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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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12th Jan 2020, 4:03 pm | #1 |
Diode
Join Date: Jan 2017
Location: Aylesbury, Buckinghamshire, UK.
Posts: 7
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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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Nigel G8AYM |
12th Jan 2020, 4:38 pm | #2 |
Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,958
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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 Ron |
14th Jan 2020, 12:46 pm | #3 |
Diode
Join Date: Jan 2017
Location: Aylesbury, Buckinghamshire, UK.
Posts: 7
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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.
Nigel
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Nigel G8AYM |