White spark in power tube

[calmiswar]

Hello,

So I had plugged in a 6h13c as the power tube and switched the amp on. After a few seconds, I could see a white spark inside the tube.. I immediately turned the amp off.

The headphones were not plugged in because I heard a loud pop at startup the last time I turned the amp on with the phones plugged in. Thankfully the headphones seem to be fine.

Any idea what's happening here? I'm assuming the tube is faulty. Should I check for circuit damage? Would you say it's safe to run the amp with another tube?

Thanks.

 

[ianp]

I'd rerun the resistance and voltage checks to see that they are all good before trying another tube.

 

[calmiswar]

Checked the fuse, it looked fine.
Received a Tung Sol 6AS7G yesterday and put it in, amp is working fine.


I guess that tube was faulty and had started to arc.