[time-nuts] Re: General Radio 1105-A Frequency Measuring Equipment, parts wanted.

[paul swed]

Stijn
A very nice picture of the complete system.
I assume your in the Netherlands. I actually have seen various components
in a basement in NJ. At least I am pretty sure thats what I had seen.
But that also means shipping would be very costly.

With respect to the oscillator I agree with Bob return it to the original
state if possible.
These days finding the types of parts that are used in the system are
becoming more difficult. 1/2 watt and larger resistors that can handle the
various voltages. At least with tubes while hamfests still existed they
actually didn't seem that hard to come by. I picked up numbers of NOS tubes
for WWII radios without any issue. They worked well.
Would be great to see the system working again. Then you can hook up a GPS
system to it and make the worlds most heavy GPSDO.
Good luck.
Paul
WB8TSL





On Mon, Aug 23, 2021 at 9:36 AM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> There is a General Radio list
>
> GenRad at groups.io <mailto:GenRad at groups.io>
>
> That would be a pretty good bet for finding the various connectors.
>
> I last saw (and unfortunately did not buy) one of these beasts back
> in 1973. I can’t say I dug very deep into it on the dealer’s floor. From
> what little I remember, you best bet on the oscillator may be to wire
> it back as close to the original schematics as you can.
>
> Next bit of fun is going to be finding working versions of the ocean
> of tubes it uses …..
>
> Bob
>
> > On Aug 23, 2021, at 9:15 AM, Stijn <pe1rks at xs4all.nl> wrote:
> >
> > Seems that the pictures got scrubbed:
> >
> > Links:
> >
> > The equipment I am working on:
> > https://www.pe1rks.nl/plaatjes/GR_1105A/IMG_0030.JPG
> >
> > The GR 774 connectors that I am after:
> > https://www.pe1rks.nl/plaatjes/GR_1105A/IMG_0115.JPG
> >
> > The mains connectors that I am looking for need to fit these:
> > https://www.pe1rks.nl/plaatjes/GR_1105A/IMG_0116.JPG
> >
> > The oscillator module that I would like to replace:
> > https://www.pe1rks.nl/plaatjes/GR_1105A/IMG_0013.JPG
> >
> > Sincerely,
> >
> > Stijn
> >
> > Op 23-8-2021 om 15:04 schreef Stijn:
> >> Fellow Time-nuts,
> >> I have for some time a General Radio 1105-A and I have started to
> resurrect this two rack Frequency Standard combined with Frequency
> Measuring Equipment.
> >> There are some repairs to be made and some units require some more in
> depth restoration, but to be able to complete this task and get all working
> like it once should I need some parts.
> >> What I need are some General Radio 774 connectors, 8 to be exact:
> >> I am also in need for 6 of the connectors fitting this mains entry:
> >> And the worst part is the Piezo Oscillator, the Quartz bar is there and
> in good condition the oven is also working. But the oscillator circuit has
> been heavily modified.
> >> Instead of the original bridge circuit they have build a totally
> different oscillator and I can't get this to work.
> >> So here are my questions:
> >> Does anybody have or know a supplier for the needed connectors?
> >> Is there someone out there who has just the Oscillator module for the
> Piezo-Electric Oscillator and is willing to sell and ship this?
> >> Sincerely,
> >> Stijn Nestra
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