A number of people have recommended that I try some Tung-Sol tubes in my LD 1+, so I ordered a pair each of JTL 6AK5s and 6AJ5s, 1950's vintage. Upon rolling them into my LD, both pairs exhibited a significant ground hum. It is the kind of hum that is of a constant level independent of the volume setting. Has anyone else experienced this? Has anyone found a credible explanation? And should I assume there is no remedy? Thanks in advance!
I tried cleaning the pins thoroughly, but heard absolutely no improvement and had given up. However, at a recent Head-Fi meetup, I met a guy with years of experience with tube amps. When I told him about these tubes, he suggested that I simply burn them in for several hours. And it worked! I ended up burning in the Tung-Sol 6AK5s for a total of 8 hours! But they are now very quiet and sounding exquisite! Thought I would pass this information along on the chance that it might help someone else.