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
| 1 | 2 | 3 | 4 | 5 | h | a | g1 | k | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm |
| 6.3 | 0.3 | 250 | -18 | 7.5 | 8,400 | 1.1 |
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Updated February 12, 2021.
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