[Heathkit] SB-610 Selenium Diodes - caps across silicon diodes.

[Tom NØJMY - AAR7FV]

And, I guess Heath never bothered with it on any HW-16's, so I never did 
either when I've rebuilt them.  Never had any problem, but I always 
wondered if I was doing sub-standard work.

73,
Tom
----- Original Message ----- 
From: "Kim Herron" <kherron at voyager.net>
To: <k4oah at mindspring.com>; <w8krr at arrl.net>; <Heathkit at mailman.qth.net>
Sent: Monday, July 04, 2005 5:05 PM
Subject: Re: [Heathkit] SB-610 Selenium Diodes - caps across silicon 
diodes.


> Hi Gang,
>>But .... what's SAFE about putting a 1 or 2W resistor rated at 500V 
>>across a diode that sees 800-900 PIV?  Or the roughly 8 Watts  _peak_
>>dissipation in those same resistors? The caps don't hurt anything, _AS 
>>LONG AS_  they are rated for at least 1000VDC.
>>Mike,W8KRR wrote:
>>>Still say "better safe than -"
>>>Mike
>
>         Not to create an argument here, but I agree with Garey, and 
> just to add this:  I haven't put resistors and caps
> across diodes for at least 15 years, for just this reason.  Things 
> change, and you are supposed to adapt when they do.
> It goes along with discussion that occurs every 6 months to a year 
> about reforming old electrolytic caps and reusing
> old paper caps.  The current wisdom on the subject says (and that mil 
> paper sited here a while back agrees) PITCH
> the junk, but it's still a discussion.  BTW, in the Heath scopes under 
> discussion, there ain't no room for resistors and caps,
> unless you want to create a voltage flash over condition to the 
> chassis.  The diodes will work just fine without the extra components
> and adding them will create more of a likely problem then leaving them 
> out.
>
>
> Thanks!!
>
> Kim Herron  W8ZV
> 1-616-677-3706
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