Antique radios, Old Time Radios
XL7900
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Country:
Netherlands
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| Identical to |
XL7900
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| Base |
Magnoval (9-Pins), B9D
Top contact with a cap.
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| Was used by |
Technology / Measurement |
| Filament |
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| Description |
This is a very special vacuum-sealed vibrating capacitor, intended to operate as modulator for very feeble DC signals, replacing electro-mechanic vibrating choppers. Amplifiers capable of measuring currents as low as 500 electrons per second have been realised using this device.
- Insulation resistance greater than 1000 teraohms
- Capacitance of Cdr and Cm 35 pF
- Resonating frequency between 5.3 and 6.3 kHz.
Magnoval base, gold-plated pins
* Cdr = Driving capacitor
* Cm = Measuring capacitor
Philips Holland design.
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| Information source |
-- Original-techn. papers.
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XL7900: Manufacturer's Literature
Emilio Ciardiello
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Just Qvigstad
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XL7900: PHILIPS
Ulf Krahnepuhl
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