(!!!!) (Recommended Pair) 7199 RCA black plates NOS 1960's (12/6.6ma and 13.2/7.0ma)

1 pair) 7199 RCA black plates NOS 1960's

1 tube)

12ma Gm=6500 (pentode section) good

6.6ma Gm=1750 (triode section) good

1 tube)

13.2ma Gm=7100 (pentode section) good

7.0ma Gm=1800 (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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