Bad news for a dr103

[marwatt]

last night my amp had a strange behaviour...
symptoms:
the volume fade away... after few moment come back to life... after another few moments the volume goes away again or stay with a little volume.
Can anyone point me in the right way?
the power tube gone?
the phase inverter tube gone?
the bias voltage instable?
any guess?

thank you in advance

[OldSchoolDave]

Sorry to hear your DR103 is ill.

Have you switched impedence lately? I've had dirty contacts on the impedence switch cause the signal to cut in and out.

Just a thought (hoping it's something simple).

Dave

[mhuss]

It definitely can't hurt to remove and re-seat the selector plugs and all the tubes in their sockets.

--mark

[marwatt]

I have never removed the impedance selector.... I try to remove and replug the selector to eliminate some dirty..
Idem with power tubes.... let you know...
Thanks