[Amps] SB220 tune capacitor

[Martin Sole]

Thanks Joe,

I might be looking for the special end plate then, or at least some pictures
to see if I can fabricate one.

73
Martin, HS00ZED


-----Original Message-----
From: Joe Subich, W4TV [mailto:lists at subich.com] 
Sent: 19 October 2010 09:22
To: amps at contesting.com; hs0zed at csloxinfo.com >> Martin Sole
Subject: Re: [Amps] SB220 tune capacitor


 > Did the tune capacitor change during the life of the SB220 or  > perhaps
with similar amplifiers? SB200 HL220 etc.

Yes, later SB220 had a higher voltage breakdown (wider space, more plates)
capacitor that was longer.  It generally came with a special end bracket for
mounting the 10 meter coil.

73,

    ... Joe, W4TV

On 10/18/2010 10:07 PM, Martin Sole wrote:
> Perhaps a question for the Heathkit history buffs.
>
>
>
> Did the tune capacitor change during the life of the SB220 or perhaps 
> with similar amplifiers? SB200 HL220 etc.
>
>
>
> I have received a replacement capacitor, well it's in UK awaiting 
> onward shipment. From a picture of the actual part sent to me it 
> appears to have two differences with the original part, these being 
> that the ceramic insulators are mounted outboard of the aluminium end 
> plates whereas on the original they are inboard and secondly that the 
> number of fixed / moving vanes is 21/22 as opposed to 18/19 on the 
> original part. I am awaiting confirmation of mounting hole spacing 
> which might be the most significant issue, assuming the min C is not now
too high.
>
>
>
> Any thoughts?
>
>
>
>
>
> Thanks
>
> Martin, HS0ZED
>
>
>
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