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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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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. |
#2
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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 |
#3
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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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