[Heathkit] SB-200

[jeremy-ca]

----- Original Message ----- 
From: "Peter Markavage" <manualman at juno.com>
To: <heathkit at mailman.qth.net>
Sent: Monday, April 30, 2007 12:59 PM
Subject: Re: [Heathkit] SB-200


> QST, Jan. 1969, page 44 has a mod for converting SB-200 to 6 meters.

Try it, it doesnt work; I get several in here to undo the mess and do it 
correctly. Often times the tubes have been destroyed from oscillation. Ive 
yet to see a decent "conversion" article in any ham rag.


> Power Supply upgrade, soft-key mod, in-rush current upgrade approx cost
> is between $100-150 from Harbach Electronics.


PS: If it aint broke dont fix it. Besides when the time comes you can get 
the parts from Mouser a lot cheaper.

In Rush: Totally unecessary and just adds another potential failure point.

Soft Key:  Only if the TX/XCVR driving it cant switch -125VDC


Condition of tubes should
> also be a consideration. SB-200 is a great HF linear. It's a shame to
> convert it to 6 meters. Might be cheaper and easier just to go and buy a
> 6 meter amp.

Ive converted over 300 SB200's to 6M over the past almost 40 years. With 
over 10,000 built its not exactly a collector item. Try and find a 700W 6M 
amp for that kind of money.

Carl
KM1H


>
> Pete, wa2cwa
> Dayton Spaces 1960-1961
>
>
>
> On Mon, 30 Apr 2007 09:46:32 -0500 Earl <n5zm at arrl.net> writes:
>> I am new to the list. I have a chance at a 'Really Nice' SB-200.
>> (According to
>> the seller I have not seen it). Not sure how long it has been out of
>> service.
>>
>> My question is, about what is it going to cost me to bring it up to
>> date with
>> power supply mods ect. I would also like to put it on 6 meters.
>>
>> Any comments would be appreciated, especially about the 6 meter
>> mod.
>>
>> My soldering/construction skills I guess would be above average but
>> my
>> technical skills (knowledge of circuitry) would be average at best.
>>
>> TIA, 73
>>
>> Earl N5ZM..
>>
>>
>>
>>
>> -- 
>> Earl F. Smith - N5ZM
>>
>> PO Box 20065
>> White Hall, AR  71612-0065
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