2. amps-preamps
  3. 186564-17425

Can a tube short without blowing?

Loud pop, the left channel went silent.  All tubes in the integrated amp remained lit and appeared to be normal.  The left channel tube fuse had blown.  Can a tube short and cause a fuse blow but without causing the tube to fail?  It is probably just a bad fuse but I’ve never had a fuse fail without a cause after initial startup (e.g., first 20 hours).   There are 125 hours on the Cary SLI-80HS integrated amp now.

‘Also, can a preamp section tube at EOL cause something like this? After the first 100 hours of run-in I replaced the 6922 tubes with a pair of beloved NOS tubes with many hours on them. They also remained lit throughout the event.

txp1

Showing 1 response by paulcreed

paulcreed
539 posts
 

I had a Mullard xf2 with maybe 1000 hours glow bright red and left channel went out. Opened amp up it was a blown fuse. Did not have extra fuses so called Conrad Johnson to order some.
 

What shocked me was CJ told me to put the same tube back in that red plated when I get fuses in, spayed tube most likely still good. This was a little shocking I asked them a few more times are they sure this can’t be. My fuses came in put bad tube back in and it has been running just fine for last year or so. To this day I still don’t understand but all I know is I didn’t have to buy a new tube,

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