I purchased this pair of "British Made Mazda 6CG7/6FQ7 Platinum Grade" from Upscale Audio for $90 in Feb 2013. Tubes were tested and their pins were polished by Vintage Tube Services in Mar 2015 and have since been displaced in my Premier 11 by RCA tubes. Tubes are estimated to have a few hundred hours on them based on my pattern of listening to music a couple hours per week. The eBay item number is 321833024484.
The bidding starts at 1 cent + USPS Priority Mail Small Flat Rate Box.
Just enter the eBay item number on eBay to search for posting.
Hopefully, someone can make good use of these...