aspguitars
New Member
- Joined
- Jan 31, 2012
- Messages
- 53
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Hi! guys,
could do with a bit of help here. I've got an old JCM 2000 DSL 50 that doesn't work. I took all the Tubes out and had them tested by an old valve guy that I know, and both of the Power Tubes (EL34's) proved to be faulty, the other 4 pre amp ones were good. I have now replaced all 6 of the valves as I thought this to be good practice, but still no sound. The Power Valves all seem to be OK, the heaters are all lit up as they should be. The ECC83's although warm do not seem to be glowing as I would expect them to. I checked the Bias and the most that I can get is about 13.8 mV which I believe should read about 40-45mv.
I did suspect the Bridge Rectifier as apparently they do sometimes break down, so I've replaced it and it has made no difference. Not sure where to go now guys?
Any help would be gratefully accepted.
P.S. I did the output socket mod on the 16 ohm output as recommended, but still nothing. However if I plug the speaker into the 16 ohm socket I get a strange crackly echoey type of sound but still very low volume.
Ade
could do with a bit of help here. I've got an old JCM 2000 DSL 50 that doesn't work. I took all the Tubes out and had them tested by an old valve guy that I know, and both of the Power Tubes (EL34's) proved to be faulty, the other 4 pre amp ones were good. I have now replaced all 6 of the valves as I thought this to be good practice, but still no sound. The Power Valves all seem to be OK, the heaters are all lit up as they should be. The ECC83's although warm do not seem to be glowing as I would expect them to. I checked the Bias and the most that I can get is about 13.8 mV which I believe should read about 40-45mv.
I did suspect the Bridge Rectifier as apparently they do sometimes break down, so I've replaced it and it has made no difference. Not sure where to go now guys?
Any help would be gratefully accepted.
P.S. I did the output socket mod on the 16 ohm output as recommended, but still nothing. However if I plug the speaker into the 16 ohm socket I get a strange crackly echoey type of sound but still very low volume.
Ade
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