1. D

    Exorcising the Demons of Hum within Tubes

    Looking for experience and advice here on the subject of tube hum (and some crackle & hiss). I’ve been experiencing a bad bout with a quad of recently bought EL5’s. My system is dead silent and these tubes are making things unbearable. As this is the first time I’ve had to battle with this I...
  2. Manley Laboratories Absolute Headphone Amplifier

    Manley Laboratories Absolute Headphone Amplifier

    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...
  3. me2621a

    Balanced Triodes with 15%?

    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)...
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