I've read that the JJ pre amp tubes are a bit microphinic. Just to be clear, are they THAT bad? The amp I'm ordering comes with them so I'm not sure if I should take out the JJ pre amp tubes (which the guy says they're new) and put 3 tung-sol pre amps in there.

jj's aren't known to be very microphonic, afaik. they are known to be pretty dark though, so if after a while you notice you want a bit more brightness, go with some tungsol preamp tubes.
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