Re: More Amplifone woes ... VECTOR:

The + and - 24 would be right on without the resistors. The resistors are bypass resistors.

What is the ratio of T1?

JB

Mark Shostak wrote:

> > I've been looking at my Star Wars 25" Amplifone HV again.
>
> Interesting, where exactly (dare I ask) are you located?
>
> > I'm getting -31v instead of -24v at the 7924. If I remove the 50ohn 5w
> > resistor the regulator now produces -24v perfectly (though off load).
>
> The resistor is shunting the regulator. Hence with no load, expect to see
> roughly the same voltage on either side of it. If you really want to test it,
> load the regulator output with another resistor.
>
> > I'm getting a 60v? rounded square wave at the collector of the MPSU07
> > AT the base of the BU406D I'm only getting a 4v rounded square wave IS THIS
> > CORRECT?
>
> I've already mailed off the unit I recently fixed, but I seem to recall seeing roughly the same thing.
> Keep in mind the base of that trani is coming off the secondary of a step down xformer,
> so it's going to be significantly lower in voltage (remember the trani is a current device).
>
> Rodger, care to add the minutia?
>
> -Mark
>
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Received on Thu Aug 22 20:24:09 2002