So, here is what I just sent to Jim Clark.
"So, my question has been on the 350 mono blocks. In one part of the ad the DC restorer tube is listed as 6AL5 and in another section as a 6AT7 tube in the same position. I need to replace mine so, I am not sure which to use. Are they substitutes?
There has been no answer from the Carver website, phone numbers, or by you for several weeks until now when I responded to your recent ad on AudioMart."
Not a lot of confidence.
ozzy