1957 RCA 5963 12AU7 ECC82 Foil Getter Tubes - Matched Pair, Test NOS, Matched Codes

1957 RCA 5963 12AU7 ECC82 Foil Getter Tubes - Matched Pair, Test NOS, Matched Codes

These tubes have long (17 mm) gray plates, foil getters and have matching 1957 date codes. These tubes were made for Hewlett Packard for use in their equipment.

These are NOS testing tubes.

These were tested on my calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test very strong with readings of 102/98 and 100/105 where min is 56.

They have also been checked for noise and microphonics in the phono stage of my DIY pre-amp and are dead quiet.

I will ship international. 

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