Class A Reference Quality Triode Tube Headphone Amplifier / Preamp, switchable between Single-Ended and Push-Pull, adjustable Negative Feedback, three gain settings, 4 pin XLR output, 3 selectable impedance settings, switchable mono / stereo, left / right balance, defeatable bass / treble EQ...
Hi, I ordered an NOS RCA 5691 with a triod readings of 51/59 based on the sellers test equipment. If I have done the math right, they are about 15% out of balance. I am going to be using this tube in an Amp and Sound Mogwai SE (which uses one triode for the left channel, and one for the right)...
SOLD This tube is microphonic in my preamp when you tap on the chassis, but no indication when just playing via speakers. It still sounds like my other Sylvania GTBs, but I am thinning down my 6sn7 cache. Could be a budget find for someone. Flat $10 shipped in CONUS.