Well used pair of grey glass, early 50's.
Test fair - good for gm 1800/2600 & 2200/2650 where good is 1640 in a calibrated Hickok 539-B.
Test fine for gain at 18.8/19.9 & 21.7/22.0 (nominal is 19)
Listening tested for excessive noise & microphonics in a Maxi-preamp 2.
All tubes are guaranteed good or may be returned.
Shipping includes insurance.
Please see our other items for more vintage tubes & audio.
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