Hello again Luxfire,
I appreciate the thanks :wink:, though SunnySkyguy also contributed to your eventual fix. :smile:
Please have a look at the modded picture below.
I can only see 4 diodes in total.
D1 and D2 are 12 volt 400mW Zener Diodes, used to maintain the voltages on the +12V and -12V rails.
D5 could be a Schottky diode (1N5819) or a general rectifier type (1N4002 - 1N4007). Though you should be able
to determine its type by reading its number on the diode body.
D6 would more than likely be a 1N4148 small signal diode.
What is the circuit designation of the diode you need to replace?
If its one of the glass passivated zener diodes (D1 or D2), it wouldn't hurt to replace it with a 1Watt type. In fact, since they
would be relatively cheap, it wouldn't hurt to replace them both.
Please let us know how you get on. And by the way, WELL DONE it getting this problem solved. :-D
Regards,
Relayer