[Hallicrafters] Rectifier replacement

[Chris Farley via Hallicrafters]

There was a thread on those "Coppercap" rectifiers some time ago in a different group, I'll be darned if I can find it now.  From what I remember, PIV of the diodes they use can't hold up to the HV found in most boatanchor transmitters.  Someone dissected one which had let the smoke out, and confirmed this.  For guitar amps or receivers with B+ of say 500v or less they're fine, but for (example) a HT-32/37 running more like 800-1000v, they're no bueno.  I would build my own in a tube base.  

The higher voltage realized by switching to solid state rectifier is valid, make sure you're not exceeding the voltage rating of filter caps, etc as others have suggested.
Regards, 
Chris

 

     From: Waldo Magnuson <magnuson at mac.com>
 To: hallicrafters at mailman.qth.net 
 Sent: Saturday, November 15, 2014 9:35 AM
 Subject: [Hallicrafters] Rectifier replacement
   
Hi,  I've used several Weber CopperCap SS replacements for 5Z3 (SX-28) and other Hallicrafters boat anchors to reduce the heat and strain on the power transformer.  Recently I had a CopperCap short and blow fuses.  Weber is graciously replacing it but the tech expressed concern over the "high voltages" in the vacuum tube outfits.
  My question is; have any of used anything else, constructed your own, have used Webers, or what?  Thanks.
Skip Magnuson. W7WGM
Spokane, WA


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