[Heathkit:Yahoo] SB 102 et al

[Bob Burns]

In a message dated 12/08/2010 15:57:23 GMT Standard Time, elespe at lisco.com  
writes:

I am in  process of repairing a SB-102 in which one of the oscillator coils 
has a  broken slug
By the time I extract the broken chips of ferrite from that  tiny coil I 
fear 
there won't be any coil left
It may be as easy to just  replace the board
It is the one directly behind the board with the  hetrodyde osc crystals
I imagine it is same board for SB-100, 101, and 300,  400 etc
If you have one available please let me know
Thanks
Paul  K0UYA 


-------------------------------------------------
Hi Paul
 
I have seen several of these for sale on eBay over the last month or so. Do 
 a search for Heathkit SB or Heathkit HW.
 
You can pick the broken core out if you have a sharp scriber and a lot of  
patience. Dust iron cores are much easier to remove as the material is 
softer  than ferrite and they can be drilled out, ferrite cannot.
 
I lubricate the cores with some silicon grease and also make sure that the  
trimming tool is a snug fit. If it is a loose fit due to plastic shrinkage 
over  the ages then the cores will break much more easily.

 
73

Bob

Bob F Burns
C Eng,  FIET, MSE
Amateur Radio Callsign: G3OOU
G-QRP Member No: 6907; Zone: 14,  QRA: IO91WH; WAB: TQ25
Joint web site with Crystal Palace Radio &  Electronics Club: 
_www.g3oou.co.uk_ (http://www.g3oou.co.uk/) 
Technical web site: _www.qsl.net/g3oou _ (http://www.qsl.net/g3oou) 

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