Hi Mauro,
Fred Hammond used to tell me that the transformers they made were derated upwards of 50%. You may want to give the techs a call and see if the smaller transformer (125E) that fit better will handle the output of a Class A (AB?-Jay?) pair of 6L6Gs.
The output is conditional on the B+, not the tube bulb style (maximum heat dissipation issues in the metal tube), if the original amp was 310VDC at the plate - that would make it around 18W output based on my GE Tube book from 1964 if operated as Class AB(1), 47W if operated at AB(2) which I really doubt, and I don't know how to tell anyway.
My RCA book lists the 6L6G, run Push-Pull at 270VDC in Class A, is rated at 18.5W @ 134ma, P-P 360VDC Class AB(1) is rated at 26.5W.
John :-#)#
On 2025-12-03 11:46 a.m., M De Simone via Jukebox-list wrote:
Jay, I missed the 1760 series on the website, thanks for pointing them out. I really like the 1760JB as a replacement but it’s going to be a very tight fit. The top of the transformer will be touching the bottom plate and the core will be tight up against the relay but I’m very confident I can tuck it in there. Thank you for your research and recommendation, as always you really helped me out. I think this is the right choice! Appreciated, Mauro
Sent from my iPhone
On Dec 2, 2025, at 11:18 PM, Jay Hennigan via Jukebox-list jukebox-list@lists.netlojix.com wrote:
The 1760J is another possibility. Rated at 40W, seems closer to your dimensions. The 2.63 inch height might be an issue. See also 1760JB.
https://www.hammfg.com/files/parts/pdf/1760J.pdf
https://www.hammfg.com/files/parts/pdf/1760JB.pdf
-- Jay Hennigan - jay@west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV
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