G'day! I recently picked up a 1989 Mark I reissue. The boards say 1A, however, the original circuit is almost the same as this one (allegedly a Mark 1B):
http://tubefreak.com/mkirga_1.jpg
http://tubefreak.com/mkirga_2.jpg
The only difference between the original circuit of my amp and the schematics above is that the power for the reverb drive transformer is supplied slightly differently - this appears to be a factory change.
Long long ago this amp was modded by someone to like this: http://members.shaw.ca/lauriepedals/M1R_changes.jpg
My question - put it back to original spec, or leave the mods? The presence mod maybe looks like a Mark II? and the invertor mod looks maybe like a Mark III?
PS: it sounds very acceptable. Clean is crisp. Gain is a bit grainy.
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UPDATE
Talked to the local Mesa tech today and he was pretty clear - change it back to original, it will have a great tone.
http://tubefreak.com/mkirga_1.jpg
http://tubefreak.com/mkirga_2.jpg
The only difference between the original circuit of my amp and the schematics above is that the power for the reverb drive transformer is supplied slightly differently - this appears to be a factory change.
Long long ago this amp was modded by someone to like this: http://members.shaw.ca/lauriepedals/M1R_changes.jpg
My question - put it back to original spec, or leave the mods? The presence mod maybe looks like a Mark II? and the invertor mod looks maybe like a Mark III?
PS: it sounds very acceptable. Clean is crisp. Gain is a bit grainy.
================================================================================
UPDATE
Talked to the local Mesa tech today and he was pretty clear - change it back to original, it will have a great tone.
