(!!!) (BEST PAIR) 7247=12DW7 CBS gray ribbed plates NOS 1960 (0.9/8.8ma and 0.9/8.6ma) 1-3% matched

1 pair) 7247=12DW7 CBS gray ribbed plates NOS 1960

1 tube) 0.9ma Gm=1500 (12AX7) and 8.8ma Gm=2000 (12AU7)

1 tube) 0.9ma Gm=1500 (12AX7) and 8.6ma Gm=2100 (12AU7)

Tested on Amplitrex

12AX7 Section NOS = 0.9ma-1.2ma and Gm=1500-1600+

12AU7 Section NOS = 8-10ma and Gm=1800-2200

Recommended for:

– Fisher 400 CX-2

– Eico 2510 amp

– Eico ST-70 preamp 1961

– Ampeg SVT 1974, VT40