Official Blackstaramps Forum

I had that same problem and it turned out to be a bad screen resistor. Don't know what caused it though, maybe a bad tube.

I think that’s the way it’s designed. Mine does the same. Really great if you want loud and clean.

I see the new HT Club 40 Black and Blue using 6L6 tubes. Can I swap out the EL 34's in my HT Club 40 MK II for 6L6's? Has anyone tried this?
Thanks

Try swapping preamp tubes.

Sounds like a pre-amp tube. Same thing happened to mine after 9 mos. Try swapping the two smaller tubes. (amp off and unplugged of coarse) If the problem switches to the other channel then just replace the tube. No biasing or anything else necessary.

For all you tube swappers, I tried the Tung Sols in both position. Not much better than the originals. But then I put a TAD 7025WA Highgrade in V1. Much nicer tone. Hard to explain but even my wife noticed it. She has a very good ear for music even though she doesn't play an instrument. I guess list...

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.

I found my answer after talking to a Blackstar engineer. The ground does float at 100 ohms.

My new single coil equipped guitar is buzzing but goes away when you touch the strings. I checked the ground on the guitar and it is good. Don't have another amp to try it in. I measured resistance from the cable ground (plugged into the amp only) and the ground lug where the power cable plugs in. I...