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Pilot 248 integrated tube amplifier, rebuilt – $399 (with new quad of JJ 7591 installed) or $269 (without any 7591 tubes) This is a very nice Pilot integrated tube amp. Recapped using mostly Sprague Orange Drop capacitors. New filter caps. Many many new resistors. The amp uses all 12ax7 tubes except that the output stage uses P-P 7591 tubes, and output stage of each channel provides provision for balancing “AC balance”, “DC balance” and “Bias” — all of which have been set optimally for least distortion using my automatic distortion meter and with using the installed quad of matched new JJ 7591 tubes.
** I am providing the option to buy this amp WITHOUT ANY 7591 TUBES included**. If you choose the option of buying without the quad of 7591, obviously you will need to install your own, and you will need to make all the output adjustments yourself. The only way to optimally make these adjustments is with an automatic distortion meter. Any other method is a large compromise.
With this new quad of JJ 7591 installed, the real measured power output at extremely low distortion (approx 0.1% THD) is roughly 23w per channel with 8-ohm load (approx 25w/ch if you measure up to 1% THD). If you buy with the JJ 7591 quad, the original boxes for the JJ tubes will be included as shown in the first photo. This Pilot features Big beefy output transformers that are as big as the power transformer. Very high build quality that Pilot is know for. Nice amp, sounds great, this one really rocks the cradle.