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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