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In Reply to: RE: Why did you plug in the 150s? posted by DAK on August 31, 2016 at 19:25:05
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 08/31/16Follow Ups:
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?
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