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Author Topic: Swan 350 800ma Cathode Current? HELP  (Read 1829 times)
K8KAS
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Posts: 570




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« Reply #15 on: April 09, 2007, 05:15:23 PM »

I have owned a number of Swan 350 and 500 rig. First never use the tune position if you want the finals to last long. You unbalance the carrier null (in SSB) pot to get 20 or 30 watts output to peak the final tune. You should mark the loading control position or log it per band. A good set of finals should produce about 350 watts output when new. This settles down to about 250 to 275 watts output after a few weeks. You could almost count the length of tube life by the number of times you tuned up at full power, it was not as bad in the 60's and 70's when you could buy the finals cheap.
The shunt resistor value is off and that accounts for your high plate current. I think 500 ma was about all you could get out of the power supply. Long time ago. 73
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