Two, Ken-Rad 6B4G tubes. Silver printed logo bases, dual flat black plates, smoked glass. Outstanding sonics.  The 6B4G tubes is the octal based electrical equivalent to the 4 pin, UX based 6A3.  The 6B4G/6A3 types are the electrical equivalents of the 2A3 tubes for plate characteristics, but have a 6.3 V filament, instead of the 2.5 V filament. Tested on a Hickok TV-3 military tester that has been calibrated. Firm bases, excellent silvering. Tubes are matched for structure and dynamic gain- test at 3500, 3350 where pass/fail is 1900 micromho. The tubes have the same structure inside and out, having date codes, "D4" and "C3", February 1944 and 1943, wartime manufacture.  

Many other lots of tubes for sale this week.

Shipping is free within the continental US. Elsewhere- exact postage only, no packing fee.