[JMS] 90711 VFO questions

[THOMAS SMITH]

Hi Millen Society,
I need to downsize my ham radio collection.
I have all the stuff necessary including the VFO, the transmitter, the modulator, the amp and the power supply except the Millen supply doesn’t have enough lead in its butt to supply the amp with the required HV. I would prefer not selling this gear piecemeal.

I’m in the Houston, TX area so shipping really isn’t an option and therein is the problem. I’m open to reasonable offers and suggestions. I’m willing to share in the transportation for a reasonable distance.

I have original manuals for some of this gear (such as they were with Millen). Millen generally didn’t go to a lot of trouble to provide first rate manuals with their gear.

I also have pictures of the gear (with some of my gear found on the JMS site and can take additional pics if necessary. I would prefer not taking and providing a bunch of additional pictures to “tire kickers”.
Thanks
Tom N5AMA


Sent from my iPhone

> On Oct 28, 2024, at 6:35 PM, W1LSB - George via James_Millen_Society <james_millen_society at mailman.qth.net> wrote:
> 
> Hello all!
> 
> 
> 
> After a lengthy search, I finally acquired a 90711 VFO thanks to a tip from
> Bob - W9RAN, who knew that I was on the hunt for one  Since acquiring it, a
> few questions have come to mind that one of you may be able to answer.  
> 
> 
> 
> I've seen that two variants of the RF output connector have been noted on
> the serial number page of the JMS web site; one with a 2 pin banana jack,
> and one with a UHF connector, like mine has.  The serial number of my unit
> is 309, however, I found a photo of the VFO with a two pin banana jack for
> the RF output; it was serial number 287.   It sounds like they may have
> changed connectors somewhere between the two units.  
> 
> 
> 
> Another question is whether the high impedance plug-in adapter was standard
> or optional.  The manual seems to imply that it was standard, however I
> gather that not everyone has one with their VFO; I do not.  The adapter was
> used to provide a high impedance output versus the standard low impedance
> output.   Apparently, the plug-in adapter was made in both banana plug and
> UHF connector versions as well, again per info on the JMS serial number
> page.  
> 
> 
> 
> Just curious as to whether anyone know more about these differences, and
> whether the high impedance plug-in adapter actually provides a benefit.
> Interestingly, the VFO could be used a vintage QRP rig all by itself, given
> that manual claims the RF O/P is around 1.75W
> 
> 
> 
> Once this VFO has been restored, I'm planning to use it with a 90801 exciter
> and 90831 modulator, and eventually a 90881 RF amplifier with a high level
> modulator.
> 
> 
> 
> Thanks & 73,
> 
> George - W1LSB
> 
> 
> 
> 
> 
> 
> 
> 
> 
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