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" 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" that

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 / FT-8. just 40 ma

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 positive

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?

Your tubes are dead? 73, Alek VK6APK.

An increase in anode current increases the negative feedback action of a grounded grid amplifier. Gain is also effected by the efficiency of the input and output circuits, 73 Peter, DJ7WW _____ From:

You increase the output power by increasing the drive power. The anode pi circuit is designed for about 1200W output at 2.5kV plate voltage. That output is typical for L4B and L7 amplifiers. 73 Peter

They look like 6360s, 10 watt push/pull VHF PA tubes. I can’t be certain, though. QQE0312 ? -- F1AMM Fran?ois De la part de Mahlon Haunschild - N4ZK via groups.io Envoyé : lundi 28 avril 2025

Oh, gosh! Poor babies! Hal Mandel W4HBM

They look like 6360s, 10 watt push/pull VHF PA tubes. I can’t be certain, though. Best regards Mahlon - N4ZK [email protected]> wrote:

These tubes were literally dug up last weekend at a former "VHF Telegraphy" commercial site in the UK. Does anyone recognise what they are ? Ideally I'd like to know what equipment they were used in,