John,
In my opinion, the use of Nylon for general standoffs in an RF amplifier
is perfectly fine if a bit of thought is given as to the temperatuer
they will be exposed to. I would not consider Nylon for a tank or plate
coil former nor for the building of capacitors (as a dielectric). I use
a machined Nylon couple between my two roller inductors in my balanced
tuner and have seen no issues there. Supporting your plate coil on
Nylon would not be advised due to both RF fields and high temperature.
Instead of ceramic standoffs consider G-10 glass reinforced epoxy stock.
You can get it from McMaster Carr in a variety of shapes, including
tubes suitable for coil winding.
Tomm, KD7QAE
going down in frequency since 1975...10GHz >>> 1.8MHz
John Irwin wrote:
> I made the original inquiry about the nylon I found at the ace hardware store
> . These little cylinders are the same size,shape as ceramic standoff
> insulators commonly used in amplifiers. I was looking for a low cost
> replacement for ceramic standoff insulators made expensive by the "PARTS
> MERCENARIES" that seem to have infected our hobby today.
> It is likely I will fork over to get ceramic as I don't want to take chances,
> with nylon melting ,softening. or crystallizing. What with big
> bangs,kapow,parasitics, spark gaps and other problems. I will play it safe.
> Nylon goes back to ace. what about glass?
>
> Nylon cylinders cost a quarter. ceramic, well a lot more.
>
> anyone know of a low cost source for ceramic standoff insulators,3/8"
> diameter,length 1/2"
> or something similar.
>
> john kb9tc
>
>
>
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