$150 shipped CONUS. Any form of payment is fine.
The holy grail 6550. Black Plate with 3 top D getters. This one is in great shape. Looks barely used and tests new on my calibrated TV-7.
Tests at 72 and tests higher than any new production 6550/KT88 I have ever tested. Most new 6550/KT88 tubes check at about 66 on this tester.
I amp tested this tube as well, with 500V on the plates. Biased up just fine and played for a few hours. It is good to go with no surprises!
