Antique radios, Old Time Radios
426XQ
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| Tube type: |
Screen-grid Tetrode |
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Ca. 1925 up to 1945 no serial production. For
instance only development samples. ***** |
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| Identical to |
426XQ
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| First Source
(s) |
Oct.1947 : Bell System Technical journal october 1947
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| Predecessor Tubes |
701A
5D21
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| Base |
Top contact with a cap.
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| Was used by |
Radar |
| Filament |
Vf 8 Volts / If 7.5 Ampere / Half indirect |
| Description |
High-power pulse amplifier tetrode for radar modulators: 25 kV, 2 MW peak power.
The design used the large bulb of the 701A and inside the four in-line cathodes of the 5D21. Cathodes were more spaced and two separate control and screen grid pairs encompassed each a couple of cathodes. This structure granted higher voltage handling capability and better grid dissipation.
No production reported.
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Dimensions (WHD)
incl. pins / tip |
64 x 150 x mm / 2.52 x 5.91 x inch |
| Information source |
-- Original-techn. papers.
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426XQ: Bell System Technical journal october 1947
Patrice Zeissloff
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