Paul
 
I would recommend the Sherwood psu mod.  It'll get rid of most of your other dubious electrolytics in one fell swoop and will also significantly reduce heat disipation around the pto area  This will lead to a significant improvement in frequency stability.  It's a straight forward installation too.
 
73 
 
Bob, 5B4AGN
----- Original Message -----
From: AD3G
Sent: Sunday, August 14, 2005 4:18 AM
Subject: [drakelist] R4C hum

Hello list...I recently acquired a nice R4C,but it has some issues...I powered up slowly on a variac,but the filter caps were hopelessly shot. I replaced with a Sherwood filter cap kit.I have far less hum,but it's still there,just not as bad(I can hear reciever hiss now). Would a power supply mod be in order,(Sherwood)or should I just change out the caps on the p/s board? I'm new to Drake gear and wanted to see what the general consensus of the Drake gang would be.
 I plan on keeping the R4C for a while,so I want to do it right the first time. 
 
           73  Paul

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