RCA 7199 Pre-amp Vintage Electronic Vacuum Tube

These rare 7199 tubes are highly sought after because they are no longer manufactured and are used in many vintage guitar amps (Ampeg especially) and hifi audiophile stereo systems. Send an offer within reason if interested! SPECS: The 7199 is a combination triode/pentode used in high-quality, high-fidelity audio equipment applications, particularly in vintage phase-splitters, tone control amplifiers and high gain amplifiers requiring low hum and low noise. It was tested for transconductance (Gm), noise, gas, and shorts on my Dan Nelson calibrated TV-7/U tube tester using a digital meter for greater accuracy. The TV-7/U minimum recommended value (65%) for the pentode section of the 7199 is 50 (Gm=2550). The minimum for the triode section is 42 (Gm=2100).