[Amps] SB220 tune cap

[Jim W7RY]

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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