Schematic: Audio Innovations, The first audio amplifier - Page 3

maartentje · 26th March 2009, 08:15 PM

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

tubino · 25th February 2010, 01:24 AM

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???

kavermei · 25th February 2010, 06:34 AM

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

25th February 2010, 06:34 AM	#23
kavermei diyAudio Member Join Date: Jan 2005 Location: Lokeren, Belgium	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 __________________ Never send a human to do a machine's job. --Agent Smith

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26th March 2009, 08:15 PM	#21
maartentje diyAudio Member Join Date: Jun 2002 Location: USA, FL	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

25th February 2010, 01:24 AM	#22
tubino diyAudio Member Join Date: Mar 2005 Location: Toledo, OH USA	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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