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Categories | Amplifiers: RF Power - HF & HF+6M | Heathkit SB-220/SB-221 Help

Show all reviews of the Heathkit SB-220/SB-221

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KA4KOE  Rating: 5/5 May 5, 2014 10:01  Send this review to a friend!
Old warhorse  Time owned: 0 to 3 months
Received a very nice SB220 in a trade. I installed the Harbach metering/rectifier and soft key boards. The amplifier has the original Eimac 3-500Z tubes. With 100W drive, the amp will just make 1200W. However, you should remember that the amp is not duty cycle rated for full power keydown. I typically run mine around 175W carrier when working AM. I drive my SB220 with a Flex 5K. The amp is extremely easy to tune, but gets a little dicey up on 10m, where thee power out-poot drops to about 800W.  
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