Hi,

A friend brought me a ’77 memory man to fix that he bought at a garage sale (not working). It looks just like this one:

https://www.ehx.com/assets/reviews/flashback-memory-man.jpg

It’s the black screen print and the unit reads:
‘Solid State Echo / Analog Delay Line’

The circuit board is labeled ‘EH 1309A’.

It has had some mods done it (poorly). It only puts out white noise in delay mode.

I am hoping someone can point me to a

1.) Schematic for the 1309A circuit
2.) Layout (would be amazing) – or an internal photo from one of the 1309A series
3.) Calibration procedure for the trimmers on the inside of the unit.

I want to bring it back to stock to begin and then hopefully debug it back to a working state.

Thanks!
Mike