It appears this shematic is requested by many, but not available online. Here it is for the taking. This schematic has been completely relabeled for ease of reading. The original is not great quality.
So, why is this schematic so hard to find? Well, it really isn't. When you remove the bottom plate from the amplifier, it's glued to the surface of the cover. If you're missing the cover, or the schematic has been removed, look below, copy and print.
If the bottom cover plate is missing, it's important to have one made. (Not Aluminum) This cover reduces hum; a factor unwanted during recording.
Close-Up Of The Tubes
THE PLAYBACK TONE ARM
This is a commonly used Astatic tone arm, seen on earlier Newcomb transcription players. If it's not broken, don't fix it, but the wiring on this arm was very corroded. It's very easy to replace the wiring and install a quality RCA connector. The cartridge is a genuine GE VRII, also used in Newcomb transcription players.
CUTTING HEAD ASSEMBLY
CENTER LOCKING PIN
To prevent slippage during the cut, a locking pin is necessary. It was missing, so I used a wood screw to create a new one. After selecting the proper diameter, I cut off the threaded portion and ground the head flat. Absolutely perfect.
Through age and use, your cutter head may require repair, or rewinding. Click the image on the right for details.