Antique radios, Old Time Radios
RK-721A
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Country:
United States of America (USA)
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| Identical to |
RK-721A
= 721A
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| Base |
Top contact with a cap.
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| Was used by |
Radar |
| Filament |
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| Description |
Disc-seal TR/ATR tube, with keep-alive electrode connected to a cap. External cavity at 2.7 to 3.3GHz frequency. Developed to protect solid state diode mixers against RF pulses generated by the magnetron transmitter, this TR switch incorporetes an igniter, the keep-alive electrode, that gives a bias ionization and improves spike protection of the receiver. The copper discs are shaped and supported by a special glass ring, to obtain a low temperature coefficient and a resonance drift with temperature as close as possible to that of the magnetron. The tubes were pretuned before exhaust, placing them in a special cavity and deforming the copper discs with a tool.
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