preamp for hlly tamp-90

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hi all, id like to add a preamp to my tamp-90, but i dont want to spend lots of cash or add extra boxes.

can anyone suggest a small pcb preamp that i could shoehorn into the case with the amp? i dont need any extra inputs or fancy features, just to get the best out of the amp, which by all accounts sounds a lot better with a preamp.

obviously if i spend too little, ill just make it sound worse, so any suggestions most appreciated.
 
Just a quick further note to say the amp has a whacking great 24-0-24 toroidial transformer in there, and the dc regulator is on the power amp board, so whatever preamp would need to feed on either +-24v or a stolen 5v or 10v dc from the amp board.. it would likely need to be fairly noise immune.
 
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