[JMS] Solid State 90903 scope

Brian Harris cosmophone at yahoo.com
Wed Dec 8 10:00:38 EST 2021


I will take some better pictures of my two units and send them to you. They do not have plug in rectifiers unless there is one hidden inside a box that’s attached to the chassis on one. I’ve yet to open that box but it has to have the transformer in it. 

Sent from my iPhone

> On Dec 8, 2021, at 8:23 AM, Don Buska - The Radio Lab Works <don at radiolabworks.com> wrote:
> 
> Hey Brian,
> 
> From the schematic on our JMS website it indicates the solid-state power supply on the 90903 is a 8-pin plugin unit. I have the older 2X2 rectifier tube version so can't help in your investigation. However, I did notice we don't have any pictures of the 90903 on the site, so your pictures will be most welcome.  Don't know why I never added my 90903 pictures, but it is now on my list to do so.
> 
> Thanks es 73
> Don N9OO
> 
>> On 12/7/21 6:59 PM, Brian Harris via James_Millen_Society wrote:
>> I have two of these. Both are very different from one another and both have no tube rectifier. I have only looked at one closely and I haven’t found a solid state diode anywhere (yet).  What’s your knowledge of these versions. Pictures available on request.
>> 
>> Brian WA5UEK
>> Sent from my iPhone
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