(!!!) (Recommended Pair) 6BK7B Tungsol black plates NOS "O" getter 1960's (7.5/8.6ma and 8.2/9.4ma)

1 pair) 6BK7B Tungsol black plates NOS "O" getter 1960's
1 tube) 7.5/8.6ma Gm=5400/5700
1 tube) 8.2/9.4ma Gm=6100/6400

Matched 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