[Amps] SB220 tune cap

[Pete Smith N4ZR]

IIRC, from this reflector years ago, all the change did was to move the 
location of arcing to the bandswitch

73, Pete N4ZR
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On 4/18/2014 8:10 PM, Jim W7RY wrote:
> The later version was longer (more plates) and wider plate spacing. 
> This was an attempt to fix the arcing issues on the SB220.
> Which is usually caused by ALC overshoot in the radio or RF being sent 
> by the exciter before the antenna relay was energized.
>
> There were 2 holes on the chassis. One for the short capacitor, and 
> one for the long capacitor. The stud that is between the 10 meter coil 
> and the bracket on the end of the tuning cap is also shorter (or 
> removed) when the longer cap is used.
>
> No other changes needed with either cap.
>
> 73
> Jim W7RY
>
>
> -----Original Message----- From: Paul Kraemer
> Sent: Friday, April 18, 2014 12:54 PM
> To: amps at contesting.com
> Subject: [Amps] SB220 tune cap
>
> Can someone please enlighten me on two different PA tune capacitors 
> used in
> the SB-220?
> I have a 220 I am starting to rebuild and seeing initially that 
> someone had
> "messed" with the PA tune cap I picked up a very clean replacement on 
> ebay.
> It was also mentioned that it was the "later" version PA tune cap.
> The two look similar except the "newer" one appears better quality and 
> has
> more plates.
> Any other differences in the tank circuit to go along with that?
> Thanks
> Paul K0UYA
>
>
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