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Red Bear MK60 Schematic and Info Needed

4/6/1999 7:34 AM
Thorny	Red Bear MK60 Schematic and Info Needed I just purchased a Red Bear MK60 over the net. It is supposedly a decent point-to-point amp head that is approximately two years or so old. Gibson has dropped the line like a hot potato. I am trying to get a schematic and information on this amp. It generally resembles Marshall form factor, single channel, preamp, master volume, presence control. This uses 5881s for power and oddball 6N2Ps for preamp. The only place I could find the 6N2Ps was Triode Electronics at $5.95 ea (they are not listed, I had to ask Ned Carlson). The only thing I know at present about the one I bought was that it is missing a fuse and the store it was traded into did not want to mess with it and auctioned it off (fairly inexpensively to me). It is safe to assume it is likely blowing fuses then. I suspect first thing to check will be a visual inspection for things burned, shorting, or out of place and check the 5881s to see if one is shorted. Any help in locating a schematic would be great as well as documentation and technical drawings or information. I may rewire it to used 12AX7s, but I should get it functional first. I will likely need the schematic for that. Thanks for any help. Also, forgive me if I say something stupid, I am a newbie to working on amps and my background is not electronics. This is therapy from my day job. JT

4/6/1999 7:34 AM

Thorny

Red Bear MK60 Schematic and Info Needed

I just purchased a Red Bear MK60 over the net. It is supposedly a decent point-to-point amp head that is approximately two years or so old. Gibson has dropped the line like a hot potato. I am trying to get a schematic and information on this amp. It generally resembles Marshall form factor, single channel, preamp, master volume, presence control. This uses 5881s for power and oddball 6N2Ps for preamp. The only place I could find the 6N2Ps was Triode Electronics at $5.95 ea (they are not listed, I had to ask Ned Carlson).

The only thing I know at present about the one I bought was that it is missing a fuse and the store it was traded into did not want to mess with it and auctioned it off (fairly inexpensively to me). It is safe to assume it is likely blowing fuses then. I suspect first thing to check will be a visual inspection for things burned, shorting, or out of place and check the 5881s to see if one is shorted.

Any help in locating a schematic would be great as well as documentation and technical drawings or information. I may rewire it to used 12AX7s, but I should get it functional first. I will likely need the schematic for that. Thanks for any help.

Also, forgive me if I say something stupid, I am a newbie to working on amps and my background is not electronics. This is therapy from my day job.

JT