1 low noise tube) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 low hours/like new fairly good printing

2.2ma Gm=1450

2.0ma Gm=1400

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