6688=E180F National UK black plate NOS probably made by Amperex (9ma)
$ 12.99
6688=E180F National UK black plate NOS probably made by Amperex
9ma
Gm=13,200
(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)
- Supratek Chenin, Cortese preamp
- Yamamoto 06-3 2010
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