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Re: [Amps] SB220 tune cap

To: amps@contesting.com
Subject: Re: [Amps] SB220 tune cap
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Sat, 19 Apr 2014 05:35:50 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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@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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