6688=E180F Siemens Holland NOS gold pins 1966
8ma
Gm=12,700
(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)
– Supratek Chenin, Cortese preamp
– Yamamoto 06-3 2010
$6.60 $21.99
6688=E180F Siemens Holland NOS gold pins 1966
8ma
Gm=12,700
(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)
– Supratek Chenin, Cortese preamp
– Yamamoto 06-3 2010
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