ampex: Ampex stereo amp Mod.-ID = 127920

ID: 194032
This article refers to the model: stereo amp unknown (Ampex; San Carlos, CA)

ampex: Ampex stereo amp Mod.-ID = 127920 
06.Jul.09 03:26
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Jeff Droll (USA)
Articles: 2
Count of Thanks: 7
Jeff Droll

I have the full factory service manual for my Ampex console unit. As soon as I can get it scanned  I'll forward it.

I also replaced the original 6973 tubes with 6GC5's. This required that the original power supply voltage doubler be converted to a full wave bridge. This slightly lowered the output power but cleaned the sound up incredibly. It also has extended the tube life 10 times.

Those changes are noted in the schematic

Jeff

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