ha ha ha. I dont own a gravel but own 3 Orbea mountain bikes N+2
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
@ervikingo Hope your hum is still a non-issue. I'm anxiously awaiting the delivery of my first tube monoblock amps. I had a hum issue with my solid state amps, even with all new electric dedicated 20amp lines and audio grade outlets. Thank god a single humX fixed the issue, but I'm kinda nervous about my new amps since I won't be using dedicated and newly run outlets. I'm probably gonna have new 20amp lines run with audio grade outlets placed once I know where I'm gonna have my amps set up more permanently, but just kinda nervous. Well see... I'm also probably gonna ask the dealer I bought my amps through to lone me a puritan 156 with ultimate cable to A/B things should there be an issue. |
Put together any tube amp and the hyper efficient Klipsch Lascalas (or Klipschorn) and that efficiency will dredge the bottom of the amp's circuit mercilessly revealing the slightest hum, Paul Klipsch must not have minded this issue. (Early on he used tube amps until later Crown SS) Admittedly, all is forgiven and forgotten once the music is playing. However, pauses or gaps in the stream of music and HELLO there's the hum again! Being OCD, i.e. today's audiophile, and introduce said hum, and no matter how minuscule it can become deafening. Like most who are in this spot we have applied every tweak possible. And we have had a measure of success. But tube amps use tubes. Tubes are a moving target They are like candles gradually burning out. As a consequence, noise can increase here and there among the family of tubes as they interact with each other. The last couple days, after a month of nearly continuous (nearly) silent operation, no matter what I did, the hum had once again risen above my personal limit. After doing my due diligence and double checking the common culprits, I was defeated. Then on a whim I rotated the power tubes leaving the same but moving the big ones around. Hum GONE! Why is that? |
- 145 posts total