[R-390] R390-A big knob removal

[Studiumtelecom S.Rocha]

Thanks to all tips and instructions,  I could take both knobs off the
radio. Ready for painting!
73s
Sam Rocha

Em dom, 24 de out de 2021 15:31, Tom M. <courir26 at yahoo.com> escreveu:

> All of the knobs use the same Bristol wrench unless someone has replaced
> the spline screw with something else.  Look at the screw and confirm the
> shape required.  I obtained a radio once that had an Allen screw on one of
> the knobs.
>
>
>
> On Sunday, October 24, 2021, 01:04:15 PM CDT, Studiumtelecom S.Rocha <
> battcharger at gmail.com> wrote:
>
>
> Hi Friends,
> I got one r-390A Amelco I, serial #1596, would like to paint the knobs, but
> but how can I  take the big knobs out from the radio? I have the Bristol
> key for the smaller knobs.
>
> I still did not switched it on, first I have  change  the C553 crystal
> killer. The radio is complete and was stored for many years.
> Thank you all for the answer and help!
> 73s
> Regards,
> Sam Rocha
> Py1dkw
>
>
> Em sáb, 23 de out de 2021 10:38, Jordan Arndt <Outposter30 at shaw.ca>
> escreveu:
>
> > Hi group....
> >
> > The 1960 S-W 390A I'm working on has no Line Level meter and I'm looking
> > at
> > re-working a couple of the correct size and style of meters that I have
> on
> > hand to install as such.
> >
> > Has anyone determined whether the original meter had copper oxide
> > rectifiers
> > inside the meter..?
> >
> > Was it a single diode, a full-wave or a bridge rectifier...?  I've gone
> > through the archives and haven't found a definitive answer to that
> > question.
> >
> > One of the 390As I have has a substitute Line Level meter and a diode
> > bridge
> > external to the meter which works well enough for my purposes so I'd be
> > happy to copy that circuit until I can find an original Line Level meter.
> >
> > I've already installed a replacement Carrier meter with an LM741 op-amp
> > ckt.
> > driving a substitute meter which works very well.
> >
> > Any info will be greatly appreciated...
> >
> > 73...Jordan VE6ZT
> >
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