Hi Audiogoner. I need your advise on what I should do now. This morning, my amplifier’s fuse has blown on the left side while listening to music. Should I change the fuse and power it back on or should the amp be checked up by a technician? Thanks for the advise if any. I have no knowledge on electronics. Calvin
From indications; that would be a good/safe idea. Did you carefully follow the manual’s re-biasing procedure, for each tube, repeating it after 30 minutes? That should have also been performed, after the glowing tube was moved.
Hello again. my amp is working as normal. The sound come out beautifully with no distortion in both channels. BUT, when I look at the amp from the front, there is one tube out of eight total glow brighter than others. I checked the old tube in that position, and figured out that old tube was bad, I can see the smokes deposited on the glass. Is it just a coincidence or do I need to bring the amp to see the tech? Thanks Calvin
Hello all, After the replacement of 8 KT-88 Reissued Gold Lions which I purchased from Upscale Audio and the KTK-1 fuse, my Conrad Johnson Premier 140 is working as normal. Thank you all who have sent suggestions to help me. Calvin
What kind of fuse ? Please remember a stock steel bus fuse can vary up to 15% in value , precision fuses like Hifi tuning Supreme Synergistic are within 1% and can blow quicker, it happened to me several times ,I go one small step up in size with a premium fuse still plenty of protection like from a 3 amp fast to a 3,125 fast blow.
What happens when the fuse blows? If one of these fuses should blow, it usually indicates a marginal output tube (one of four for each channel odd numbered tubes for the right channel, even numbered tubes for the left channel) and an attempt should be made to identify and replace it, by either (a) replacing the fuse and turning on the amp while watching the output tubes carefully; look for a bright white or blue flash inside the tube. If nothing happens, then (b) lightly tap the output tubes one by one with the plastic handle of a screwdriver while watching for flashes inside the tube. If efforts to identify the bad tube fail, the best course of action is to replace both tubes in the channel that blew the fuse. If the tubes are over two years old, or have more than 1,500 hours on them, a complete replacement tube set is probably in order.
Change the fuse and see what happens. The fuse is there to protect the unit. If it blows again, the amp won't be damaged but you should then get it checked out.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.