Audio Tubes

Matched Pair (2) NOS GE 6550A Tubes Tested / Guaranteed Full Output This Matched pair was sold by Antique Radio Supply as a NOS pair so I assume they are NOS, and they test like NOS. This tube and...

Matched Pair (2) Set of NOS Tung-Sol 6550 Tubes Tested / Guaranteed Full Output This Matched Pair set (2) 6550 tubes were made in Russia and they are NOS. They test like NOS, and have the factory...

Matched Quad (4) Set of NOS Tung-Sol 6550 Tubes Tested / Guaranteed Full Output This Matched Quad set (4) 6550 tubes were made in Russia and they are NOS. They test like NOS, and have the factory...