(!!!!) (2nd Best Pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new faded printing (2.6/2.7ma and 2.7/2.8ma) 1-3% matched (Same Gm)

1 low noise pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new faded printing in white boxes 1 tube) 2.6/2.6ma Gm=1700/1700 1 tube) 2.7/2.8ma Gm=1700/1700   Matched on Amplitrex  Vplate=250V Vgrid=-4V Good used mA range = 2 - 2.5ma Good used Gm range = 1300-1500   - sE Electronics Z5600a II Tube Microphone- Fender Bassman 1953- Korby Kat- Telefunken 251- Silvaweld SWC 450 preamp- Peluso P12 mic- Kondo M-1000 and Kondo KSL-M77 - Kondo Kassai Silver amp - Kondo KSL-Kegon Power Amplifier- Avantone cv12- Rode mic (Classic I)- Audio Note L3 phono- Ongaku- AKG C12 1950's- AKG C12 VR- Soundelux U95- Soundelux E251C- Soundelux ELUX 251 (recreates the sonic beauty of the Telefunken ELAM 251)- Electronaut M63 mic preamp 2010- Pearlman Microphones TM 250 (like E LAM 250)- Lawson mic- Chunger C12 clone