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DT25 - No sound but power on - Tubes?

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Hi guys,


yesterday i was playing at home, in low volume mode.
While i was writing an sms on my iPhone, the volume knob of the guitar was turned down, i started to hear a hum noise from the amp (like a power hum) for like 6 seconds or so, then a pop sound (not so loud honestly)
then, no sound came out no more from the amp.

I tried to turn it off and on again, tubes seems to be as always (as i can see) on and lighted, don't see any difference in luminance between them...

Anyway the amp turns on normally, i can change all the parameters, class, triode, voicing, everything seems to be normal except the sound that is not coming out.

I bought it used 4 months ago and these tubes are on for a year i guess, could this be a problem caused by old/died tube/s ?

I have a pair of new tubes same model, but don't have a multimeter to check the bias voltage...but before changing the tubes i would like to calm down and assume that old tubes can cause this kind of problem.

What do you guys think?

Thank you. 

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Changed tubes, cannot bias because it showed me 1 on the tester...

So i saw that also the tube protection fuse was died, changed it, biased.



Very happy 😜😜👋ðŸ»ðŸ˜˜

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