[AMPS] Re: resistance

[k4auw@juno.com]

Hello all,

Wonder if anyone has ever acurately measured a reistor for a parasetic
supressor before assembly, soldered it to the PS inductor, then
un-soldered and re-measured the value?  I would be interested in the
value change for various resistor compositions from the heat of the
solder de-solder process if proper heat sinking was done.

73....Ron

On Tue, 25 Nov 1997 08:33:28 +0008 "George T. Daughters"
<gdaught6@pobox2.stanford.edu> writes:
>
>hi all,
>
>rich wrote...
>
>> If your amplifier arced mysteriously, it might be interesting to 
>measure 
>> the resistance of the VHF parasitic suppressor resistor.  
>
>it is perhaps important to note that an increase in the resistance of 
>a composition resistor (or a film resistor, too) can increase when 
>the resistor gets too hot.  (rich has said this, too.)  it doesn't 
>have to be so hot that it bakes the color bands to new colors.  the 
>point i want to convey is that it doesn't *have* to be a parasitic 
>oscillation that causes this change.  i've seen resistors in dc power 
>supplies increase by a factor of 3 or 4 by chronic overheating, but no 
>
>smoke was emitted.
>
>73,
>George T. Daughters, K6GT
>
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