[Amps] L4B Caution

[Jim Smith]

What is glass tape and what is it used for?

Jim Smith  VE7FO

On 2013-07-25 10:32, Ed K0KL wrote:
> I had a bad experience when working on an L4B for a pal. The bleeder
> resistor mounting
> scheme proved to be a little poor (unusual for Drake). When reinstalled,
> one of the resistors
> shorted to the mounting screw.
> This bleeder is held in place by a screw that goes through the center of
> the resistor. Mica slices
> insulate the ends (chassis and screw head). Only thing is the resistor
> arced through the ceramic
> base material. So I used glass tape to insulated the screw on the
> reinstalled components. This
> provided better spacing to the center of the screw.
> Note- I replaced the resistors, having the same thing reoccur. Only with
> the use of the tape did
> the thing calm down. Ordinary electrical tape won't work as it will melt
> caused by the heat of
> the resistors.
>
> Anyway, that was some time ago, the amp is going strong. Except for a
> rather weak plate
> transformer, this puppy will no doubt last several lifetimes.
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