[Heathkit] SB-200 Problem

[Fern Rivard]

There is absolutely nothing wrong with Richard Measures mods.  It's pretty 
well an absolute must to incorporate those mods in most of the amplifiers 
although there are a few of them that do not require them (Richard will tell 
you which ones). Also incorporating "soft start" circuits in those old 
fragile hf amps is an excellent idea for all of the minimal costs involved. 
The more modern up to date amps such as the alpha's use hypersil core 
transformers and have the necessary protection circuitry built-in.
    Just my 2 cents worth.     Fern    VE7GZ




----- Original Message ----- 
From: <jbrannig at optonline.net>
To: "km1h" <km1h at jeremy.mv.com>
Cc: "Donald Rowland" <HASDRUBAL at peoplepc.com>; <heathkit at mailman.qth.net>
Sent: Tuesday, May 24, 2005 8:48 AM
Subject: Re: [Heathkit] SB-200 Problem


> This is the second time this week that I posted a simple, straight forward 
> message and got a snotty response from some self proclaimed "water 
> walker".
>
> I'm done.........
>
>
>
>
> ----- Original Message -----
> From: km1h <km1h at jeremy.mv.com>
> Date: Tuesday, May 24, 2005 9:58 am
> Subject: Re: [Heathkit] SB-200 Problem
>
>>
>> >> Id start by removing the Measures mods as they are voodo science.
>> >> Its not
>> >> easy to find 33-47 Ohm 2W carbons these days but Id rewind
>> >> original spec
>> >> parasitics.
>>
>>
>> > I've had Measures parasitic suppressors in my SB-220 for years.
>> > There is no switch arching, spitting or strange noises.
>> > Voodoo, yes, effective, absolutely......
>> > Jim
>>
>>
>> You would have the same results by doing some basic PM and
>> replacing the
>> parasitic resistors every 10 years or so. Ive had several 200's
>> (of the
>> roughly 300 Ive done) in here for 6M conversions that had the
>> resistors in
>> the low KOhm range and still no arcing switch.
>>
>> The grid circuit voodoo does nothing but decrease stage gain so
>> you need
>> more drive for the same output. As long as grid current is kept
>> within the
>> safe range there is no damage to the tubes; any extra power is
>> simply added
>> to the output.
>>
>> It often amazes me that so many havent a clue to how a GG amp
>> works. And
>> then spend money on junk from someone else with the same lack of
>> understanding.
>>
>> Carl
>> KM1H
>>
>>
>>
>>
>>
>
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