valve problem?

[philv]

Are you using a socket convertor?

Yes.

OK....i understand now about the dual triode part.
Thanks.

[enrae8]

I used a socket converter - they are highly recommended valves for the Glass FX - the Jolida importer at the time Highly recommended them - perhaps he'll comment here if he comes across the thread - or perhaps PM him -OpenDoor on here Robert is a great guy to deal with

[enrae8]

Ignore me - I think I've got the wrong end of the thread

[Blackdog]

Yes.

OK....i understand now about the dual triode part.
Thanks.

Now I get it. They should have worked. Just bad tubes.

[Open Door]

A suggestion to try

Usually NOS 12AX7 type tubes have thicker pins than new issues. The 5755 adaptors have quite thin pins in comparison. So if they are replacing NOS tubes, there could be bad contact. Try move/shift the 5755 tubes (in their adaptors) gently when in the dac to see if that makes better contact and eliminates the problem.

5755’s are usually extremely reliable.

[Lawrence001]

A suggestion to try

Usually NOS 12AX7 type tubes have thicker pins than new issues. The 5755 adaptors have quite thin pins in comparison. So if they are replacing NOS tubes, there could be bad contact. Try move/shift the 5755 tubes (in their adaptors) gently when in the dac to see if that makes better contact and eliminates the problem.

5755’s are usually extremely reliable.

I had a problem with a valve socket years ago, I thought it was a faulty valve crackling but another one has the same problem and it was worse when I wiggled it. I used a pin to force the metal grips tighter in the sockets and the valve was good after that.