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In Reply to: RE: First... posted by keith41 on May 20, 2015 at 10:40:24
OK Guys
plugged £15 dvd player into the mono amps and..................................yeah no distortion played perfectly, but stop playing and that low level hiss is still there ? so I swapped the L - R i/cs round and still play great but hiss in same speaker, so i then tried swapping the speaker cables from one mono amp to the other, still plays great but hiss now in the other speaker that i swapped the speaker cables too ? so what does all this mean ? cause i'm lost, yeah different source and it plays fine but when you stop the cd and listen to the speakers close up 1 of them has some hissing in it ? oh and i swapped the mains leads etc just to check.
Follow Ups:
So we now know that there is an issue with the mono amp directly connected to the hissing speaker. Swap tubes with the other mono amp. If the hissing then switches to the other speaker (i.e. follows the tubes), there is an issue with one or more of the tubes, if there is no change after doing the tube swap and the same speaker hisses, then the problem lies with the amp. This may prove a little more difficult to diagnose so let's hope it's the tubes. Cheers.
no when i switched the speaker cable at the amp end from one amp to the other amp why does it matter ?
so if the distortion has gone when using a different source then surley the cd player has the main problem yes ? as for the hissing you have to put your ear to the speaker to hear it but as the other side is totally silent it tells me there is still a slight problem and although not a big one a problem all the same, maybe the amp valve bias is out a bit or something similar ? all the same it looks like i'm going to have to send both the cd player and mono amp to the shop to be checked
ok guys I just swapped the EL34's out of the noisey mono amp and no change so then i tried the other 2 tubes, i didn't have replacements for these so i just used the tubes from the other mono amp and guess what the hiss is still there but only about half as much ? talk about confused i really would love to know what's going on ? it would seem to me that whatever is causing the hiss is based around one of the front 2 tubes i will check which one later, but i'm another step forward i guess
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ok guys
latest news is that in have spoken to the local dealer and he is going to get my cd looked at, i will get some nice new tubes for the amps and if the hiss continues then i will get the offending mono amp looked at as well, thanks for everyones help
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