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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 12th Jan 2020, 4:03 pm   #1
nigelpritchard
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Default Welwyn RF Dummy Load Resistor

Related to my other recent posts of a similar topic, does anyone have a spec for the Welwyn Carbon Rod resistors C743 of 1960's vintage. It's a 52 Ohm 2% part but I'd like to know its power rating.
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Old 12th Jan 2020, 4:38 pm   #2
ronbryan
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Default Re: Welwyn RF Dummy Load Resistor

The C743 has a maximum continuous power of 15 Watts. At 20 degrees C ambient, the maximum surface temperature at nominal load will be not greater than 150 degrees C.

Data from Welwyn Electric Ltd catalogue 1970-71 page 174

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Old 14th Jan 2020, 12:46 pm   #3
nigelpritchard
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Default Re: Welwyn RF Dummy Load Resistor

That's interesting! I imagined from its size that it might be good for about 25-30W but anyway many thanks Ron for your help.

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