6688=E180F Philips Miniwatt Holland SQ gold pins used/good 1966 (8.8ma)

6688=E180F Philips Miniwatt Holland SQ gold pins “”D”” getter used/good 1966

8.8ma

Gm=11,400

(10,000 hour 9-pin frame grid broadband Pentode, variant is 7737)

– Supratek Chenin, Cortese preamp
– Yamamoto 06-3 2010