![]() ![]() ![]() This is just another price you pay for getting that specific tone. They are run hot which decreases their life dramatically. The tubes in those combos are good for about 6 months before they need replacement, unlike other amps that may use tubes that last much longer. I suspect this is the problem you had with your first and second amps. New tubes do make a huge difference and when they get old the background noise goes way up. The tube type and biasing make a much bigger difference on those amps. ![]() What you hear with all the gain knobs up is normal and other then redesigning the amp, you'll get the same thing with most of them. It would be highly unlikely anyone would crank the reverb and the amp gain up to max so that noise isn't heard. One half the tube drives the spring transmitter element, the other half amplifies the receiver element at the other end of the spring. The reverb section uses two additional amplification stages using a 12AX7 tube. You can use different tubes and bias the amp cooler to reduce it but then you loose the gain the amp produces. You cant get both a silent background and have hot biased sound in that amp design. The Vox AC15C1 is cathode biased so its going to have more hiss then other amps and the EL84 tubes tend to be biased hot but its done to get a specific driven tone. Most vintage tube amp designs do make some background hiss. You have to realize you're dealing with a primitive technology. I would appreciate your viewing the recording I posted to YouTube and offering your opinion: is it just me, or does this amp make too much noise? Trying out the replacement unit, (purportedly also a brand new amplifier), I find that it emits an unacceptable amount of noise, even while no guitar is connected, and I've verified that it is plugged into a properly grounded outlet. Unfortunately, this tale hasn't yet come to a happy ending. distributor, KorgUSA, then working with them through the service center, I was able to get a replacement. Ĭomplaining mightily to the exclusive U.S. They diagnosed a bad reverb tank, and stated that the repair part had an 8 - 10 week wait. Leaving out some of the story, I'll just mention that I took the amplifier to the nearest authorized service center. I bought a new VOX AC15C1 recently, and was disappointed to discover that the reverb was inoperative right out of the box. Would appreciate your opinions on whether this new VOX AC15C1 is more noisy than a tube amp ought to be. I'll leave the rest of the post as is, along with comments to capture any wisdom here. ![]() Removing the amplifier from that room however, and plugging into grounded outlets elsewhere in the house, reduced the buzzing to an almost inaudible, and certainly acceptable, level. Not, mind you the particular outlet I was plugged into, because different outlets in that room that I know to be connected to different circuits, and into different breakers, each induced the buzzing. so, I've wiped the egg off my face, and can now let the few readers who've shown probably more interest and helpfulness than I deserved, that after another trip to the service center and more testing at home, I have concluded that the buzzing noise apparently emanating from the reverb unit into the power section was induced by the room I was playing in. ![]()
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