TUNG-SOL 6550 QUAD NOS tubes,For sale four very rare 6550 tubes , Tung-Sol brand , made in USA. The tubes are pristine , NOS, the original boxes opened first time by me just for checking. These are the early version , with dar...860.00
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TUNG-SOL 6550 QUAD NOS tubes, black flat plates, original 1960, PERFECT [Expired]
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Member since February 2011
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