(!!!) (Recommended Single) 6BK7B Tungsol gray plates NOS 1960”s (8.0/9.8ma) (great sub for 6N1P)

6BK7B Tungsol gray plates NOS 1960”s

8.0ma Gm=5600

9.8ma Gm=6200

Tested on Amplitrex

Good Ma range 6-8ma

Good Gm = 5000-6000

(also see 6BZ7 and 6BQ7A, sub for 6N1, 6N1P)

– Modwright Transporter
– Schiit Lyr amp 2011
– Don Allen
– Donald North Audio (DNA) Stratus