Quote:
Originally Posted by Jaybird
When I connect the NFB r to pin 8, There is a horrible squeal that happens as soon as the tubes warm up. I have jumped the 22pF/1 meg low freq filter. I will put in the 2.2M r from #1 input hot to ground and see how it goes.
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If I'm not mistaken, you said you had it on pin 7 in a previous post. Pin 8 (the correct pin) should cause no problems. The horrible squeal may be from using a mic with no input resistor.