Page 17 - Triwatt Custom Lead Amp Builder's Guide
P. 17
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:
TrinityAmps TRIWATT Builders Guide Ver. 2.31.docx- 17 -
