Yesterday morning I turned on my system (BHK pre and BHK300’s) and one channel didn’t work. After troubleshooting I discovered one of the fuses next to the IEC had blown. (Kinda strange because it worked fine the night before) I replaced the fuse and all the lights came on and the the tubes started to glow, but I still have no sound out of the amp. I checked all the rest of the fuses and the speaker cables. I know it’s not my source and I’m pretty sure it’s not the preamp. ( switched the XLR cables and it still didn’t work and I plugged in some headphones and they worked fine.)
Any thoughts?
Question,
What would happen if one of the tubes went bad?
Thanks I. Advance.
When you say you “checked all the fuses”, did you include the fuses that are internal to the BHK 300 or just those accessible from the rear panel? The fact that replacing the rear panel fuses gave a partial fix suggests to me that your missing channel didn’t like something it was subjected to. One or more of the internal fuses may have blown as well.
There are more fuses inside? You mean six isn’t enough?
Thank you for your reply. I never thought there’d be more. I’ll check it out later today.
Thanks again!
Jim
Hi Jim - if you’ve verified six already, you should be good. I’m not aware of any others. Some folks are unaware of the total and I just wanted to be sure you’ve ruled out all of them.
Another suggestion is to remove and swap or reseat your preamp tubes. I say “or” because you’ve already tried swapping the XLR cables and apparently the problem didn’t move.
Lastly, try the same technique with the tubes in the problematic BHK 300.
What internal fuses? I can not find any. Please tell me where they are?
Jim
My bad. All six are accessible from the rear panel. I sold mine several months ago and was going from memory - always a dangerous proposition for me.
Try reseating the tubes.
If that doesn’t help, try swapping the tubes in the working 300 for those in the problematic 300 and see if the problem moves.
If that doesn’t work, try reseating the preamp tubes.
If still no success, it’s time to contact PS Audio tech support.
Yes, @CuriousJim make sure that both tubes are removed so that no tubes are connected to the preamp. Give it good 10 minutes before putting them back in.
1 Like