Tube amp down, need guidance from the experienced


I listened to my McIntosh MC275 Mk.IV all day yesterday without issues, as usual. Today I turned it on and left the room. Didn't pay attention at startup. Ten minutes later I realized it was not on. Eventually I figured the fuse had been blown, and replaced it. Turned it on again and found one KT88 was not glowing and cold. The rest of the tubes, both small signal tubes and KT88, were all on. Didn't attempt to play anything, turned it off, and here I am.

Obviously I need to replace the KT88, preferrably all of them. Unfortunately I don't have any spares on hand. What I'm anxious about, though, is to figure out if anything else was damaged. Is there reason to believe something else might have been damaged when this tube went off? First time a tube fails for me, and have seen a number of horror stories told on the net.

Thanks much!
lewinskih01

Showing 2 responses by truemaineiac

Ah, the worry of a tube amp owner, your days of carefree listening are over when you get a tube amp. Anyway, I had a vac avatar super that used kt88 and I have had a tube go bad and take out the resistor along with it as hi-fi geek mentions and I have also had it where just the tube went. It depends on how long you have used the tubes, if you are close to the beginning I would replace with a matched one and keep going, but if you are past the mid-way mark, it might be better to replace the entire set. Unless the resistor is really gone you should be ok. I think I might be over protective but I don't leave the immediate vicinity with my tube amps left on. Let us know how you make out.