[Heathkit] [Heathkit:Yahoo] SB 102 et al

[Bob Macklin]

You can sometimes loosen the cores with heat from a hair dryer.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: <G3OOU at aol.com>
To: <heathkit at yahoogroups.com>; <heathkit at mailman.qth.net>; 
<heath at lists.tempe.gov>
Sent: Thursday, August 12, 2010 12:09 PM
Subject: Re: [Heathkit] [Heathkit:Yahoo] SB 102 et al


>
>
> 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/)
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