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RE: Eimac tetrode verses pentode in triode conection.

I don't know what switchmode supplies will sound like but filament supplies are what makes all the difference with these big spiral filament , spiral grid thoriated types . AC is definitely out . I used DC LCLCL supplies which is probably the main reason why I never managed to get past the breadboard stage . I think you are making the right move with 4-65A , filament requirements are less , Ra as triode is lower (1.6k) and sockets are no issue . You may need to find some heat dissipator caps though . Look up Ale Moglia's blog (Bartola Valves) , he has a 4-65A amp on the go at the moment

Al

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