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

Ian Primus ian.primus.ccmp at gmail.com
Thu Feb 8 10:10:43 EST 2018

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.


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?

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