Tung-Sol 6B4G, dual mono plate construction.

One has faded secondary label and glued base. 

Test NOS at 4600 (55 ma) & 4500 (66 ma) where 2200 is good in Triplett 3444/Westmore 501 laboratory tube analyzer, restored and calibrated by Paul Hart.

All tubes are guaranteed good or may be returned.  

Shipping includes insurance.

We cannot be responsible for what tubes test in another tester.

Please see our other items for more vintage tubes & audio.

We combine orders for shipping.

We do not change values for customs.  

Thank You.