(!!!!) (Best Overall Pair) 7247=12DW7 Mullard UK NOS rebranded RCA 1972 (1.2/11.5ma and 1.2/11.4ma) 1% matched

1 low noise pair) 7247 Mullard UK rebranded RCA NOS 1972

1 tube) 1.2ma Gm=1700 and 11.5ma Gm=2200

1 tube) 1.2ma Gm=1700 and 11.4ma Gm=2200

Tested on Amplitrex

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

12AU7 Section Good = 8-10ma Gm=1800-2200+

Recommended for:

– Fisher 400 CX-2

– Eico 2510 amp

– Eico ST-70 preamp 1961

– Ampeg SVT 1974, VT40

– Quicksilver silver sixty mono amps

– SWART amp (vibroto/tremolo)

– SWART Atom (2012)

– Eico 2036 amp

– Li”l Dawg Amps