Tuning A Linear Amplifier 3-500zg 811A 572B Triodes in Grounded Grid For Maximum Output Power W6LG
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Published 2022-11-01
All Comments (19)
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You and I were both in the pileup with the Kuwait station over the weekend, It was cool to hear you. Hope you got him! 73
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Perfect timing for me seeing this video. Really enjoyed the qso with you. My prayers are with you K7ZDP. Dave
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Excellent! Doing it that way for many years. I have a Drake L7. Got it used in about 1990 and still using the same tubes after 22 years! I do keep the output under 1000 watts most of the time, but it gets a lot of contest use.
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Gosh Jim, I did this same thing on USS Carl Vinson CVN 70. Replaced all that z700 tubes. Had NIViking tuners. Stole "2" 35 ft horizontally polarized winps off the stern of the aircraft carrier... Put out1500 watts pep. And touched the Earth with RF!!! I'm not a radio man I'm just a ham BM1.... Knuckle dragger....
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Another well done video.
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Hello Jim. Geat to see and hear you again. Awesome video as always. I picked up a couple of Kenrich Eagle 10 meter amps that used sweep tubes. I'm putting two GI-7B Russian tubes in one and GI-46B in the other and installing an ATU instead if a band switch in them. Fun projects. I just ordered a pair of 813 tubes and will be my next project. All the best sir. Still in my prayers. 73
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Thanks for the informative video. This answered a few questions I had. Nice Job.
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Have had an 811H amp. for a year now. After about 5 hours of use I had one tube fail sent it back to Ameritron they said the tube had lost it's vacuum in the base. Sent me a new one and so far all doing fine. It came with the grid current protection circuit so I can only load it up to 50 watts and no more but I do get 800 watts PeP out with it and so far am very happy that I have a good signal without spending $5K or more.
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Thanks. More videos brain-dumping your knowledge on linear amplifiers, please.
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I just rebuilt a Gonset 101 with four 811A's. I greatly appreciate this video for showing me how to tune it up. It works great. I have both a Tiny SA Spectrum Analyzer and a Nano VNA and it is showing a very clean output.
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Thanks Jim
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Would this method apply to the Kenwood TL-922A ?
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Jim, I really appreciate this video, especially now when I've got a line on a 4b. The seller bought an estate and this was part of it. He's asking about $1200 and states it was working before the operator went SK. Given, the triodes may be dead or tired, However, my question-most likely too big to answer-is what or where should I look to assure that the amp has still some value. As usual, your videos are a joy and so informative. 73 OM. AA7MO, Mike
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Do you tune in CW on the SSB position or is it another type of carrier?
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I thought you were suppose to tune with a pulsed carrier ?? I think it’s supposed to lower the duty cycle and be easier on the tubes ?? I feel teaching solid carrier could be detrimental to sum tubes that are made of inubtaninium
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On my homebrew 813 amp I have a center zero phase meter .
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Thank You Sir Good Tech.
