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137-A

 
See also:
The Anode Bend Detector
    
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This exhibit is a point of sale display featuring the 137A. Arcturus were known for their use of blue glass envelopes. Their slogan 'The Tube with the Life-Like Tone' is on the wooden tray.
This exhibit came from the Federal Radio Shop, Cortland Avenue, New York City.
The 137A from Arcturus is a low impedance low gain amplifier triode. One of its original intended applications was as an 'anode bend' signal detector. The 'anode bend' detector gives a reasonable audio gain with appreciably less audio distortion than the better-known 'grid-leak' triode detector. Use of the Type 137A as a detector became obsolete when the superhet with AVC and the double-diode-triode became the norm.
The cylindrical anode is held on one side only. The control grid also has a single sided support.
Thanks to Joe Gruber for sending the images.
The envelope is  mm in diameter and, excluding the UX5 base pins, is  mm tall.
Reference: Joe Gruber.

 

Pin Connections
UX5
1
2
3
4
5
h
a
g1
k
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-18
7.5
8,400
1.1
Updated February 12, 2021.
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