Matched Pair, Matched Construction, Grey Plate, Clear Top, Halo Side Getter.

These test Gm 6250/5250 and Plate Current Milliamps 52/57. Minimum Gm is 3300.

Tested on a calibrated Hickok 539B.

My tubes are marked with documented identifiers to prevent false return claims.

Shipped carefully packed, fully insured via USPS.

30 day guarantee on defective tubes.

Always free return shipping.