6688A=E180F Mullard branded RCA gold pins NOS 1973 (17.5ma)
By Tube World
$ 15.99
1 tube) 6688A=E180F Mullard branded RCA gold pins NOS 1973 printed in 1975
17.5ma
Gm=17,100
(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)
- Supratek Chenin, Cortese preamp
- Yamamoto 06-3 2010
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