HT Club 40 Mkii clean channel preamp tube swap problem

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Stugatzo
Posts: 3
Joined: Sat Dec 08, 2018 12:44 pm

Fri Apr 12, 2019 11:48 pm

Hi all:
I'm an experienced tube swapper but this has me baffled.
In my Ht Club 40 Mkii, i'm trying to replace the clean channel pre-amp tube but it simply will not work with completely fine tubes.
I remove the Sovtek 12AX7WA that's in the socket, and replace it with a 12AX7 tube i know to be working (and I tried at least four of them) but i get no sound.
I can use any of those tubes in the dirty channel socket and they all work fine.
I put the Sovtek back in the clean channel socket and PRESTO - I get sound!

Has anyone experienced this before and what was the fix?

I want to experiment with a Tung Sol or Ruby 12AX7 and i appear to be stuck with the stock tube.
So strange!

mrtoad
Posts: 3
Joined: Tue Jan 08, 2019 12:57 am

Sun May 05, 2019 7:46 pm

That's strange. I put Tungsols in both channels after the TAD died in the OD channel after 9 months. My clean channel came with a Ruby 12AX7. No problem whatsoever and the Tungsols sound great. Try cleaning the contact pins on the new tubes. Good luck.

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