[vcf-midatlantic] Any trick to discharging ADM-3A

Jason Perkins perkins.jason at gmail.com
Thu Feb 8 10:12:45 EST 2018


Is it a good idea to unhook the tube from the chassis / electronic ground
before discharging?

On Thu, Feb 8, 2018 at 10:10 AM, Ian Primus via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> Yeah, of course - you can disconnect the neck without discharging the
> tube. There's no danger there. You can clip on to any part of the
> metal mounting ears of the tube, the implosion band, or that spring
> that stretches across the bell of the tube. That's all connected to
> dag ground.
>
> -Ian
>
> On Thu, Feb 8, 2018 at 8:51 AM, corey cohen via vcf-midatlantic
> <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> > Ok.  Well then let me ask you and Ian this..
> >
> > Can I safely disconnect the plug at the end of the CRT neck without
> discharging?
> >
> > That would make it easier to take the tube out while the anode wire is
> still connected and then in can discharge the tube with a screwdriver.
> >
> > Also is the best place to clip onto the implosion bracket since the ADM
> doesn’t really have a metal chassis?
> >
> > Thanks,
> > Corey
> >
> > corey cohen
> > uǝɥoɔ ʎǝɹoɔ
> >
> >> On Feb 8, 2018, at 12:01 AM, Joseph Oprysko via vcf-midatlantic <
> vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> >>
> >> I’ve done the screwdriver trick myself. Because often, even after
> waiting a
> >> few weeks, there can still be enough voltage to make your hair stand on
> >> end. LOL
> >>
> >> On Wed, Feb 7, 2018 at 7:05 PM Ian Primus via vcf-midatlantic <
> >> vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> >>
> >>> I don't remember any particular trick or real difficulty in doing it.
> >>> Maybe you needed to get the tube loose to get the screwdriver in
> >>> there? But I thought it would fit in there without too much problem. I
> >>> know I've done it a whole bunch of times and nothing sticks out at me
> >>> as being out of the ordinary about working on the 3A. Remember you
> >>> don't need to disconnect the anode connection right away, just
> >>> discharge it.
> >>>
> >>> If you're doing a lot of work on one of those monitors, sometimes you
> >>> do need to get a bit creative though:
> >>>
> >>> https://i.imgur.com/k2wPmw3.jpg
> >>> https://i.imgur.com/UwU3gek.jpg
> >>>
> >>> -Ian
> >>>
> >>> On Wed, Feb 7, 2018 at 6:29 PM, corey cohen via vcf-midatlantic
> >>> <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> >>>> So I was about to swap out my ADM5 for my ADM3a with my ALTAIR and
> >>> realized while I did replace the electrolytic and tantalum caps on the
> main
> >>> board, I didn’t change the electrolytic caps on the analog board
> behind the
> >>> tube.
> >>>>
> >>>> No big deal except that the rubber cup is on the top where I can’t get
> >>> to it without removing the tube and you aren’t really supposed to
> remove
> >>> the tube till you discharge it under the rubber cup.    So chicken or
> the
> >>> egg?
> >>>>
> >>>> Or am I just supposed to let the ADM sit unplugged for a few weeks and
> >>> just assume it self discharged?
> >>>>
> >>>> Just when I thought I was finished with this project and was going to
> >>> move onto my TI silent rebuild.
> >>>>
> >>>> Thanks,
> >>>> Cheers,
> >>>> Corey
> >>>>
> >>>> corey cohen
> >>>> uǝɥoɔ ʎǝɹoɔ
> >>>
> >> --
> >> Normal Person: Hey, it seems that you know a lot.
> >> Geek: To be honest, it's due to all the surfing I do.
> >> Normal Person: So you go surfing?
> >> Normal Person: But I don't think that has anything to do with knowing a
> >> lot...
> >> Geek: I think that's wrong on a fundamental level.
> >> Normal Person: Huh? Huh? What?
>



-- 
Jason Perkins
313 355 0085



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