I recently decided to reenter the Stereo/2 channel fold with some vintage gear.
I just picked up a Dynaco PAT-4, please forgive me it's SS but once I get it going I'll be looking to pick up a PAS-3 and ST-70 or the newer incantations of them.
I have started going through the PAT-4. I replaced the power supply, replaced the volume control with a 24 step attenuator, removed the Tone and Loudness controls from the circuit.
Next the I/O board will be replaced and the selector switch (the old one has cracked wafer). I am also replacing the old solid core wire as I go along.
I have 2 questions.
1- The Tone Controls. I disconnected the tone controls. The treble control on the schematic looks like the PC board lugs should be left open. The BASS CONTROL on the other hand looks like the 3 PC LUGS should be shorted together. Am I reading this correctly?
2- The Phono section. I plan on removing the Ceramic and High inputs and just going with the Magnetic Input.
A- do I need the PEC currently attached to that lug
B- If removed do I need to connect a 150K resistor from the center contact to the RCA shell, which appears to be what the PEC does?
C- The reason for my confusion, is the manual discusses changing the SPECIAL INPUT to a phono input by moving a wire from the PC Board to the selector switch, But I don't see it connecting through the PEC?