1 low noise pair) 12AX7=ECC83 Philips Holland ribbed plates "O" getter halo NOS 1971 same date codes

1 tube) 1.4/1.4ma Gm=1900/1800 

1 tube) 1.5/1.5ma Gm=1900/1900 

Good NOS Ma = 1ma+

Good NOS Gm = 1600+

- sweet sounding 12AX7

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