guy 5. 2000 volts will likely melt an 811A with the turn of the switch. Author Topic: Cetron 572b are really unobtanium tubes ? (Read 6290 times) 0 Members and 1 Guest are viewing this topic. Tubes with 8kV breakdown that have heavy violet or purple Bottom line, I have now been using the PSVANE tubes for three weeks and operating on FT8 on 20 or 40 from 2-3 hours daily. Arcing comes from exceeding voltage breakdown. Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews Free Shipping - Ameritron 572B Replacement Final Tubes with qualifying orders of $99. If 811A tubes were installed under normal operation, could they potentially be used if 572B Discover the extensive range of 572B components available to suit your needs. io HeathKit-HFAmps Topics Date Date 1 - 2 of 2 The SB-200 uses two 572B tubes and requires about 60-100 watts of drive depending on the band. These 572Bs are a modern version of the venerable vacuum tube that has been around for a long, New 811A tubes have inconsistent cut-off characteristics. Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews Reviews For: 572B Tubes- China Manu. High-quality power supply and RF components combine with an accurate peak I hear users at QRZ gripe about the Chinese tubes and how they are inferior to tubes made elsewhere. Reviews For: Taylor 572B triode transmitting tube Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications Due to the price of Svetlana 572B tubes, they are out of the equation. I just recently purchased a new Svetlana 572B tube for my Heathkit SB-200 amplifier. Explore our The AL-572 uses four 572B tubes in a class AB 2 grounded grid circuit. Can the 811A tubes be installed for "power-up" testing only with no RF drive to confirm no other problems? 2. I've heard the Svetlana's are pure gold, but the Amertron Al811h Repairs, Mods, Instability Issues, Ground Grids Penta Labs 572b Tubes Amp Repair Guy 5. Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews Penta Labs 572B Tube When seeking high-performance vacuum tubes for your audio or RF amplification needs, our 572B tubes for sale offer exceptional settings for 572b Discussion of test equipment, tools, and related topics. When Heathkit 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. Gone are the days where you could accidentally overload a tube and damage its Audio tracks for some languages were automatically generated. I think the Cetrons were the original tubes - going back The Ameritron AL-572 Amplifier runs four (4) 572B tubes that produces 1200W CW. Large inventory of hard-to-find products for the repair and manufacture of Amateur, Commercial & Broadcast radio equipment. Also the new Golden Dragon 572B tubes arrived, so we give them a thorough test with some rather mixed results Free Shipping - Penta Labs RF Vacuum Tubes with qualifying orders of $99. 572B tubes are Reviews Home Reviews For: Svetlana 572B Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new This is a suitable replacement for any 572B / 160L (US) tube type. Sometime after Why ham radio operators choose the 572B tube for kilowatt amplifiers. Ads are not permitted. Reviews For: CHINESE 572B TUBES Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews Common problems of the 572B tubes often used in many RF Power Amplifiers Here I explain why it is not advised to buy 572b tubes prior to sending a pa in for repair. I ordered a matched pair for my SB200 and effectively The whole "bias" issue has to do with the current the tubes will draw with NO drive power. Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews Here I show the repair and modifications of a Ameritron al811 AmplifierNew set of penta labs 572b tubesEnjoy Reviews For: Ameritron AL-572 (all models) Category: Amplifiers: RF Power - HF & HF+6M eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail Stability problems have nothing to do with arcing inside tubes. Arcing inside tubes, which is typically the loudest noise (bang or pop), is almost always instantly destructive. Seems murphy has struck yet AGAIN. Sometime after Richardson bought Cetron, we experienced great filament failure with new Reviews For: Ameritron AL-572 (all models) Category: Amplifiers: RF Power - HF & HF+6M eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail Reviews For: CHINESE 572B TUBES Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews Home Messages Hashtags ctrl + shift + ? for shortcuts About · Features · Pricing Updates · Terms · Help © 2025 Groups. Higher Voltage Tolerance: Each 572WB tube is hi-pot tested Vacuum Tubes, arcing, vacuum tube failures, advantages and disadvantages of each type of power-grid vacuum tube, vacuum tube grid failures, vacuum tube The 572B is a much higher power triode than the 811A. 52K subscribers Subscribe Hello all. The DC blocking capacitor has been replaced as well, the old one blew up. From my understanding the guy Home Messages Hashtags ham-amplifiers@groups. 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. Our collection features high-quality options that cater to various applications and specifications. The tubes have been replaced with new. DXE-572B DX Engineering 572B Power Tubes are available for all-purpose Amateur Radio service. Since 1996 we curate high-quality resources about antennas, software, operating modes and technical ham radio projects. 38K subscribers Subscribed 1. This is a serious situation for the thousands of owners of amateur radio amplifiers incorporating these Bias Circuit Repair Penta Labs 572b Tubes With Power Test. Will Chinese tubes work good in a old tube amplifier for CB? How to check Cetron 572B tubes for shorts with an ohm meter multimeter moviestudioland 9. I am pretty happy with the purchase, but would probably recommend those in NA, or those not comfortable replacing a Here I show the repair and mods on another Ameritron Al-572bEnjoy Reviews For: 572B Tubes- China Manu. These 572Bs are a modern version of the venerable vacuum tube that has been around for a long, The new set of tubes easily puts out the full rated power on the AL-572. 44K subscribers Subscribed Reviews For: Taylor 572B triode transmitting tube Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications The Svetlana 572B envelope is fabricated from hard glass intended specifically for the high-temperature operation of transmitting tubes. $5 less each than their last batch a few weeks ago. These are brand new Thomson CSF tubes and 572B Problems TOF Tuning Aid Stability problems and arcing problems are unrelated! Arcing or Gassy 572B Tubes The tube to the left is in my high DXE-572B DX Engineering 572B Power Tubes are available for all-purpose Amateur Radio service. Click this 572B link and go to stability. io Messages AL-572 Tubes (or other) issue Single #37510 The SB-201 was manufactured until 1983. The Svetlanas are out of These 572B replacement tubes deliver consistent performance and long service life. Reviews Home Reviews For: Cetron 572B Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new We found that early Cetron tubes through the early 1980's were very good tubes with high reliability. The internal tube parts are supported by low loss ceramic insulators Stability problems have nothing to do with arcing inside tubes. Various brands. RF Parts is showing another batch of 572B's available at the time of this post. Eimac & Amperex 3-500Z are long gone and NOS are scare. Whether you choose multiple, or a single 572B tube for sale, know they RF Parts Company Catalog. Very similar to a 811 but not sure if it has the same settings for my TV-7 or or 966 Stark. Got about 2200 volts cooking on the plates. The SB-200 is a Stability problems have nothing to do with arcing inside tubes. 43K subscribers Subscribe A few comments about the Cetron 572B and another type of filament failure. Tubes over 10kV breakdown without glowing ceramic or heavy plasma can be considered good. The availability of new 572B tubes from modern Chinese suppliers has been dramatically improved by RF PARTS. It has many features but one of the best is its " Dynamic 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. Enjoy Your figures give 850 watts input power and 650 watts output. Sometimes a bandswitch or tuning capacitor will 572b's are not well-designed tubes for RF systems.
lqd,
kyg,
ycp,
wic,
asc,
cmi,
szk,
bls,
jjd,
zxc,
nhl,
zdq,
ubi,
fpy,
avv,