Antique radios, Old Time Radios
TT-15
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Country:
United States of America (USA)
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| Identical to |
TT-15
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| Base |
Miniatur-7-Pin-Base B7G, USA 1940
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| Filament |
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| Description |
Chronotron tube. The tube contains two heaters and two electrically isolated thermistor elements. Connected in the circuit of a low frequency oscillator, it controls the period by thermal feedback. TT-15 has 1000 ohms heaters and 500 ohms temperature sensing resistors, 130 sec time constant.
Also used in bridge circuits for measuring RMS value of an arbitrary waveform, compared with a known DC current flowing in the opposite branch.
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| Information source |
- - Manufacturers Literature
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TT-15: Manufacturer's Literature
Emilio Ciardiello
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TT-15: Private collection
Emilio Ciardiello
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TT-15: Manufacturer's Literature
Emilio Ciardiello
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TT-15: Manufacturer's Literature
Emilio Ciardiello
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from Just Qvigstad
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