(!) (Recommended Pair) 12B4A Sylvania NOS 1960's (26ma and 27ma)

1 pair) 12B4A Sylvania NOS 1960's same build in white boxes
1 tube) 27ma Gm=5800 (red printing)
1 tube) 26ma Gm=5800 (white printing) ITT

Matched on Amplitrex

Vplate=140

Vgrid=-15V

Good Ma range 25-40ma

Good Gm = 6000

- Mapletree Ear+ Purist Headphone amp
- Mapletree Audio Design Ear+ Purist HD 2007
- Ultra-Fi linestage
- Graham Ingle, Black Cat Electronics
- Experience Music DHT