Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
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The 41-280 is push-pull, with the LOUSIEST phase inverter circuit ever used (but it saved one tube...). But that's typically Philco - they always did things their own way.
Threaded Mode