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I’m getting a hum in my integrated tube amp and it’s bugging me alot

Hi - first of all, here’s my system:

- Rogers High Fidelity EHF-200 mkII integrated tube amp

- Magico A5 speakers

- Merging NADAC + Power DAC

- Audience T2 power conditioner

- Purist cabling

I love the sound of my system. BUT…….I have been noticing a hum after about 10 minutes of use from my amp. There are two switches on the amp - POWER & OPERATE - that need to be turned on in order to listen to music. (The Power switch needs to be turned on about 30 seconds prior to switching on the Operate switch). With both KT150 and KT88 tubes (all matched), after about 10 minutes I hear an audible hum from the amp that is apparent from my listening position about 10 feet away. If I turn off the OPERATE switch, the hum disappears (but of course, then I can’t listen to music). I have contacted Roger (the company owner) who said it was noise from old tubes. But my KT88’s have less than 100 hours on them and they hum as well as the KT150’s (maybe a few db’s softer than the 150s’). 

 

Does anybody have any ideas about what causes this and how it might be fixed? Is this an issue that is endemic to tube amps? FYI - if this requires new tubes, then I need to switch back to SS as I’m not willing to invest approx $800/year in new tubes. 

 

I turn to the great wisdom of this forum to help.

 

Thanks - Matt

mwsl
2psyop's avatar
Ag insider logo xs@2x
2psyop
1,595 posts
 

deep_333 

You are the reason people stop coming to forums. Arrogance and stupidity just pour out of your mouth. You strike me as the type of person that just likes to shock people with your comments to get attention, like a child. My guess is that in reality, you're an idiot.

tablejockey
3,914 posts
 

Record a video with your phone describing symptoms and send it to the manufacturer.

Rogers is supposed to be a customer focused operation.

Is deep_333 ...you know who?

 

Looks like the new guy to ignore.

roxy54's avatar
roxy54
8,007 posts
 

+1 @tablejockey 

mwsl OP
52 posts
 

Sorry for the delayed reply……I appreciate the responses. I have previously sent a video with sound to Rogers and he said he couldn’t hear it. He does stand behind his equipment, so I will give him another shot with a new video.

I really like the sound of my system and the amp really fires up the Magico’s quite nicely. 

Yes - I current have the amp plugged into my power conditioner. I have tried it plugged into the wall, but the sound quality is better into the conditioner and there is no appreciable difference in the hum.

I will keep y’all apprised of what happens as Roger has always been quite responsive to my queries.

puptent's avatar
puptent
191 posts
 

tubes age and degrade. if it's 60 cycle hum I would suspect a capacitor, Transformer/ rectifier... Just curious, have you isolated the amp? Physically disconnected the inputs? good luck with your gremlin

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