[AMRadio] Audio Warble?

Geoff/W5OMR ars.w5omr at gmail.com
Sat Sep 15 05:23:06 EDT 2007

Bow wrote:
> Anyone have a single 12AX7 mic preamp schematic?
> I could roll my own for a change...

Here's a high-impedance microphone input circuit that might help..


You could get any old tube-type PA system, and use an interstage audio 
driving transformer to go between the plates of the output tubes and the 
grids of the Class A modulators.

Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)

73 = Best Regards,

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