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Preamp tubes

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(!!!!) (BEST SINGLE #2) 2C51=396A=5670 GE NOS

(!!!!) (BEST SINGLE #2) 2C51=396A=5670 GE NOS "D" getter gray plates 1960 era rebranded National 1970's (8/7ma)

$ 41.99
(!!!!) (BEST SINGLE #4) 5670=2C51 GE NOS

(!!!!) (BEST SINGLE #4) 5670=2C51 GE NOS "D" getter 1950's rebranded National 1970's (8.6/6.2ma)

$ 34.99
(!!!!) (BEST SINGLE #5) 5670=2C51 GE NOS

(!!!!) (BEST SINGLE #5) 5670=2C51 GE NOS "D" getter 1950's rebranded National 1970's (6.8/10.6ma)

$ 34.99
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