Ordered Crack. Received Crack. Built Crack. Tested Crack. Connected Crack. High on Crack.
Love this amp. However, I am experiencing what sounds like a creaking sound in the left channel and with the volume turned down on all sources I still hear it. I resoldered all the joints, rechecked the wiring, voltage and resistance, none of the caps are blown, cleaned the pins on the tubes and checked for any possible shorts. My on/off switch stuck to the on position (It got hot during my initial solder, my bad)
If I adjust the 12AU7 in its socket the noise tends to lessen but it comes back and I assume that it might be the 6080. It is not a hum or a buzz because the right channel is dead quiet. It sounds like a creaky, rusty gear turning and it is very consistent. And it starts up as soon as the tubes warm up after about five minutes. I cannot hear it during the music but I know its there. I have over thirteen hours of burn time on the amp since I finished it.
I read Doc's diatribe on noise and the only thing it might be is a noisy tube. I am using Senn Hd 650's and they are perfect for the BC. I checked them out on two other sources so they are not the cause of the noise I am hearing.
Any feedback is appreciated.
Thanks
Mike B