Blank Label. From Industrial Buyout.

Tests 2950/3250 where 1640 is good on a 539-B calibrated by Paul Hart.

Listening tested for excessive noise and microphonics in a MAxi-preamp 2 noise tester.

All tubes are guaranteed to test good for gm or may be returned for a full refund.

Please see our other items for more vintage tubes & audio.

We combine orders for shipping.

We don't change values for customs.  

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