Metropoulos Forum

Playing my JTM45 and the sound faded out like I just switched it off.

Checked the tubes and one of the KT66s was not glowing, powered off the amp and pulled the tubes.

It appears the vacuum had failed on one of the power tubes. Original valve arts that came with the kit.

Popped in a couple of new Sovtek 6L6WXT I had and powered back on.

Everything lights up fine but no sound

Before I start pulling things apart what are the like culprits component wise ?

What’s the chances on losing th OT with a power tube failure

Cheers

bg

If it just fade out and no smoke i wouldnt worrie too much.
Did you replace the fuse? Also bias the new tubes.
If that check fine and there is still no sound, i would check voltage from the build instruction.

More specifically the HT fuse. The light and heater filaments will still glow when the HT fuse is blown. The fuse may "look good" but replace it anyway.

Cheers,

Good call on the fuse.

Its a relief to have those speakers shifting air again.

bg