On Friday afternoon I made the mistake of turning off my preamp before shutting of the BHK amp and got a moderate thump. When I turned everything back on I saw that a rail fuse had blown (left channel lower position). I got replacements today from Amazon and now on turn on one of the two rail fuses on the left side keeps blowing. Sometimes it’s the upper one, sometimes its the lower one. Any ideas? I think I’m screwed. 
Just spoke to my dealer, Steve at High Performance Stereo. I’ll see if Jeremy or Paul weigh in here. If not Steve suggested calling Jeremy tomorrow to see if PS thinks it’s something High Performance can fix, or whether it has to go back to Boulder. Thank goodness I kept the box.
Hopefully it’s not something major and it can be resolved quickly. Figures, I just ordered Synergistic and Hi-Fi Tuning fuses for it that arrive on Wednesday. A little Gift of the Magi thing going on.
It doesn’t sound good - though I am surprised at this chain of events. Please do call Jeremy on Monday and of course, if there’s anything wrong, it’s up to us to fix it. I apologize for the trouble.
Thank you Paul. Have had the amp for 18 months now I think. Never an issue. Not one. Just music.
I was swapping cables in/out on Friday when this happened. No sound left channel. Went around to the rack to look at the amp from the back and saw a red (blown fuse) light was on. Left channel, lower LED. Didn’t have any 10AL slo blow fuses so I ordered them from Amazon. They cam this afternoon. Replaced the blown one, top left channel fuse blew. Replaced the top left fuse, bottom left blew. Tried one more fuse, it blew and then I called Steve. He’s been a friend of mine for 20 years and I got all my PS gear from him.
He said to contact you guys and we’ll figure out whether it’s something his tech can fix or whether it goes back to Boulder. I’ll call Jeremy tomorrow and am seeing Steve on Wednesday. He’ll either fix it there or will send it back to you on Wednesday. Hopefully it won’t be down for too long.
Happy Holidays,
Ian
A+ customer service. 
Paul agreed to repair the amp free of charge. It’s on its way back to Boulder. Duncan suspects some blown transistors but won’t know for sure until they get it open. It figures that $500 worth of upgraded fuses I purchased for it arrive tomorrow. Oh well.
Hopefully it won’t be on the sidelines for too long. Props to Paul and team. 
Given that this topic is on fuses, I wanted to request a bit of basic help - Fuse 101 - in selecting fuses for my new BHK250. The manual references three different types of fuses for the amp, differentiating between 100v, 120v, and 230 v countries. Which is correct for the U.S.?
In terms of the fuses themselves, I’ve found several sources online (Parts Express, Grainger Industrial, CableCo., Fuses Unlimited). Does anyone has a source recommendation? I’ve found fuses ranging from a few dollars to well over $100 each. Any viewpoints here would be appreciated.
Additionally, I’ve seen questions on the forum relating to the direction that the fuse is to be inserted. Is this an issue and if so, how is it properly addressed?
Thanks.
roadsterluver saidGiven that this topic is on fuses, I wanted to request a bit of basic help - Fuse 101 - in selecting fuses for my new BHK250. The manual references three different types of fuses for the amp, differentiating between 100v, 120v, and 230 v countries. Which is correct for the U.S.?
In terms of the fuses themselves, I’ve found several sources online (Parts Express, Grainger Industrial, CableCo., Fuses Unlimited). Does anyone has a source recommendation? I’ve found fuses ranging from a few dollars to well over $100 each. Any viewpoints here would be appreciated.
Additionally, I’ve seen questions on the forum relating to the direction that the fuse is to be inserted. Is this an issue and if so, how is it properly addressed?
Thanks.
The suitable fuses for US are those for 120V mains.
All the main online shops mentioned above are good sources for fuses. I’d add some others like PartsConnexion and VHAudio.
jomal
I’m finding the fuses at these various sites in terms of size (5x20), amps, slow/fast blow, etc., but the voltage is consistently rated at 240v. Should I keep looking for 120v rated fuses? Thx.
roadsterluver saidjomal
I’m finding the fuses at these various sites in terms of size (5x20), amps, slow/fast blow, etc., but the voltage is consistently rated at 240v. Should I keep looking for 120v rated fuses? Thx.
Hi, roadsterluver. When I said “for 120V mains” I meant amperage. The BHK 250 webpage (BHK Signature 250 Amplifier – PS Audio) states the need of four 10 A fast blow H-Rated 5x20mm rail fuses plus one 1.6 A and one 10 A slow blow H-rated 5x20mm too, ie, a total of 6 fuses.
The 240v fuse rating is normal (even in the US). As Jomal said, what you want is the proper amperage, size, and fast or slow blow, as specified by PSA for 120 volt units.