[AMPS] Re: resistance

[George T. Daughters]

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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