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SB-220 All testing is done on a Heathkit Cantenna at 49.6 to 52.4 ohms ( depending on the band). Thanks for so many responses! I have already printed and read (many times) that web page. From there I went to Rich Measures' web site and printed and read what he suggested. I bought his kit for...

I have recently acquired a SB-220. It works perfectly on 80m, 40m and on the higher bands I do not get over 400w and the tubes begin to glow as soon as the key is pressed. tried another pair of tubes - same thing but got a little more power from new tubes. I put the others back in until I figure...

800 watts out of 400 watts worth of transistors? no wonder it quit...

Mic repairs Send them to TSI. There is nothing they dont work on and reasonably priced as well. I read that they have some special elements that they are installing in mics that have excellent sound. TSI 5911 Dr Martin Luther King Blvd Tampa, Fl 33619 813-635-9634 EXT 14

Check the collector circuits of both the driver and the final for leakage to ground.

Squeals... Or,,, you could leave the cover off???

Feedback There are a lot of radios that will feedback when the rfx is installed. Usually, I do several things and it stops somewhere along the way. Hopefully, you have cut all the internal coaxes and wires as short as possible!!! 1. Pay attention to input coax and output coax. They should not...

Hubs There is a guy on fleabay with most Avanti parts