Need help
Salas,
I found my 26 pre-amp sound wired suddenly and the voltage on both R/L channels fluctuate quite seriously. The raw supply is stable at 172v. The LEDs are all on and I can't check the voltage reading since they keep swinging. The trimmers are working and can tune the voltage to certainly level, but jump to the extreme all in a sudden.
Regards
Albert
Salas,
I found my 26 pre-amp sound wired suddenly and the voltage on both R/L channels fluctuate quite seriously. The raw supply is stable at 172v. The LEDs are all on and I can't check the voltage reading since they keep swinging. The trimmers are working and can tune the voltage to certainly level, but jump to the extreme all in a sudden.
Regards
Albert
Last edited:
Oh....sorry, forgot to tell, mind is an old version SSHV1. Please see attached. Thanks
Attachments
George,
Thanks and I have them checked after taking out from the board so to compare. The new and the took-out ones - 350/840 - measured the same. I don't have any chance to take number when it's on. The voltage keeps fluctuating. I have 2 boards for L/R. While I set close to 150v on one side, then the other side shifted to different extreme, either very low/ or very high voltage. One thing I don't understand is when one channel voltage drops to very low, the other board's voltage go very high, even higher then the supply voltage.
Before this happened, I had 172v from the main then split to two boards. I could easily adjust to 150v without problem.
Albert
Salas,
I didn't touch it after it was up. It's my plan to add a telfon 0.047 to C2, but can't find it still.
Albert
What the value of R1? 56R for 40mA
33 R or 27R
down R1, set current CCS for all, you can get the V-out !
Not: Use current =80%, and IRF 840 = 20%.[/QUOTE]
Is it a benefit to run it too hot. What I need is 5mA per 26. It was running perfectly, but suddenly turn into this. I checked temperature for all fets and 2 legs, no sign over overheat. I didn't check the 170 yet.
33 R or 27R
down R1, set current CCS for all, you can get the V-out !
Not: Use current =80%, and IRF 840 = 20%.[/QUOTE]
Is it a benefit to run it too hot. What I need is 5mA per 26. It was running perfectly, but suddenly turn into this. I checked temperature for all fets and 2 legs, no sign over overheat. I didn't check the 170 yet.