Put a cheap fuse in and retry, worst to happen is it will blow it again, then call the tech.
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Straight from the CJ Premier 140 manual:
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.
If it was a fault in the fuse.
You must check at least with a meter or any signs of damaged components, likely resistors or whether any tube is bad.
Likely, a tube or more has shorted. This takes out some other components around the faulty tube and this short will take out the fuse.
There is only a very small chance it will work by just replacement, lest the time the new fuse blown again, can take out more components.
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.
my amp is working as normal. The sound come out beautifully with no distortion in both channels.
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?