Found this thread
http://repforums.prosoundweb.com/index.php?topic=36964.0
I drew this up.
? by parts indicate made up values I could not read the values from the pictures. I don't know where the ceramic disk would be used and I am not sure if there is any more parts in the bottom that are not visible.
I guessed the transformer would be wired in series for the primary and in parallel for the secondary because of the 47K drain resistor.
A lot of it is a guess. Anyone else have any ideas about the values or anything to add?
I guessed it could be a variation of a KM84 like circuit because of the number of parts and some values I could read.
Used stock parts in the LT spice program that is why two zeners the program did not have a 33VDC one.
EDIT 1/18/2020 replaced missing circuit diagram
http://repforums.prosoundweb.com/index.php?topic=36964.0
I drew this up.
? by parts indicate made up values I could not read the values from the pictures. I don't know where the ceramic disk would be used and I am not sure if there is any more parts in the bottom that are not visible.
I guessed the transformer would be wired in series for the primary and in parallel for the secondary because of the 47K drain resistor.
A lot of it is a guess. Anyone else have any ideas about the values or anything to add?
I guessed it could be a variation of a KM84 like circuit because of the number of parts and some values I could read.
Used stock parts in the LT spice program that is why two zeners the program did not have a 33VDC one.
EDIT 1/18/2020 replaced missing circuit diagram