I’m surprised I had not covered this one before, but I suppose it is a MKI, so it should feel fairly familiar.
There seem to have been a few different iterations — essentially just different flavours of the MKI, so keep that in mind when choosing transistors and biasing the circuit. Some versions also used the more familiar point-to-point MKI style board.
I found on the D*A*M forum that the Super Zee switch boosts the output. D*A*M uses a rotary for this, but I just put a regular switch on the layout.
Quotes from Dave Main re the side switch:
Basically it cuts the output limiting resistor in half, from the stock 2.2 Meg down to 1 Meg. The first batch of the new 2015 1965's that went to Joe all had approx 1.5 Meg limiting as stock and the Super Zee bypassed it entirely.
Also worth noting from another post: What no side switch? This is correct. It was making my tuning of the pedal a little erratic at times.
I have not listed transistor types, because they varied, and the chances of you having the exact same transistors D*A*M used — and for them to sound great in a MKI anyway are fairly small. Even from reading posts on the D*A*M forum, Dave appears to have moved away from using 2 x OC75s in this circuit because they were less stable than other options - and you can be pretty sure that D*A*M has a larger selection of transistors to choose from than you or I.
D*A*M 1965 VINTAGE TONE DISTORTER
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