Kennedy 9800 - Power-up tips?
robert626001 at gmail.com
Thu Apr 23 12:53:14 CDT 2020
I'm under caffeinated and not really with it yet, having recently gone semi
nocturnal, so you'll want to double check this with someone who's actually
That said, variacs aren't a universal panacea and can sometimes be harmful
rather than helpful. My disorganized memory is offering TVs as an example,
but take that with a pinch of salt. I've only ever used them with tube
radios and amps, so have nothing further to offer, save this caution.
On Thu, Apr 23, 2020, 10:59 AM Anders Nelson via cctalk <
cctalk at classiccmp.org> wrote:
> Cool, thanks for your take. I found some articles:
> - http://www.angelfire.com/electronic/funwithtubes/Restore_cap.html
> Given this unit doesn't have any tubes, I imagine the motor drivers/amps in
> this thing would simply go to zero output with shorted caps. The PSU might
> blow the fuse and/or rectifier with a shorted bulk output cap. This unit is
> very difficult to remove from the rack it's in so I'm trying to avoid
> preemptive repairs.
> I'm going to pick up a variac on Amazon when I finish up some other things:
> Happy to hear any constructive criticism.
> Anders Nelson
> +1 (517) 775-6129
> On Thu, Apr 23, 2020 at 12:37 AM "Grif" w. keith griffith via cctalk <
> cctalk at classiccmp.org> wrote:
> > At least in radio repair of old equipment,,,, old electrolytic caps
> > cause all sorts of issues. Most of the guys doing restoration do a total
> > remove/replace on them. In my opinion,,, I think that's a little
> > extreme,,, but then having one fail after all the other work is done is
> > also a PITA.
> > On 4/20/20 11:15 AM, Anders Nelson via cctalk wrote:
> > > Hi friends,
> > >
> > > Now that I have enough hobby time having quit my job two weeks before
> > > apocalypse, I'm interested in poking at my Kennedy 9800 tape controller
> > > project.
> > >
> > > I bought the tape unit in Q3 2017 and the seller said they had powered
> > > up and nothing seemed awry. I have not powered it up and reading about
> > old
> > > electrolytic cap issues I'm curious if I should do anything beyond
> > replace
> > > any obviously leaking/ruptured capacitors.
> > >
> > > IIRC people have used a variac to gradually bring the power supply up
> > > operating voltage and somewhat refresh the capacitors - is this a
> > Is
> > > this advisable?
> > >
> > > Any help is appreciated!
> > > --
> > > Anders Nelson
> > >
> > > www.erogear.com
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