Tested on a Hickok 6000A. Average new = 3000 Minimum = 1950 (65% of average new value).
Tube 1 - 3100 / 3000 VF3 B0I1
Tube 2 - 3900 / 3700 VF3 B1J4
Tube 3 - 3100 / 3300 VF3 B0H4
Tube 4 - 3250 / 3250 VF3 B1J4
All marked Gt. Britain.
Price shown is per tube.