I don't think is the Rocket cable. Try swap the 12ax7 also. I didn't swap my small tubes. just removed the KT88 and put in all 4 KT120. Problem solved. Dead quiet.
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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- 145 posts total
@zombiedad I should have some tubes delivered tomorrow for the swap. Let's hear! |
I’m assuming you sent it in, because of this problem? If it came back with a clean bill of health from Manley, it sounds like this problem was not taking place when they had it on the bench, otherwise I’m quite sure Manley would have contacted you about it (yes, no, maybe?). |
@dpop I sent it because when I received them they had non OEM inline fuse holders and one was DOA. I spoke with the seller and agreed that they should go to Manley for repairs/return to original configuration and any other repairs. I paid for checkup and a couple of tubes that had the key broken. Manley have been great. They have followed the journey on this and offered suggestions. The non conforming tube was brought up by them today/yesterday. |
- 145 posts total