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Jim, You might need to add about 10pF off of the cathode pin(s). Do you have a VNA? They are swell gear to expose tuning glitches. Hal W4HBM

The position of the slug tell you a big story. ?Ultimately you would?want the slug to Bering inside of the coil windings when the SWR dips the lowest. ?That would indicate there’s enough of

I'm working on a used AL-811 for a friend. The 811 tubes were bad, so I replaced them with some Penta Labs 572b tubes (A whole another adventure). I also replaced the tube sockets, and installed GDTs

Hello, Has anyone had to replace the vernier drive on the load control of any of the Ameritron AL series amplifiers? Thanks & 73, Garry - K4OR

Ahh yes.? Aerotron used the 5894 in their base stations along with the 6360 in their "lunch boxes".? IIRC, somewhere along the line they used the 8643 also. Andy? K9ATX

Amperex had a tube lineup, mostly 9 and 11 pin receiving miniatures that were serviceable, but they were out of their league when pushing RF Power. (For a minute I confused "Amperex" with

Amperex had roughly half a dozen of these push-pull tetrode types in their product line back in the day, probably all targeted for the VHF/UHF land mobile radio services. All were single-ended input,

" The comment in the blurb about frequent replacement of the tetrode finals make me wonder if the designers were Tetrode Men." Yes, it's easy to imagine that development lab had some "politics"

Tuesday, April 29, 2025; 0944EDT (UTC-5) Dear Tim, The comment in the blurb about frequent replacement of the tetrode finals make me wonder if the designers were Tetrode Men. I'm struggling with

Tuesday (Mardi),29 April 2025; 0940 EDT (UTC-5) Dear Francois, An excellent piece of research! "C'est un fabrication ancienne..." Your comments are so well received here. Hal Mandel W4HBM

Seems very likely the site used this Pye T30AM/FM set in the 1960's 1970's. They used QQE0312 final stage and the former Pye engineers forum says these were well known for needing final tube

drive it till you get 500-600 ma...using the lower B+? ?(CW) position.? ?Then you will get your desired PO.

1770 vdc loaded @ 565 ma = 1 kw DC input = 625 watts output.? ?600 watts out on upper HF freqs like 15+10m.

The RFparts pictures show 6360 Its an equivalent of QQE0312

I think you've nailed it :-) The RFparts pictures show 6360's have very distinctive internal structure matching my pictures Many thanks Tim

His problem is he's using the WRONG B+ position. He should be using the lower 1900 vdc ( CW position). That will give him an easy 600+ watts pep out on ssb / 600+ watts CW / Data /

Nonsense.? ?I use 10 x 1N5408's in series for bias. ( aprx 7.2 vdc) .? Idle is 100 ma on? 2650 vdc position............? and just 40 ma idle on lower 1900 vdc position.? ?IMD is superb with

Answers to various questions This is an amplifier I bought that had seen little use. When I baked the tubes as a precaution to degas them, using a low voltage, high current, and therefore a

Or run a pair of cheaper 4-250"s.

Hoping I don't get beat up for this question. If all you need or can have is 500 watts would it be better running one tube?