Tubemiester 18 keeps blowing anode fuse

[Sinster]

I've replaced it and as soon as I come out of standby the fuse blows. The tubes all glow. I have turned off the speaker and tried another cab and fuse still blows. I even pulled the power tubes and still the same thing. Besides the transformer would the pre-amp tubes blow the fuse. I'm assuming it's the anode as I found a few sites of people having the same issue, but no solution.

 

[Scooter2112]

Years ago, I had the same thing (and same fuse) happening on an Egnater Rebel, so I had an electronics whizz friend take a look at it. When he opened it up, the only thing out of the ordinary is that it had a blown diode.

IIRC, the circuit was constructed as such that this diode was in place to prevent a ground/ short circuit in the high voltage section of the circuitry. A condition that didn't seem to be of good design at the time. Replacement with a higher rated diode has kept it trouble-free since.

Not sure if that is relevant to your problem or not, but just thought I would explain a similar instance in the event that it may be helpful.

 

[SteveGangi]

I would suspect a bad filter capacitor, a burnt resistor (sometimes instead of burning open they lose resistance for a while), or the diode that Scooter mentioned. A part that is wired from "hot" to ground. Something is making the fuse blow.