[Heathkit] SB-200 Problem

[km1h]

Thank you Woody. It appears that a few here dont understand that I was only 
trying to offer sound advice.

As far as the "engineering study" is concerned this was covered in depth on 
the Amps Reflector several years ago and included engineers from Alpha and 
Ameritron. My professional amplifier backround goes back to National Radio 
where I was on the NCL2000 development team. I was also a consultant to Amp 
Supply and B&W when they had some reliability and instability problems. I 
personally have been building amps since the 1950's and currently have an 
amp repair and upgrade business.

Bottom line is that if Measures voodo was soo good why hasnt it been adapted 
in industry? In truth, even Eimac engineers have spoken out against it.

Step start is a good idea in some amps, however not necessary in the Heath 
SB series. Those transformers were designed to limit inrush current, 
especially the SB-220 filament xfmr.

Keeping filament voltage within spec is mandatory for long tube life. 
However be sure you are using a true RMS meter and not a peak reading 
version as is common in cheap multimeters.

Nuff said. If the whiners cant be bothered to learn something its no skin 
off my back.

Carl
KM1H

----- Original Message ----- 
From: "Woody" <kj4so at ipass.net>
To: <heathkit at mailman.qth.net>
Sent: Tuesday, May 24, 2005 5:43 PM
Subject: Re: [Heathkit] SB-200 Problem


> Someone cried:
> "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........."
>
> And then, someone else whined:  "Yes, it's unfortunate someone chose to 
> grind their axe at your expense".
>
> No!  What is really unfortunate is when someone does not recognize very 
> good advice from someone who knows what they are talking about, and was 
> just trying to help.
>
> Woody
> KJ4SO
>
> ----- Original Message ----- 
> From: "john" <johnmb at nc.rr.com>
> To: <jbrannig at optonline.net>; "km1h" <km1h at jeremy.mv.com>
> Cc: "Donald Rowland" <HASDRUBAL at peoplepc.com>; <heathkit at mailman.qth.net>
> Sent: Tuesday, May 24, 2005 5:00 PM
> Subject: Re: [Heathkit] SB-200 Problem
>
>
>> Yes, it's unfortunate someone chose to grind their axe at your expense.
>>
>> John K5MO
>>
>>
>>
>>
>>
>> At 10:48 AM 5/24/2005, jbrannig at optonline.net wrote:
>>>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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>>
>>
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> _______________________________________________
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