EHX Electric Mistress Schematic Wanted

[CJ]

got a weird one here, early rev of the Electro Harmonix Electric Mistress,

got on this site but they do not have a schematic with four transistors, all there's have two,

http://www.metzgerralf.de/elekt/stomp/mistress/index.shtml

and the mystery chip is not on there either, looks like a Signetics 7320 which appears in no searches.

caps are ITW instead of green meanies,

transistors are 2 ea C309 and 2 ea 2N3563




thanks for any info on a schemo or the S7320!

 

[CJ]

a couple of the chips have been sanded,  here is the 7320>

 

[CJ]

ok the S7320 is a 741 opamp with the p/n sanded off and the extra transistors have base tied to emitter so they are diodes,

splicing in the changes to schematic now,

original schemo>

 

[rackmonkey]

A different schematic of the Mistress.  Mystery IC is identified, FWIW.  Some voltages marked as well.

 

[CJ]

that's it!  where did you get that!  thganks!

idiot cj flipped the emitters thinking forward bias,

will delete bad print,

 

[rackmonkey]

the wayback machine knows all.