[R-390] Resistor Tolerances

Mon, 29 Jul 2002 13:19:09 -0400

> How sensitive the circuit is to the resistor value depends on where the
> resistor is in the circuit.
> The resistor values  used in B+ decoupling (2.2k), grid input, grid
> parasitic suppression, or audio plate are not critical at all.
>
> The values used in the voltage dividers for the screens are a little more
> important , and the cathode resistors probably make the most impact as
they
> set the bias level for the tubes.
> (Don't forget that tubes have fairly wide tolerances too and drift over
> operating age as well).
>

Thank You John.  That is the answer I wanted.
I'll watch out for the screen dividers and the cathode
resistors especially, and keep them within the recomennded
tolerence.  The other resistors, I won't worry if they go
a few percent over.

Thanks.
Scott

> 73,
> John
> .
> ----- Original Message -----
> From: scott <[email protected]>
> To: <[email protected]>
> Sent: Monday, July 29, 2002 7:45 AM
> Subject: Re: [R-390] Resistor Tolerances
>
>
> > Well I never buy NOS resistors and certainly not caps.  Baking resistors
> > before measuring
> > tolerance is just not the real world, even though most boat anchors do
> just
> > that.  :-)
> > The real question I have is: If the tolerance needs to be held to
original
> > specs on any specific
> > areas of this set.  I am trying to rely on someone's experience to save
me
> a
> > lot of
> > needless work now or in the future.........
>
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