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Modifica Heathkit SB220
di IV3GFN - Giuseppe (Pino) Steffè
Related sites
Richard L. Measures, AG6K What you have to known about R.F. Power Amplifier
Paul B. Peters, VE7AVV Modifications and other stuff
One day, a friend of mine brought me his power amplifier, an Heathkit sb-220 for a check.
Due to the fact that the preceding owner was an inveterate smoker, the interior were covered
by a tarry patina and so the other components.
When I turned it on a smell of bad tobacco invaded the shack.
This way we decided to effect a deep revision and to clean carefully everything.
Someone modified the radio in wrong way for the 160m. The original parts as the plate
choke had been lost so I rewound another one like the original value of 50 uH.
Adding another choke of 60uH, it will be ready for a future updating for the 160m
coverage as suggested by Rich, AG6K. I followed his instructions to make important improvements that you partly can see below.
Download SB220 manual - (PDF 15.0 MB)
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