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previous: Richie J Fletcher: I had one that was like... -- 10/22/1998 3:29 PM View Thread

Re: AB165 to AA864

10/22/1998 11:16 PM
Andy Ruhl
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Re: AB165 to AA864
The AB165 is the first silverface amp, but in blackface clothing. Go ahead and change it to AA864 specs from the coupling cap right before the phase inverter all the way to the power tubes. I leave the preamp the way it is, but I remove the caps across the plate loads. I've also played with the 470k interstage feedback resistor a bit. I've found that removing it can cause hum, and I didn't bother trying to figure out where it was coming from so I put it back in. I prefer the AB165 preamp after those caps are removed.  
 
Andy