(microphonic tube) JRP-5687 Raytheon NOS black plates D getter NOS 1957 (31/31ma)

1 microphonic tube) JRP-5687 Raytheon NOS black plates D getter NOS 1957 in white box, reddish-orange printing, from factory bulk pack of 100

1 section) 31ma Gm=9800

1 section) 31ma Gm=10,000

good as driver tube or output buffer tube