by snitch56 » Sat May 16, 2009 7:29 pm
Thanks Tom.
I too thought about tearing apart the PAT4 and using the chassis for an Aikido or tubes4hifi sp-6, but I couldn’t find the courage to do it. So I did a complete restore on the PAT4 using the VanAlstine modifications (new PS, tone control deletes, replacing all electrolytics with film and tantalum capacitors, etc..). The project put some life back in the old preamp. The output seems a little on the high side to me but I will continue using it for a few weeks to see if things start to stabilize during the burn in period. I was surprised to see that every original resistor in the preamp had drifted by a fair amount. I replaced all of those with some metal films.
Brad