The boards are complete, installed and the sound, with the exception of a loud hum seems fine. The hum is loud regardless of the volume setting, although it diminishes slightly with the volume knob turned all the way up. The hum is about equal in volume to the sound listening at a low average level in a small room. It seems to be only in the Preamp.
I think I have all of the connections correct as well as the wiring done per the information Mr. Mottram sent me. I decided against the blend and tape switches, eliminated the power on light, and the remaining switches along the bottom front panel.
I tried cutting the F+ F- and B+ connections to the phono board, the hum continues, also disconnected the input to the line board, still the hum persists.
The only things I have not replaced are the 12X4 socket and power transformer, I'm wondering if it may be causing the hum.
I've been in touch with Mr. Mottram and so far we don't have a solution.
This is an interesting project as this is a preamp I first wired as a kit in about 1969. I did an ST 70 the same time and have also recently upgraded it with Tubes4hifi components. I don't mind these little obstacles as I'm learning things I should have learned 40+ years ago, nonetheless, I'd like to solve the problems and enjoy the improved PAS 3X and ST 70.
Any suggestions will be greatly appreciated.