seanrr
Well-Known Member
I have a pair of Antique Sound Labs 1006-845 DT mono block amps. They have been heavily modified by a former owner, and they sound fantastic. I have been using the 845 tubes that came with it, but I have been thinking to upgrade my tubes for awhile. Rather than dish out $800 for the ones I would really like, I took a chance on some used ones (claimed to have been used for only 10 hours) off of eBay - these are Golden Dragon Premium and look pretty much like Shunguang 845B tubes. I popped them in yesterday when they came, but I was only able to flip the amps on this morning. Without listening to the amps, I found that it was difficult to get one of the two tubes in a bias range below 800. I believe 800 is recommended for the amp, which has a digital bias meter. Dialing the bias all the way back only brought me to about 815. Does this suggest a problem with the tube? Would it be dangerous to drive them at that bias? If not, should I put both amps at the same bias (around 815)?