I don't know, Rich. Tom, told me on this very forum that Ameritron sized
their glitch resistors based on service history. I have some glitch
resistors in
my shop that Tom recommended (I believe they are RCD brand). They
came from Ameritron's parts stock.
73 de Mike, W4EF.................
----- Original Message -----
From: "2" <2@vc.net>
To: "Steve M" <wmoorejr@cox.net>; " AMPS" <amps@contesting.com>
Sent: Saturday, August 24, 2002 3:11 PM
Subject: Re: [Amps] rocky point effect, barnacle bill
>
>
> >Rich,
> >
> >I had the diode on the wrong board. It is on the ps board immediately to
the
> >right of the big ribbon cable in the pics on this site.
> >
> >http://hamradiomarket.com/Articles/Ameritron%20AL-800H.htm
> >
> >I'm not seeing a glitch resistor in these pics. Still might be in there
> >somewhere. ?
>
> ** MFJ/Ameritron's chief engineer, Mr. Tom Rauch, apparently does not
> employ glitch resistors in Ameritron amps. He said there's enough ESR in
> the electrolytic capacitors to do the job. Modern electrolytic caps do
> not have even one-third the needed R.
> >
> cheers, Steve
> >
> >----- Original Message -----
> >From: "2" <2@vc.net>
> >To: "Steve M" <wmoorejr@cox.net>
> >Sent: Saturday, August 24, 2002 5:49 AM
> >Subject: Re: [Amps] rocky point effect, barnacle bill
> >
> >
> >> A glitch resistor is in series with the HV DC supply. It limits peak
> >> discharge current from the filter caps - which is the apparent energy
> >> source for gold-sputtering from the surface of the grid. In 3-500Z
> >> amplifiers, a glitch resistor tends to reduce bending at the
unsupported
> >> mid-point of the filament helix.
> >>
> >> >Don't know. Both the Ameritron and the National survived and ran fine
> >with
> >> >normal meter readings - oops, except I did have to replace a 1N 4001
> >diode
> >> >on the AL 800H qsk board. It had to do with grid current reading too
> >high.
> >> >Grid current was showing around 125ma or more until I replaced this
> >diode.
> >> >
> >> Where is the diode in the circuit? Did it short or open?
> >>
> >> tnx, Steve
> >> >
> >> >----- Original Message -----
> >> >From: "2" <2@vc.net>
> >> >To: "Steve M" <wmoorejr@cox.net>; " AMPS" <amps@contesting.com>
> >> >Sent: Friday, August 23, 2002 8:50 PM
> >> >Subject: Re: [Amps] rocky point effect, barnacle bill
> >> >
> >> >
> >> >>
> >> >>
> >> >> >For what it is worth dept. A while back I bought a used Ameritron
AL
> >800H
> >> >> >that uses a pair 3cx800. About a minute or so after I first turned
it
> >on
> >> >> >[nothing hooked to it but the power cord] I heard a very loud bang.
So
> >I
> >> >> >shut if off and inspected for damage. Nothing found....
> >> >>
> >> >> ** does the AL-800 use a glitch resistor?
> >> >>
> >> >> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
> >> >> www.vcnet.com/measures.
> >> >> end
> >> >>
> >> >> _______________________________________________
> >> >> Amps mailing list
> >> >> Amps@contesting.com
> >> >> http://lists.contesting.com/mailman/listinfo/amps
> >> >
> >> >
> >>
> >>
> >> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
> >> www.vcnet.com/measures.
> >> end
> >>
> >
> >
>
>
> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
> www.vcnet.com/measures.
> end
>
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