[Drake] L4b/L7 power supply rebuild??

[Garey Barrell]

Dave -

The L-4B supply gets fairly warm in operation, even in standby, but 
shouldn't "smell hot".  There are a couple of big bleeder resistors that 
could have accumulated dust that's burning off, but if it still has the 
original capacitors in it they are way past their expected life...

You probably saw the rebuild kit offered by Mike at The Heathkit Shop.  
It's a whole new PC board with all new caps and resistors in a more 
reliable physical form than the original, similar to his AC-4 rebuild kit.

<http://www.theheathkitshop.com/page5/page5.html>

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>



Dave Edwards wrote:
> Can someone help me out?
> Unless I'm confusing this for the transceiver power supply rebuilds, 
> didn't I see a filter board or caps or something like that to rebuild 
> the L4 and L7 series Drake supplies?
>  
> Turned on my L4B today and the supply sure smelled like something 
> frying....and got fairly hot without even transmitting. Nothing 
> popped, but I shut it down. Could have just been dust or bugs?? since 
> it sits close to (but not on) the ground in a basement shack. Has not 
> been on for about a year and a half!!
>  
> I figure even if all is well, how old must those caps and high voltage 
> parts be???   Probably could use a "once over"
>  
> Thanks for anyone's input!!
>  
> ....Dave
>