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Re: "Hot-rodding" a Marshall JCM800?
1/2/2004 11:21 AM
Bob Cob (186) wrote:
Before taking an iron to such a wonderful beast, I suggest a) getting a better cab with 4 12s like the other guy suggested, preferrably celestions, but you could buy a cheap cab and upgrade those later, or, if there's room for expansion in the cab you have, you could fool around with it some. If so, you could maybe buy two speakers at a time, which would certainly be easier on your wallet than buying a brand new celestion-loaded cab b) experiment with different power tubes, like KT66s or 88s (i can never remember which one works for that, or maybe its both). Also, feel free to try different preamp tubes, get one with a lower gain rating than the ECC83s that are in it (I'm guessing anyway), and switch it around in different sockets, this, I've heard, can durasticaly decreae the volume without harming anything or changing the tone that much (I read that somewhere, I'm thinking its the first socket). Also, if you havn't done it in a while, and especially when/if you get new/different power tubes, bias the amp (!) that can make quite a difference in tone and make your tubes last a lot longer, win win situation. Have fun, but I don't suggest having an iron anywhere near something that awesomely perfect, not to mention finicky, too easy to screw something up. I hate to say this, and I'll probably get a lot of lip about this, but if it's anything electronic (guitar amp or otherwise...ever heard of lucas electronics? wow) made in Britain, if it ain't broke don't fix it.