SWR SM 900 intermittent noises
When I hit a certain a certain frequency, it is followed by a distorted
sound. Also certain notes have a vibrato like sound. I have eliminated all possibilities but the amp. I am wondering if it may be the filter caps or if anyone has any ideas. Thanks. |
SWR SM 900 intermittent noises
wrote in message oups.com... When I hit a certain a certain frequency, it is followed by a distorted sound. Also certain notes have a vibrato like sound. I have eliminated all possibilities but the amp. I am wondering if it may be the filter caps or if anyone has any ideas. Thanks. I think I am correct in that this amp has a tube (valve) front end ?? If so, the tubes themselves would be my next suspicion, as such resonances can occur as a result of loose electrode structures. Is the problem affected by how loud the unit is turned up ? If so, could be a power supply problem. This amp has pretty meaty output stages, and poor power supply regulation could lead to problems with the front end. I think that the next place I might be going after that, is to try to set up the problem with a signal generator. It should then be fairly easy to track it down with a 'scope. Arfa |
SWR SM 900 intermittent noises
Thank you Arfa. I did change the tube, but I will try another one. I
don't have a scope or signal generator, so hopefully it is the tube. I was considering replacing all the filter caps but if it is not the tube I might be better off taking it to someone. Thanks again. Arfa Daily wrote: wrote in message oups.com... When I hit a certain a certain frequency, it is followed by a distorted sound. Also certain notes have a vibrato like sound. I have eliminated all possibilities but the amp. I am wondering if it may be the filter caps or if anyone has any ideas. Thanks. I think I am correct in that this amp has a tube (valve) front end ?? If so, the tubes themselves would be my next suspicion, as such resonances can occur as a result of loose electrode structures. Is the problem affected by how loud the unit is turned up ? If so, could be a power supply problem. This amp has pretty meaty output stages, and poor power supply regulation could lead to problems with the front end. I think that the next place I might be going after that, is to try to set up the problem with a signal generator. It should then be fairly easy to track it down with a 'scope. Arfa |
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