Ok Carl...
The kit is Heathkit part number 830-94. I is simply to increase the capacity
of the power switch with a relay.
This guy is so miss informed (like me so YOU say) that he installed the
power switch mod AND a Harbaugh step start mod in the same amplifier! Please
see the picture!! BTW, the resistors near the relay are for dropping the
coil voltage when the amp is used on 240 volts. Oh, and Heathkit used the
exact relay for switching the AC in the Heathkit SB-1000.
http://www.pestingers.net/HL2200.htm
Please see Heathkit Mod # HL-2200-4
http://www.tech-systems-labs.com/service/hl2200.txt
I just shake my head Carl...
73
Jim W7RY
--------------------------------------------------
From: "Carl" <km1h@jeremy.mv.com>
Sent: Wednesday, April 13, 2011 6:25 PM
To: "Jim W7RY" <w7ry@inbox.com>; <Gudguyham@aol.com>; <Amps@contesting.com>
Subject: Re: [Amps] Which hearhkit amp would you choose?
> 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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>
>
>
>
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