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New Old Stock (NOS) Russian Military Tubes for The Pan Am headphone amplifier. Provides a full, rich sonic quality with military grade durablity.
Each tube is tested with our Model 600a Hickock vacuum tube tester and is sold in pairs.
Additionally all of the upgrade tubes we offer for The Pan Am headphone amplifier have been cryogenically treated with our own Cryo-Fi treatment. This extra step reduces any sonic grain that may be present in the sonic quality of the vacuum tube.
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