[etech]

I disagree, the Model 90 with AVC and a single 47 output tube has the same front end as the early 70, just modified to use AVC.

I was thinking the overall gain including the audio stages might be somewhat less, thus causing the radio to play with less volume when using the avc circuit. I did notice that both the later model 70's and the model 90's with avc have an extra audio stage. I don't know how much that will affect the overall audio output.

I'll try to post a schematic later.

I would be very interested to see your circuit if you can find the time to post it.

Thanks,

Ed