Antique radios, Old Time Radios
721A
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| Identical to |
721A
= CV3595
= RK-721A
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| Similar
Tubes |
Other characteristic (electr. data):
721B
; REL64
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| First year |
01.Apr.1942
- - Manufacturers Literature
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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.
Manufactured by WE, Sylvania and Bomac.
Text in other
languages (may
differ)
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| Tube prices |
2 Tube prices (visible for members
only)
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| Information source |
Tube Lore (I)
- - Manufacturers Literature BSTJ, The Gas Discharge T/R Switch
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721A: Manufacturer's Literature
Emilio Ciardiello
More ...
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721A: RR
Reinhard Riek
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
Collection of
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