Hi Everyone,
I am restoring a McCurdy tube based radio station phono preamplifier unit. It consists of a pair of AP 120 phono preamp modules, AM 410 mixer / monitor amp and a PS 850 power supply. It's light blue in colour. It is mounted in the console with the turntable on top.
Working on it is tedious, wiring and components are tight. Does anyone have any technical information on the circuits at all? There isn't anything out there except the AU 300 phono preamp. That gives some clues as to how they thought at least. These pictures may ring a bell with someone (I hope).
This gets restored keeping as much to original components to retain the sound character. The carbon composition (new) I'm getting are all out of tolerance, so I'm not happy about that one bit. Modern caps though. Sorry, it has to be reliable.
Thanks for any help at all.
-Chris
I am restoring a McCurdy tube based radio station phono preamplifier unit. It consists of a pair of AP 120 phono preamp modules, AM 410 mixer / monitor amp and a PS 850 power supply. It's light blue in colour. It is mounted in the console with the turntable on top.
Working on it is tedious, wiring and components are tight. Does anyone have any technical information on the circuits at all? There isn't anything out there except the AU 300 phono preamp. That gives some clues as to how they thought at least. These pictures may ring a bell with someone (I hope).
This gets restored keeping as much to original components to retain the sound character. The carbon composition (new) I'm getting are all out of tolerance, so I'm not happy about that one bit. Modern caps though. Sorry, it has to be reliable.
Thanks for any help at all.
-Chris
