[Hallicrafters] SX-28 help please

[Robert Nickels]

On 5/5/2010 1:32 AM, hallicraftersx28 at aol.com wrote:
> 90 V over 5 days !! Were  you  slowly trying to ROAST the rcvr ?
>    
I hate to pile on, but just to amplify what Carl, Nick, and others have 
said, everyone should just forget about this "bring it up slowly on a 
variac" myth.  It is almost surely not going to properly reform the 
electrolytics and is likely to have unintended consequences.   That's 
the problem with the internet - beginners have trouble separating the 
urban legends from sound technical facts and procedures.

A variac is a useful tool when used as Carl described.  (I like to add a 
light bulb in series just for added protection), and with care, proper 
measurements, and solid-state rectifiers - can be used for in-situ 
reforming.    But the only way to properly restore a piece of vintage 
electronics is to understand first how it works, and then go through a 
systematic troubleshooting and restoration process like has been 
described.   Not only will you end up with a properly-functioning piece 
of gear but you'll understand how it works!

73, Bob W9RAN