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Active member
Mar 13, 2006
a '93 BB (JTM-50)? There are Sovteks in there now.

EDIT: Marshall USA just told me it's a JTM45 not 50.
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New member
Feb 23, 2003
Wake it up with at least one vintage Mullard 12AX7/ECC83 in the V1 position. You can pick one up for about $25 or so and that will sweeten up that amp. From there the sky is the limit, literally. The true compliment of tubes in an original JTM45, or a RI that has been modded to get to the original sound, is GEC KT66 power tubes, Mullard GZ34 rectifier tube, and Mullard 12AX7 preamp tubes. That is a $600 to $650 retube at todays prices, mostly for the GEC's if you can find them. But without good replacement output and power transformers, and a nice tagboard to replace the existing PCB board in your amp, all those expensive tubes are wasted. Just my opinion though. But the JTM45 is what I consider the most usable and also pedal friendly Marshall amp out there. That is what I use for my avatar and my #1 and have for years.:salude


New member
Jan 10, 2003
Adding up a retube, new iron, replacing the circuit board, bench time and the street price of a used reissue, you might as well look into a used boutique or clone.

If you like to work on your own stuff and don't mind spending some money you'll probably never see again (not that it is necessarily a bad thing) then have at it.