Antique radios, Old Time Radios
1681
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Country:
United States of America (USA)
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| Identical to |
1681
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| Similar
Tubes |
Other class quality (otherwise equal):
6AQ5
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| First Source
(s) |
1950 : Tube Lore (I)
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| Production stop |
1952 |
| Was used by |
Technology / Measurement |
| Filament |
Vf 6.3 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC |
| Description |
Beam power amp., modified 6AQ5. Had special control grid and tungsten heater wire in place of "Dowmo". Tested for zero-bias plate current, cutoff, shorts, and life. Sold only to IBM. Intro. 1950; withdrawn 1952. (IBM reportedly got better quality w/ GE and TS tubes.) Tubes were to be etched "6AQ5," and branded w/ "IBM" and probably w/ IBM part no. 300706. [Information by L. Sibley]
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1681: ARRL Handbook 1972
Anonymous 10 Collector
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