1 pair) 7189 Sylvania black plates NOS 1970 era - same build

1 tube) 42ma Gm=10,400 (7189 printed 7189A RCA)

1 tube) 46ma Gm=10,200 (7189 Sylvania)

 

Good NOS Ma = 40ma

Good NOS Gm = 10,000 - 11,000

 

Recommended for

Reinhardt 18W (Marshall clone), TRIODE TRV-84HD made in JAPAN, Gibson GA-5 Les Paul Junior, 65amps London head, 65amps Lil Elvis combo, Consonance Cyber 20 headphone amp, Dr. Z Carmen Ghia 2005, 2006, Leak Stereo 20, Lafayette LA-224A, VOX AC10, AC15, AC30, LEBEN CS-300XS, Lexicon Signature 284, Epiphone Valve Junior, Shindo Montille, Ming Da MC 84C07 headphone amp, Manley, RM10, Marshall EL84 amp 1974, Matchless C-30, C30, Elk Sonic 102 Japanese copy of a Fender Vibrolux