[time-nuts] Curious, how many t-nuts have 5065A
cjaysharp at gmail.com
Sat Feb 24 06:12:22 EST 2018
It looks rough, there's a cesium standard for sale in the UK, time nuts
member perhaps, that's sat at a quarter of the price, I know which I'd buy.
On 24 Feb 2018 10:46, "George Atkinson via time-nuts" <time-nuts at febo.com>
> There is one on UK ebay at the moment but its not being given away. From
> the one partial photograph it looks a bit rough.
> Robert G8RPI.
> > On 24 February 2018 at 10:02 John Miles <john at miles.io> wrote:
> > > >
> > > Hi
> > >
> > > Well, if anybody else is “giving away” 5065’s I’d certainly be
> willing to
> > > “accept”
> > > one :)
> > >
> > > Bob
> > >
> > > >
> > Be careful what you wish for. :) The unit Pete is talking about is a
> 1969-era model, in nice overall shape but with the usual bad capacitors on
> the oven controller board. The lamp oven winding should be about 50 ohms
> cold, but is closer to a dead short. It will take a LOT of work to restore
> to working condition.
> > The failed controller ran long enough to smoke a 1.5-ohm 1W
> resistor, 1N400-something diode, and eventually the 1A line fuse (
> http://www.ke5fx.com/5065A_A11_sm.jpg ). Needless to say the lamp PCB
> looks like something out of Fukushima. It'll need to be rebuilt from
> scratch after rewinding the heater.
> > Seriously -- anyone with a 5065A who hasn't checked/replaced the
> caps on A11, don't let this happen to you. They aren't making any more of
> these puppies. If the caps on that board are original, don't bother to
> check them, just replace them, as Luciano suggests at
> http://www.timeok.it/hp5065a-corner-3/. No need for exotic parts, just
> put in whatever you have that is somewhere close to the original values.
> > Not a bad idea to verify the ESR of the new parts you're installing
> as well.
> > -- john, KE5FX
> > Miles Design LLC
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