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Old 9th October 2012, 07:31 PM   #1
diyAudio Member
Join Date: Aug 2012
Default Grommes S35 booster amp output?

I have been tinkering with an old Grommes S35 PA amp from the 60's for a few weeks now. I got it working, nice clean sound and actually sounds very nice with my old les paul, just not much gain. I did wire the two gain stages together in series with a switch, got a nice little gain boost, but not a bunch. The question: There is an RCA output that is labeled "Output tape recdr booster amp.". A friend of mine mentioned that I might get some more gain from the pre-amp stages if I feed this back into the first stage. Is this crazy? Im pretty new to tubes, so thanks in advance for patience and advice!
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Old 9th October 2012, 08:23 PM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
Join Date: Nov 2003
Location: Brighton UK

Yes it is crazy. It will just oscillate. The output is for a tape recorder or
booster amplifier. Use a clean level boost pedal on the input for more
gain, done right it should overdrive the first gain stage into "dirtier".

rgds, sreten.
There is nothing more practical than a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 9th October 2012 at 08:27 PM.
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