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preamp Air Tight ATC-3 valves layout

Hello there,

I just bougt second hand ATC-3 and there is a hum sound thar is also transmitter to the speakers.

I oppened the unid and found that the layout of the 3 valves is not marked. There are 2 12au7 and 1 12ax7.

I dont know where to place the 12ax7 !

Any help?


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Topic - preamp Air Tight ATC-3 valves layout - Valvulator 05:57:29 07/07/12 (3)

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