[Heathkit] SB 303 problem

[Greg Mijal]

Nice receiver eh?
When you're done with the work you will like it. The sensitivity is very 
good. End to end the 500 khz dial should be not more than 2 khz off. The LMO 
was factory made. Don't mess with it unless you have a serious situation
I had one of the large caps in the audio board go out on mine so I replaced 
them all.  The power resistors should be checked also while your there.
Here's some stuff about the SB 303 that's pretty common:
You may have to rock the bandswitch to get it work correctly.  It's caused 
by the way it was designed.  Vertical boards with wafers soldered to them 
and a long shaft thru it.
I think you could make it better but I doubt if it can be completely 
elminated.
The S meter will read high but you can resistor change your way into more 
accurate defelction.
An extender board will help alot with troubleshooting but those boards are 
kinda rare.
If you have a warped frequency dial or the other plastic stuff you can shim 
the front panel away from the chassis and still use the warped read-out 
stuff.
Overall, it is a very good receiver with outstanding sensitivity.  The more 
filters the better and I have seen many with all installed. I say the 303 is 
well worth the effort and if you work weak cw sigs, it's a killer it's 1/2 
of  the Benton Harbor S line.
Hi Collins guys!!
73's
Greg
WA7LYO
in sunny Feenix

----- Original Message ----- 
From: "A.W. B." <a7bull at hotmail.com>
To: <heathkit at mailman.qth.net>
Sent: Saturday, November 04, 2006 6:55 AM
Subject: [Heathkit] SB 303 problem


>I just bought a non working SB 303 and am in the initial phase of trouble 
>shooting. it seems to be in fair shape and both the optional filters are 
>included. When turned on all I get is a loud hum. I removed the power 
>supply board and the two 500 mfd caps look pretty bad and show leaky on my 
>old Heath cap checker. Before I order new caps I was wondering if there is 
>anything else that might be suspect and would these bad caps account for my 
>whole problem? Any suggestions are welcome. Thanks!
>
>                       Andy W1AWB
>
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