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Re: [Amps] Amps Digest, Vol 212, Issue 1

To: AMPS submit <>
Subject: Re: [Amps] Amps Digest, Vol 212, Issue 1
From: RCM <>
Date: Sat, 1 Aug 2020 14:35:28 -0400
List-post: <>

> On Aug 1, 2020, at 12:40, wrote:
> Hi Mike!
> Yes - in my experience that is about what you can expect from a used 
> SB220/221. 

Those amps, it’s power supply and tank circuit were designed when the rule was 
1 KW input, and get 600 out.

With the 2400 or so volts on the plate and not the 3500 of a Henry or 
Ameritron, all you are doing is smoking the grids

and causing splatter over half the band.

My home-brew, with grids  grounded, 3600 v, does 1500 out with 70 w of drive, 
and 150 mils of grid current.
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