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

[km1h]

One thing about many hams is that they are incapable of adapting to the 
march of technology!
Any time an amp comes in here for service and the owner has added obsolete 
and/or junk science across the diodes I rip them out.

However back in the 60-70's the caps and resistors were certainly needed.

This is analagous to someone who still insists in using 30W Non detergent 
oil in his antique car simply because it is specified in the owners manual!

Carl
KM1H
National Radio 1963-69


----- 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 6:05 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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