6688=E180F National UK gray plate NOS probably made by Amperex (16ma)
By Tube World
$ 17.99
6688=E180F National UK gray plate NOS probably made by Amperex
16ma
Gm=14,100
(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)
- Supratek Chenin, Cortese preamp
- Yamamoto 06-3 2010
See more: vacuum tube
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