Members !i!i!i!i!i! Posted January 18, 2007 Members Share Posted January 18, 2007 I have a musicman hd130 212 which is very much like a twin. it has 4 el34's in the power amp and 1 12ax7in the pre amp. ive read online on a few boards that bands like the dead kennedys, the sex pistols and a few others had their fender twins tweaked to get more gain. i read that this was accomplished by pulling 2 of the tubes out of the amp. is this true and would it work with my amp? which tubes would you pull? thanks in advance. Link to comment Share on other sites More sharing options...
Members Johnny Z Posted January 18, 2007 Members Share Posted January 18, 2007 You don't get more gain doing that you change the impedance of the signal going to the output trannny. Yes it will work on most tube amps if you pull one set of power tubes. I don't think it hurts the amp as much as it hurts your tone. Link to comment Share on other sites More sharing options...
Members tommythelurker Posted January 18, 2007 Members Share Posted January 18, 2007 Technically it actually reduces gain, but most guitarist don't really understand gain and just associate it with distortion. Removing two power tubes will cause the remaining power tubes to start to saturate at a slightly lower volume than with all 4 tubes. It roughly cuts the power output in half. Unless you're running the amp VERY loud, it's not really going to make much difference though. It does change the impedence, but you can correct for this. Just think of the amps impedence as doubling. If it normal expects a 4 ohm load, with 2 tubes pulled you would now want to connect an 8 ohm load to compensate. Link to comment Share on other sites More sharing options...
Members Ancient Mariner Posted January 18, 2007 Members Share Posted January 18, 2007 This is a musicman, so it's a solid state pre-amp and valve power amp. That 12AX7 is the phase inverter. Don't expect it to necessarily behave like a 'normal' amp: it certainly won't give you much more gain with 2 valves pulled, and it might fry the output tranny. If you really want more gain then use an overdrive pedal as a booster to slam the front end harder. Link to comment Share on other sites More sharing options...
Members tommythelurker Posted January 18, 2007 Members Share Posted January 18, 2007 This is a musicman, so it's a solid state pre-amp and valve power amp. That 12AX7 is the phase inverter. Oh, I was wondering how they got away with only one preamp tube... Link to comment Share on other sites More sharing options...
Members !i!i!i!i!i! Posted January 18, 2007 Author Members Share Posted January 18, 2007 yeah thats what im going to go off and do. anyone think the sd-1 is a good choice? Link to comment Share on other sites More sharing options...
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