(!!!!) (Recommended Single) 7199 RCA black plates NOS 1960's (12ma pentode / 6.6ma triode)
By Tube World
$ 87.99
7199 RCA black plates NOS 1960's
12ma Gm=6500 (pentode section) good
6.6ma Gm=1750 (triode section) good
Tested on Amplitrex:
Good Pentode Section 10-12ma Gm=6000-6500
Good Triode section 7-9ma Gm=1900-2100
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