NOSValves Posted January 25, 2006 Share Posted January 25, 2006 Just how much noise are we talking about here? Can you hear at your sitted position or do you have to put your head up to the speaker? Craig Quote Link to comment Share on other sites More sharing options...
tgourlie Posted January 25, 2006 Author Share Posted January 25, 2006 So I think I can close the book on this. Today I hooked up the New Mac C2200 with the Mac MC2102, with a Mac MCD201. .............. .. . . . . . . . . . . . . . . . I GET THE SAME NOISE!!!!! (and that was with Canton speakers, not close to the sensitivity as mine) Does everyone's amp have this noise floor? It sounds like even with $14,800 worth of Mac equipment, it still buzzes. Couldn't you tap into the output of that noise, take it down to line level, phase shift it out of phase and run that into the input. Then you would technically get a silent output. Quote Link to comment Share on other sites More sharing options...
Erik Mandaville Posted January 25, 2006 Share Posted January 25, 2006 "So I think I can close the book on this. Today I hooked up the New Mac C2200 with the Mac MC2102, with a Mac MCD201. .............. .. . . . . . . . . . . . . . . . I GET THE SAME NOISE!!!!! (and that was with Canton speakers, not close to the sensitivity as mine)" This might point to the possibility that the noise isn't on that particular stage of your system. I don't know if you have done this, but, after turning the amplifier off and letting is sit for a minute, unplug the inputs from your source/preamp. It's better to short the inputs altogether with shorting jacks, which you could make, but just check to see if the residual noise drops (or completely goes away) when a source isn't connected. It may not be the amp. Erik Quote Link to comment Share on other sites More sharing options...
Erik Mandaville Posted January 25, 2006 Share Posted January 25, 2006 Delete: This has been suggested. Good luck, Erik Quote Link to comment Share on other sites More sharing options...
Erik Mandaville Posted January 25, 2006 Share Posted January 25, 2006 "I have noticed that valve #1 on the preamp stage of the amp does not glow at all. No matter which tube I put into that socket. Hear is a simplified schematic of the amp." This could be a problem. If you don't know how to check the wiring to confirm a working heater supply to that particular socket, have someone check it for you. Erik Quote Link to comment Share on other sites More sharing options...
mike stehr Posted January 25, 2006 Share Posted January 25, 2006 "So I think I can close the book on this. Today I hooked up the New Mac C2200 with the Mac MC2102, with a Mac MCD201. .............. .. . . . . . . . . . . . . . . . I GET THE SAME NOISE!!!!! (and that was with Canton speakers, not close to the sensitivity as mine)" Quote Link to comment Share on other sites More sharing options...
Erik Mandaville Posted January 25, 2006 Share Posted January 25, 2006 Mike: Ah, ok... I was thinking there was a separate preamp being used in this equation. I just checked the schematic. Erik Quote Link to comment Share on other sites More sharing options...
mike stehr Posted January 25, 2006 Share Posted January 25, 2006 It's all good Erik. Maybe it's a house wiring issue........ Quote Link to comment Share on other sites More sharing options...
tgourlie Posted January 25, 2006 Author Share Posted January 25, 2006 When I hooked up the Mac equipment, I was not at my house. I just wanted to see if other amps, in other places, made a noise that was similar to mine. Thanks for all the help on this forum. Turns out I was being really picky. [:|] I figure changing the output tubes would affect this noise as well. Right now I have the GE6550A's. As long as they still musically sound they way they do, I will hang on to them. TG P.S. check out yo-yo ma, Edgar Meyer, Mark O'Connor: Appalachian Journey. (new post in "music/DVD) 1b sounds great. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 26, 2006 Share Posted January 26, 2006 So I just have to ask again. How loud is this noise? Quote Link to comment Share on other sites More sharing options...
Jeff Matthews Posted January 26, 2006 Share Posted January 26, 2006 Ditto on the question. Born2RockU had a lot of noise in his when he took his Power Conditioner out of the line. Although I don't have the noise issue and know nothing about Power Conditioners, I did get to see one in action, and it really did work. Quote Link to comment Share on other sites More sharing options...
aviserated Posted January 26, 2006 Share Posted January 26, 2006 Ditto on the question. Born2RockU had a lot of noise in his when he took his Power Conditioner out of the line. Although I don't have the noise issue and know nothing about Power Conditioners, I did get to see one in action, and it really did work. I am surprised no one else recommended a power conditioner sooner. I thought some of you guys were experts. kind regards Quote Link to comment Share on other sites More sharing options...
mark1101 Posted January 26, 2006 Share Posted January 26, 2006 Wait a second. [] You mean you had a humming noise on your system, at YOUR house, and couldn't figure it out. Then, you went to someone else's house and heard different equipment make a similar noise. And so.....now everything's OK???? Just want to be sure. [] Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 26, 2006 Share Posted January 26, 2006 I never mentioned a power conditioner because 99% of the time with some care and patience the noise can be eliminated without a conditioner. I good portion of the time the reason a power conditioner quiets the noise on a system is that the user ends up plugging the entire system in a common location (the conditioner) and this is the real reason it makes a difference. Craig Quote Link to comment Share on other sites More sharing options...
tgourlie Posted January 26, 2006 Author Share Posted January 26, 2006 I have a monster power "HTS2000MKII Special" line conditioner. All components are plugged into it. The other "place" I hooked up the Mac tube stuff, was at a store. 3 Deticated Furman commercial line conditioners for the room. Lighting, Audio, and Video. TG Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 26, 2006 Share Posted January 26, 2006 Man why do you keep refusing to answer a question? How loud is this noise your refering too? The Mac gear in good working order with the system setup properly you should have to stick your ear right up to the drivers to hear a thing. Craig Quote Link to comment Share on other sites More sharing options...
yaffstone Posted January 26, 2006 Share Posted January 26, 2006 You might also check the rectifier tube and high voltage capacitors. These age and make humm. There's often a coupling cap on the center tap of the filament supply. Check that as well. Quote Link to comment Share on other sites More sharing options...
tgourlie Posted January 26, 2006 Author Share Posted January 26, 2006 The noise is not that loud. I cannot hear it at the listening position, unless I really listen for it. If I have my ear at the horn I can hear it clearly. The same as the mac equipment. The speakers I had the mac hooked up to we 88db sensitivity, I thought the noise would have been the same volume if I hooked up my speakers to the Mac. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.