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I strongly recommend that you try to repair your Electric Mistress only if you have sufficient knowledge in electronics. You can easily damage the BBD which is no more available as spare part which means your Mistress is irreparable damaged.
The following instructions are dedicated as help for experienced electronic technicians.

I reccomend to get your Electric Mistress repaired by Howard Davis or or contact Electro-Harmonix for an authorised repair shop.

Electric Mistress Voltage:

Here are the voltages and waveforms measured with my 1977 vintage Electric Mistress:

(Click for full size version of the schematic with voltages)

Schematic of the Electric Mistress With Measured Voltages

 Here are the waveforms maked in the schematic above:

Waveform A
 

Waveform B - proportional to VLFO
 

Waveform C
 

Waveform D
 

Waveform E
 

VLFO
 

Clock Signal