6688=E180F National UK black plate NOS unknown maker (14.2ma)
By Tube World
$ 13.99
6688=E180F National UK black plate NOS unknown maker
14.2ma
Gm=14,000
(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)
- Supratek Chenin, Cortese preamp
- Yamamoto 06-3 2010
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