SB-634 problems

[Guy Giacopuzzi]

C304 is a 2--18.5pf trimmer capacitor...since it's a pc mount, you might 
find something like it in Mouser's catalog...also, consider looking at 
Surplus Sales of Nebraska...they have an inventory of trimmer's for 
Collins S-line gear, and they will have something that will work.....the 
bigger question is why it blew...I would check all of the diodes and 
caps that are part of that circuit prior to putting any power into it 
again...
    I do have the manual...if you can't find it via the usual places, 
get back with me...I could take a hi res photo of the calibration pages 
and send it to you...

Guy,
WA6OQQ

Dean Naib wrote:
> My SB-634 blew up last night.  I traced the problem to the variable
> capacitor on the RF board.  My copy of the schematics is terrible but I
> think the number is C304.   I  probably have something equivalent in my junk
> box.  I don't have a manual for it so could someone give me the value of the
> part?  Also, once replaced I don't know how to calibrate it.  I see that
> there is a jumper for calibration but I have no idea what to do.  Any help
> would be appreciated!
>
>  
>
> Dean
>
> K4DSN
>
>
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