Negative is wrong Jim.
Its called a step start and serves the function it was designed for. There
is no other reason to use a step start in a SB-220 as the transformers are
current limited, the switch is the weak link and pretty unobtanium. When
switching to more C in the PS then it will also help there.
Carl
KM1H
----- Original Message -----
From: "Jim W7RY" <w7ry@inbox.com>
To: "Carl" <km1h@jeremy.mv.com>; <Gudguyham@aol.com>; <Amps@contesting.com>
Sent: Wednesday, April 13, 2011 8:30 PM
Subject: Re: [Amps] Which hearhkit amp would you choose?
> Negative Carl.
>
> The upgrade was to simply save the power switch. It installed a relay to
> switch the high current AC carried by the front panel switch.
>
> 73
> Jim W7RY
>
>
> --------------------------------------------------
> From: "Carl" <km1h@jeremy.mv.com>
> Sent: Wednesday, April 13, 2011 6:05 AM
> To: <Gudguyham@aol.com>; <Amps@contesting.com>
> Subject: Re: [Amps] Which hearhkit amp would you choose?
>
>> 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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>>
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