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In Reply to: RE: Going to larger OPT for my SET??? posted by greg7 on October 19, 2014 at 09:29:23
Primary inductance may be one aspect but what about copper losses and all those other lovely caveats which apply to audio transformers ? Do you really need a 30 watt transformer anyway ? I would do some research based on the published numbers such as primary/secondary DCR , number of sections , primary inductance and core material . My own recommendation would be to find a transformer with at least 20H per 1k of Ra (for triodes) and a single secondary which ideally suits your speakers rather than 16/8/4 ohm taps etc...
Al
Follow Ups:
"...find a transformer with at least 20H per 1k of Ra..."[edited Oct 20 2014: I misinterpreted Ra so the following comment is not relevant - see retraction below.]
Good luck with that! The biggest I know of is the Magnequest FS-030 which gets 35 henries at 60mA max, with a 3000 ohm primary.
Edits: 10/20/14
I was talking Ra nor Rl . Should be easily do-able :)
Al
Yes, that much is quite reasonable - 15 henries more or less for 2A3 and 300B.
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