I have a pair of these NOS Mullards ECC82 6189 boxed tubes on hand that was given to me from my father who bought these way back when first hand from an audio store as spares for his tube amp. Weird thing about these, is that they don't have the logo on the tube itself, but they look identical...

Hi all, I've recently started to notice issues with my Darkvoice 336SE while using my speakers with it. The right channel is producing a slightly lower volume than the right. What's also interesting is that the right channel doesn't seem to be producing any bass at all. Only mids and highs...