3 microphonic single tubes) JAN-5687WB Tungsol branded Raytheon black plates “”U”” getter NOS 1950”s in white boxes
Tested on Amplitrex
Vplate=120V
Vgrid=-2V
Good Ma range 30-35ma
Good Gm range = 10K-12K
Recommended for
Manley
Modwright
Audio Note
Ray Samuels
Ayon
Kondo
Mastersound
Audio Thrills
Loth


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