6J5G Sylvania engraved base black oval plate used/very good 1930”s

8.0ma

Gm=2700

Good Ma 7-10ma

Good Gm = 2400-2600

Recommended for

– Audio Note monoblocks
– Audio Note Quest mono amps
– Berning Siegfried
– Tektron preamp and amp
– New Audio Frontiers Absolute MKII preamp