(!) 5687 Raytheon part bronze part black plates used/tests like new 1960 (33/38ma)
$ 29.99
1 low noise tube) 5687 Raytheon part bronze part black plates used/tests like new 1960 era in white box - faded printing
33ma Gm=11,000
38ma Gm=11,800
Good Ma range 30-35ma
Recommended for
Manley
Modwright
Audio Note
Ray Samuels
Ayon
Kondo
Mastersound
Audio Thrills
Loth
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 5687 Raytheon part bronze part black plates used/tests like new 1960 (33/38ma) "Pin It")