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Old 26th March 2009, 08:15 PM   #21
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Hi Guys,

guyser realy thnx for the schematics helps me alot!
I think when i look at the pictures from diyparadiso its the parallel version. Do you have some pictures from the inside of an orginal 2a3?

Thnx a lot

Maarten
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Old 25th February 2010, 01:24 AM   #22
tubino is offline tubino  United States
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Hi, I just stumbled this as I'm resurrecting a long-dormant Audio Innovations First. Can someone explain to me why the path to ground from filamentary cathode is so DIFFERENT for the two halves of each PP pair in this amp? Each pair of tubes has one with 39R resistors from each end of the filament joining then to cathode resistor, while the other half of each pair has a 50R pot with wiper to cathode resistor.

What is up with that???
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Old 25th February 2010, 06:34 AM   #23
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It's sufficient to make the hum amplitude in the one tube equal to the hum in the other. The hum will then cancel out in the output transformer.

Kenneth
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