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A small FET gainstage is the spirit of the Pass B1
A small FET gainstage is the spirit of the Pass B1
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Old 6th December 2017, 11:08 AM   #11
xrk971 is offline xrk971  United States
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A small FET gainstage is the spirit of the Pass B1
I can attest to the BF862 in this configuration as absolutely low noise below measurement capability of equipment of mere mortals (-130dB). I have built Juna’s BF862 preamp and it sounds great. Nothing audible with no signal. Also, volume pots don’t make any scratching noise when adjusted. Pure smooth as butter volume adjustment.

Regarding M2, I have noise/hum issues well beyond specified 600uV due to mains transformer EMI coupling into small signal transformer when in same box. I would highly recommend a SMPS to get the +/-24v power supply and save yourself the hum headache.
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Last edited by xrk971; 6th December 2017 at 11:12 AM.
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