1 low noise tube) 12AX7=ECC83 Mullard UK old logo copper grid posts used/good (161-B3B1=1963) in white box

Gm=1500 0.9ma

Gm=1500 1.0ma

Good used Gm range 1400-1600

Recommended for

- EAR 834P
- EAR 864
- Aestetix Rhea phono
- Aestetix Calypso, Io phono
- Art Audio phono
- Audio Research linestage
- Shindo linestage
- Jolida 1000 CD player
- CAT SL-1 Signature Mark III preamp
- Fender Pro Reverb 1967
- Pathos Acoustics T.T. Hybrid Integrated amp (INPOL)
- Belari 129 phono

- Art Audio MPA Gold pre
- Fender Tremolux 1963
- Jolida