(!!!) (Recommended Pair) 12AX7 Triotron by Philips Holland NOS and Valvo Holland like new 1966-1968 (1.7/1.5ma and 1.5/1.5ma)

1 low noise pair) ECC83=12AX7 Triotron by Philips Holland NOS 1966 and Valvo Holland like new 1968 

1 tube) 1.7/1.5ma and Gm=2000/1900 (1966) Triotron NOS

1 tube) 1.5/1.5ma and Gm=1900/1900 (1968) Valvo like new in white box

- Heerlen Holland