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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?
Follow Ups:
If my memory serves me well ,the middle tube is the 12ax7!
/m
If you email any ATC dealer, I am sure they will provide you the answer.
I don't own one but a friend of mine had one many yrs ago.
Thank you..
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