Step Start; early production offered an upgrade kit
Metering component changes
Relative power pot was a failure point, not needed
Improved grid cap values...carried over from SB-221
Extra safety margin in HV bypass after RFC-2
Carl
KM1H
----- Original Message -----
From: <Gudguyham@aol.com>
To: <km1h@jeremy.mv.com>; <mike.lyon@gmail.com>; <Amps@contesting.com>
Sent: Wednesday, April 13, 2011 8:52 AM
Subject: Re: [Amps] Which hearhkit amp would you choose?
> What improvements over an SB-221? Did away with the sensitivity control
> (cheaper). No lighted meters (cheaper) . Circuit improvements over an
> SB-221? What. if you don't like green, I guess it is MUCH more
> attractive.
>
>
> In a message dated 4/13/2011 8:42:32 A.M. Eastern Daylight Time,
> km1h@jeremy.mv.com writes:
>
> HL-2200 if you can find one. It is a reboxed SB-221 for the most part but
> includes enough circuit improvements to make it attractive.
>
>
>
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