So what made the Block Letter ones sound better than the later Signature model?. So obviously finding a 34 year old amp with original tubes is nigh-on impossible! but this one has just been serviced and fitted with a set of tested, very healthy Peavey Super 6 Power Tubes and 4 out of 5 Super 7 Preamp Tubes, the phase inverter slot has a JJ in it.
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