rshadley
Active Member
I know this has been discussed before, but I have a Dynaco Pas 2 preamp that I want to use with a Sargent Rayment SR-540 tube amp. The current input is via a 226K ohm variable resistor that sounds distorted at the max input level. I would like to replace these with a set of gold plated RCA jacks and want to match the impedance. Looking at the ST70 schematics, it appears that I just need to remove the potentiometers, connect the positive end of the input jack to pin 5 of the 7199 tube socket, a 470K ohm resistor from the positive end of the input jack to ground and a 10 ohm resistor to the negative end of the input jack to ground. Can anyone confirm this. I will leave the existing input jacks in place on the Sargent Rayment for possible reconversion with new variable resistors.