I have some nice Philips E88CC/6922 SQ tubes that are between $90 a pair and $110 a pair, depending upon how strong the logos are. A picture of 3 pairs is attached.
All tubes were manufactured in the Amperex Herleen Holland factory in the 1960s.
$90, $100, and $110 a pair, from left to right. I have another $110 pair with full logos in transit. I also have a nice single for $45.
Tubes were tested for emissions on my Sencore TC-162 tester, where 70 is the minimum 'GOOD' reading. All tubes tested 100 or better.
Tubes were also negative for shorts and grid leakage.
I can provide test results and factory codes for specific tubes upon request.
Add $3 for USPS 1st Class or $5 for USPS Priority Mail to USA.
Let me know if you have questions.
Thanks for looking.