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Old 02-18-2011, 11:36 PM
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bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,821
Thanks for the info. The anodized green set is really cool

Here's the original schematic and my proposed modifications to replace the seleniums and eliminate that 20W filament dropping resistor.




I figure I can replace the 10 ohm fusistor with a plain fuse and 100-200 ohms to drop the voltage down when the seleniums are replaced with silicon.
Seems easier than using two separate resistors - one for each diode.

My hope is that the CL-90 will provide a soft start but not restrict the current too much. I have a CL80 and CL-130 I can experiment with too.
Perhaps I should use a diode that can handle more current ? The surge might be too much for a 1A 1N4007.
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