[time-nuts] Looking for Gen Rad 1101A oscillator/parts

[jmfranke at cox.net]

Hi,

The GR 1101A thermometer thermostat is similar, but not the same dimensions. The GR 1101A has one bent thermometer that is visible from the front panel but does not have any contacts. The other thermometer/thermostat is deep within the crystal oven, is also bent, and does have the contacts. As you know, the thermostat switching temperature is fixed at manufacture. However, in the GR 1101A, they provide a small variable heat source to bias the thermostat and thus allow for a small range of adjustment. 

Your oven system is quite interesting and a bit of engineering artistry. Depending on your intent, I would be tempted to try and replace the outer cover with a Plexiglas cylinder to reveal the inner details. But, the heaters may get in the way. As a project aside from the GR 1101A, I may make an oven similar to yours for a Bliley BG9D 100 kHz crystal and mount the heater resistors on the main central plate and housed within a clear outer cylinder. 

I am also restoring a couple battery powered GR Type 275 crystal oscillators. The 275 oscillators were the first commercially available crystal oscillators. I have two that are complete with the wooden boxes and one missing the box. I have spare parts to replace ones that were damaged but I am always looking for more of the plugin pancake tuning coils and crystals. 



---- Dave Brown <tractorb at ihug.co.nz> wrote: 
> John
> Was the mercury device anything like one of these? This is an old  UK origin dual xtal oven ex open wire carrier equipment. Still has one original glass xtal but one has been replaced with a more 'modern' holder style.
> http://homepages.ihug.co.nz/~tractorb/old%20xtal%20oven/
> DaveB, NZ
> 
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of jmfranke at cox.net
> Sent: Friday, April 07, 2017 7:59 AM
> To: time-nuts at febo.com
> Subject: [time-nuts] Looking for Gen Rad 1101A oscillator/parts
> 
> I am trying to restore a clunker  General Radio 1101A crystal oscillator. The unit I have is missing several parts including the mercury thermostat switch and parts of the oven box, and maybe more. I am looking to buying one or more other clunkers to get at least one of these historic devices operational again. Any help appreciated.
> 
> John Franke WA4WDL
> 4500 Ibis Ct
> Portsmouth, VA 23703
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