Handy 1 kW HF Dummy Load

Years ago, after replacing the tubes of a Heathkit SB-200 Linear Amplifier, I was on the lookout for a dummy load to test it.

It then struck me that a 230V ~ 1kW electric hot plate, with its heating element resistance close to 50Ω, would do.


The mains plug of the hot plate was replaced with a PL-259 before connecting it to the output of the linear amplifier.

The amplifier was successfully tested, with its Pi tank circuit providing a proper match to the dummy load.

At a later date, the same exercise was repeated with a Dentron GLA-1000.
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