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    Mark IIC+ Schematic (correct!)

    I did find some more vintage transistors for MPSA20, MPSA70, and MPSA63 on eBay and re-did the board...now it's working. Just some final spots to clean up and I think this thing will be done. Thank you, Jay Omega.....your help is greatly appreciated.
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    Mark IIC+ Schematic (correct!)

    Yes….turned out to be an issue with the transistor orientation. I built two boards....one using the stock transistors MPSA63, 2N2906, MPSA20. I also did a different one with BC557C, BC547C. The orientation of these are opposite. For this amp, I’m using a custom PT from Heyboer that has it’s own...
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    Mark IIC+ Schematic (correct!)

    Dan_O (or anyone else)....I built a Mark IIC+ preamp based on the SloClone schematic and struggling with the EQ circuit. The power section is a basic Marshall 100W. The Amps works without the EQ by jumpering the preamp in the PI input. When I try the EQ board, I get what sounds like 60 cycle...
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