..... from my recent eBay BIN Offerings of 5 GE 6550 tubes.
TV7-U tested, one tube tests at "48" and the second tube "46", with 44 being the minimum .
Shipping is a flat $6.00, to the USA only. I combine shipping on multiple purchases.
See the other eBay offering of an also-tested nicely priced GE 6550s. You MAY click on
Sellers other items, top of this posting - on the right side .