Antique radios, Old Time Radios
D250
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| Tube type: |
ANY OTHER - NOT A TUBE, general Text |
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| Identical to |
D250
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| Similar
Tubes |
Different maximum ratings:
D100-600
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| Base |
UX-Base (4 Pins (2 thick, USA 1924, UX)
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| Description |
Dummy antenna resistor. 250W non-inductive. Ohmite mfg. Co., Chicago.
The D100 (100W) and D250 (250W) RF resistors were available in 13 resistance values, from 13 to 600 ohms. Distributed capacitance was around 5pF, while residual inductance was between 0.1 and 1 microhenries, depending upon resistance value. Max operating frequency ranges from 40MHz for the 13 ohms type to 5MHz for the 600 ohms.
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| Information source |
-- Original-techn. papers. Blackburn, MIT Components Handbook
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