Sound faded away from one channel / High voltage readings on Crack [resolved]

[kattjaevel]

No, still only the bottom half of the 9-pin tube glows. I'm quite certain that these connections are solid. They didn't budge at all no matter how much I tried moving them before soldering and the physical connection between the pin and wire was solid. I'll try with another 12AU7. Thanks.

In the meanwhile, is there anything else in the chain that could be causing these voltage issues or is it because the 12AU7 doesn't "draw" any current? Could for example my A-socket pins have been pulled out so that they don't connect to the tube any longer? Can I measure something like that? I tried shining a flashlight down the sockets and saw nothing apparent that would be the issue of the sort, but guess I might as well ask an expert. Appreciate all the help

 

[Paul Birkeland]

If only one half of the 12AU7 is heated, then only half the tube will operate, and you'll get flawed voltage measurements and no sound out of that channel.  That's the impetus for focusing only on that and not looking for problems elsewhere.

 

[kattjaevel]

Well, the 12AU7 finally arrived in the post. Swedish postal service at it's finest, 3 week delivery... anyways, I installed the new 12AU7 and redid resistance and voltage measurements, everything works now