[R-390] R390-A big knob removal

[Tom M.]

 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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