tourmaline
Headphoneus Supremus
- Joined
- Nov 10, 2003
- Posts
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Quote:
That's because you swapped the tubes and they might have different specs, so other tubes then originals might have some hum from the powersupply.
Originally Posted by geoges.ravel /img/forum/go_quote.gif Hi guys, sorry for not responding for a long time. I was busy chasing the tubes. I don't know why the thread alert doesn't work. Now I've gotten some Tungsol 6SL7GTs and see why people said what they said about the Cary. It does sound beautyful! And I would like to thank all you guys helped me figure out the problem. (A special thank goes to Sergei who helped a lot!) Now let's start another round of quest. But before that I need to mention that my Cary is a 1994 version so quite old. No that it sounds great, but there is very annoying hum problem. headphone is usable only at a very high level. With speakers, I have to raise the volume to cover the hum but that's OK. The volume of the hum is unrelated to the change of volume or sources. I tried swapping the tubes: with the 6SN7EH, hum is much less severe but I prefer the Tungsol with hum than the ElectroHarmonix without hum. I have no idea where the hum comes from, is it related to the tubes or it is amp? Would it be possible to fix it by replacing parts or something? If it is basically caused by the tubes, what tube do you think has the most effect on that? The driver (6SL7), input(6SL7), or output(300B) tubes? If it is the output tubes I'll not be able to experiment since I have only one pair of them. Please help guys. |
That's because you swapped the tubes and they might have different specs, so other tubes then originals might have some hum from the powersupply.