Heathkit AG-9A audio generator schematic !!!

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Hi Mike,
You mean that one of the tubes (or both) in that schematic have been replaced with 12AX7? Hmm.... strange.
I'll say! The unit used pentodes and subbing in triodes is really weird. I've only ever seen small changes in the manual, never anything as fundamental as this appears to be.

Hi Aldovan,
Does this unit appear to have been worked on at all? I'm wondering if it wasn't modified by someone. If the serial number is very low, it might be one of the first ones made. Always a possibility.

-Chris
 
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