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In Reply to: RE: Tube amp making a buzz posted by jhrlrd on August 31, 2016 at 09:21:01
A buzzing sound may also indicate that a transformer is going bad. If the amp was not meant to output as much current that the kt150 need it may have stressed your trannys. Maybe the insulation has developed a bad spot and has developed a short. Taking some resistance readings might show this up , but sometimes the problem won't show until your amp is energized.
Edits: 08/31/16Follow Ups:
I put the EL34s back in to see if it was the new KT150 tubes.
Nope, same noise with the EL34s
Did the manufacturer of your amp tell you that it was safe to use in your amp. If it is still under warranty you might be able to sneak it by the store you bought it from. If its mail order, good luck.
Yes, that's it in the link. It has a switch on the back for EL34/6550, to get it in the family range, then you adjust the bias screws.
The manufacturer didn't tell me directly it could use those tube, just somewhere on the forum, and I think in a Jolida ad it said you could use them. Minimal hours on it with KT150s. I plugged them in because the Electro Harmonix EL34s were useless
Edits: 08/31/16 08/31/16
I guess it is all water under the bridge as that trite saying goes. Hopefully it is not something major that is wrong. If your amp started making the odd buzzing after you put in the 150s then those tubes in all likelihood caused the odd noise. And since reverting to the el34 did not change things you must now do some serious checking. When a transformer is buzzing that causes a vibration so if it is a trans then you should feel the buzzing vibration of the offending tranny.
Well there was some mechanical noise from the tranny even though the power is run through a DC blocker. I was able to snug the bolts and the mechanical buzz is quieter.
now to just figure out this signal loop...
Ok, here's a new symptom. When the preamp is off but still connected to the jolida there is the noise. When I unplug the left intercon the noise mostly goes away! so it looks like a ground loop, but not in the AC, in the signal cable. now is it the amp or the modwright 36.5 pre?
To go from el34 to kt150 is a pretty big leap in current requirement both in the filaments and the high voltage current.
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