(!!!!!) (Best Pair 1971) 12AX7=ECC83 Philips Holland ribbed plates "O" getter halo NOS 1971 same date codes (1.4/1.4ma and 1.5/1.5ma) (close Gm)

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