1 low noise tube) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966

Gm=1500 (1.0ma)

Gm=1400 (0.8ma)

Good mA = 0.9-1.0mA+

Good Gm range = 1500-1600+

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