Description
(!!!) (Best Mullard Single) 6688=E180F Mullard branded Philips SQ gold pins NOS 1971 (17.5ma)
6688=E180F Mullard branded Philips SQ gold pins NOS 1971 (17.5ma)
17.5ma
Gm=19,500
(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)
– Supratek Chenin, Cortese preamp
– Yamamoto 06-3 2010