2. amps-preamps
  3. 134032-70

Rectifier Hum

I have a Dennis Had Inspire Fire Bottle SEP HO amp that supposedly will work with just about any rectifier. I was using a new Gold Lion GZ34/U77 for a while and recently noticed a low hum from my subs. Took everything apart, checked cables, etc., and finally got to the tubes and discovered that swapping out the GZ34 with a Shuguang 274B fixed the issue. Assuming the GL had gone bad, I bought another GZ34, a JJ this time, stuck it in and there's the hum again. I also tried the originally supplied JJ 5Y3S and it hums also, but less than the Gold Lion or the new GZ34…why? I don't want to send the amp back to Dennis as it does work fine with the 274b, but it's on my mind so I seek counsel. Help me…help me…Atmasphere? 

wolf_garcia

Showing 1 response by trelja

trelja
3,223 posts
 
@wolf_garcia most probably unrelated to the different voltage drop of the 3 rectifiers as the 5Y3 should have the largest, but just have to ask...

You recently bought a pair of Klipsch Heresy III, with (I think, but could well be mistaken) significantly higher sensitivity than what they replaced. Sometimes, we don’t immediately notice such an impact, but any potential correlation?
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