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You will also see a coupling cap in between triode stages. The coupling cap controls the bass
and rolls off bass between stages and blocks DC from entering the next stage - which could
throw off the bias on the next tube stage. As usual, smaller values roll off more bass, larger
values retain more bass between stages.
Another modification you may see is a Grid Stopper Resistor, this can also control gain
between stages and also interacts with the tube to roll off highs. Values can be 1.5K->100K.
Larger values roll off more highs and reduce gain between stages. The Grid Stopper Resistor
works best when mounted directly or as close as possible to the grid pin.
"Complete" typical tube preamp stage:
Содержание Trinity Tweed Amp
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