unclej Posted February 3, 2005 Report Share Posted February 3, 2005 i just finished refurbishing an old class a amp for my partner here at the store. it's truly a great sounding amp...fairly good volume and overdrives at about 6 or 7. you could gig with it in a smaller venue but i got to wondering how you could modify it to be used as a pre-amp. i'm assuming that you couldn't just run a jack off of the speaker cables because it would change the whole impedence thing. so can it be done and how would you go about it if you could. there's three inputs so one of them could be converted to an output but where would you get your signal from? Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted February 4, 2005 Report Share Posted February 4, 2005 where would you get your signal from? I'm thinking just before the power amp section would be a good place. In essence, that would give you a preamp out. A voltage divider might be required to bring the signal down to line level if it's a pretty hot signal. Quote Link to comment Share on other sites More sharing options...
lovekraft Posted February 4, 2005 Report Share Posted February 4, 2005 Take a look at Doug Hammond's DIY Pedals and Amps page. Scroll down to the "Firezog" - that's probably gonna be what you're looking for. Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted February 4, 2005 Report Share Posted February 4, 2005 Well, if unclej is talking about a line out, then that Firezog thingiew could work. I was thinking he describing a preamp out, but maybe he meant a line out? Quote Link to comment Share on other sites More sharing options...
unclej Posted February 4, 2005 Author Report Share Posted February 4, 2005 thanks lk...that's exactly what i needed. the 10 ohm resistor was the answer to the question i had about the lack of impedence. maybe someday i'll grow up and know where to find all these things thanks paul..i was looking to use the amp as a preamp as opposed to boosting the signal out.. later Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted February 4, 2005 Report Share Posted February 4, 2005 Cool, as long as you got what you wanted. Quote Link to comment Share on other sites More sharing options...
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