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stereo amp unknown

stereo amp unknown; Ampex; San Carlos, (ID = 434442) Ampl/Mixer stereo amp unknown; Ampex; San Carlos, (ID = 434443) Ampl/Mixer
stereo amp unknown; Ampex; San Carlos, (ID = 434444) Ampl/Mixer stereo amp unknown; Ampex; San Carlos, (ID = 434446) Ampl/Mixer
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stereo amp unknown; Ampex; San Carlos, (ID = 434442) Ampl/Mixer
Ampex; San Carlos,: stereo amp unknown [Ampl/Mixer] ID = 434442 576x336
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For model stereo amp unknown, Ampex; San Carlos, CA:
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Country:  United States of America (USA)
Manufacturer / Brand:  Ampex; San Carlos, CA
Year: 1961 ? Category: Audio Amplifier or -mixer
Valves / Tubes 6: 7199 7199 6973 6973 6973 6973
Main principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 117 Volt
Loudspeaker - This model requires external speaker(s).
Power out
from Model: stereo amp unknown - Ampex; San Carlos, CA
Material Metal case
Shape Chassis only or for «building in»
Notes Power amp stereo; pairs with Ampex Tuner Preamp 0118.
Net weight (2.2 lb = 1 kg) 0.5 kg / 1 lb 1.6 oz (1.101 lb)
Source of data -- Collector info (Sammler)

Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

All listed radios etc. from Ampex; San Carlos, CA
Here you find 68 models, 64 with images and 18 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Ampex; San Carlos,: stereo amp unknown
Threads: 2 | Posts: 2
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ampex: unknown; stereo amp
Jeff Droll

This is an amp identical to the one in my Ampex console unit. I hope to add pictures of it very soon. I also have the Owner's Manual with schematic I will upload with the pictures.


The stereo console is proudly displayed in our living room and is used regularly. In order to promote longevity of the amp I had to replace the voltage doubler in the amp with a bridge. I have not replaced tubes since. Aside from not being able to reach volume levels I rarely used, the sound got better

Hits: 1435     Replies: 0
ampex: Ampex stereo amp Mod.-ID = 127920
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


Ampex; San Carlos,: stereo amp unknown
End of forum contributions about this model