I didn't read every post, just the first half of them. I'm going to say that it's the transformers themselves. I had this problem with my Luxman integrated. It was dead quiet for several years after I bought it, then developed a low hum. It is always the same, comes from the amp, not the speakers, and is independent of any controls or devices. The fix is new transformer(s), which is expensive, and not a guaranteed remedy.
Hum on Tube Amp - Can't find source
I have a hum (60hz) I can hear on my speakers and it happens with my tube monoblocks (either of them). With or without interconnects, it even happens on either amp (have tried one at a time) with every circuit on the house tripped/disconnected, every other component disconnected from the wall (including the Internet/CaTV line) and no interconnects.
One amp has it as soon as it warms up whereas the other one is intermittent.
Hum X doesn't solve it, iFi Ground defender either, AVA HumDinger on powerline doesn't solve it either.
I have replaced the tubes and both amps were just tested at the factory. Replaced the circuit breaker, tightened every wire on the breaker box, checked and cleaned all connections to ground rod. Added a hum eliminator to the internet line.
Hum cycles a bit with the tube glow matching the cycles.
I'm waiting on the power company to come check the power coming to the house.
Thoughts?
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Have you tried connect a different pair of speakers on your Manley Snappers?
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Another good point. The manual states: Recommended Speaker Load: Optimized for 5 ohms Do you know what impedance your speakers are rated ervikingo?
To me, this is the most concerning factor in this whole scenario. Here’s a few other tidbits from the manual: -For the power tubes in our amplifiers, after a few years if you notice a small revolt going on where several of the output tubes are misbehaving or getting hard to bias, you might consider doing a full re-tube. -Three tube types that are electrically and plug-socket compatible with the 12AT7A dual triode include the 6021, 6679, and the ECC81 (I find it a little interesting that they made no mention of a 12AX7 here). -Never operate the amplifier without a speaker load, or suddenly disconnect the speaker load while the amplifier is producing a signal. This risks punch-through of the enamel insulation covering the transformer’s internal magnet wire. Permanent damage to the output transformer may result -Additionally, it is best to cut power to the Snapper when not in use rather then leaving the power on indefinitely. This will enhance tube and system life.
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- 145 posts total