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In Reply to: RE: Losses in Output Transformers posted by Paul Joppa on September 16, 2021 at 18:01:00:
Yes, small differences can add up, but I wasn't expecting to see the full 50W. The original spec for the amplifier using this iron was 35W RMS output, and that's relative to even lower voltages. The original circuit only indicates +420V on the CTs and +410V on the anodes, and that's at idle. The higher numbers I posted were measured at full output after the supply sags.
In addition to the original specifications, I've searched for other analogous operating conditions. Several manufacturers show 6L6 variants operating in AB1 at lower voltages than this producing more than 35W. The RCA 807 sheet shows +400V anode / +300V screen into a 6.8K load will deliver 36W. The Sylvania 7591 shows +400V anode / +350V screen into 6.6K will deliver 37W. Are these theoretical numbers? Do they include the losses of test transformers? I don't know, but the amp on my bench is operating at higher plate voltages than this, and I expected to see more.
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Follow Ups
- RE: Losses in Output Transformers - Triode_Kingdom 09/16/2118:53:35 09/16/21 (4)
- And there's this... - Triode_Kingdom 00:46:09 09/17/21 (3)
- this may help - elblanco 17:14:37 09/18/21 (2)
- Thanks! - Triode_Kingdom 21:46:10 09/18/21 (1)
- RE: Thanks! - elblanco 15:38:39 09/19/21 (0)
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