Bell and Howell Model 621

[munkeyboy]

This is work in progress.  Thought I post here in case others are interested or want to improve it.  The original schematic is unreadable in most places, so I've try to transpose what I could to a new schematic.  I used the original model 621 schematic, the model 179 schematic (which should be close) and my physical amp.

Still tracing down components, so this is probably wrong, especially around the tone circuit.

Also included an altered version, that matches what I've done so far in removed unneeded components. (plus mod to the input that I'm still testing).

Updated: new schematics below

[munkeyboy]

updated files

[Nukemdave]

Hi Munkeyboy, Any chance that you could Jpeg the modified wiring diagram as I have a 621 amp that isn't responding that well.

[sluckey]

PDF is better. Both files included.