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Less gain in valve jr mods

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larsthestrat:
final quistion, I thought that bij removing C4 the amp losses some of it's bass. Is this correct?

mc_guitar:

--- Zitat von: larsthestrat am 23.03.2011 08:42 ---final quistion, I thought that bij removing C4 the amp losses some of it's bass. Is this correct?

--- Ende Zitat ---

No. C4 reduces the local negative feedback for that tubestage. With 22µ it should be almost fully compensated and you have no lnfb for the full frequnecy range. So you get more gain overall. If you only lower the value of C4, say 100nF you will reduce the nfb for only the higher frequencies. That will result in a higher gain for highs and a lower gain for the lows. So you will hear less bass, because it has less gain than the highs.
For that read http://www.freewebs.com/valvewizard1/gainstage.html

Cheers Micha

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