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Re: [Amps] SB-220 Plate Tuning Capacitor

Subject: Re: [Amps] SB-220 Plate Tuning Capacitor
From: R L Measures <>
Date: Wed, 7 Jun 2006 02:31:40 -0700
List-post: <>
On Jun 6, 2006, at 9:03 AM, Peter Chadwick wrote:

>> From what Colin told me in a private email, it seems to me that  
>> the SB220 bandswitch is right on edge for the kW input power  
>> level, and too small at 1500 watts for safety.

The measured breakdown potential of a SB-220 bandswitch is c. 4900v  
at sea-level.  At 390v peak output into 50-ohms, the actual potential  
across open bandswitch contacts is c. 2600v-pk.

R L MEASURES, AG6K. 805-386-3734

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