[JMS] 90281 power supply

[David@Eppert.ca]

I have three of them. They are all different.  I will take a fresh look and send the differences. 

David VE7CN
 
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> On Nov 2, 2021, at 6:52 PM, Don Buska - The Radio Lab Works <don at radiolabworks.com> wrote:
> 
> Hi Brian. My #168 supply still has the removable bells on the HV transformer.  Mine doesn't have the HIGH/LOW switch either.  I wonder if your 139 and 157 supplies are also absent the HIGH/LOW switch?
> 
> Sorry can't help much on the transition when the hermetical sealed transformer came along, if it truly did.  There are a few with higher S/N's on our JMS website so we should soon know if there was a real transition in the 200's and above.  Naturally if we do determine such a transition we'll need to get a back side picture and add it to the JMS website as well.
> 
> 73
> Don N9OO
> 
>> On 11/2/21 6:52 PM, Brian Harris via James_Millen_Society wrote:
>> I have three 90281 power supplies with serial
>> numbers 139, 157 and 237.
>> 
>> The two earlier numbers have power transformers which have removable end bells. The later one has a larger, hermetically sealed transformer.
>> 
>> Assuming the hermetically sealed unit is original, does anybody have a supply later with the hermetically sealed transformer?   Does anybody know when the change was made and why?
>> 
>> I’m asking these questions because I am going to sell one of my supplies and I don’t want to sell the best version, if there is one.   If one is no better than the other, I will sell the hermetic version because doing so would leave me with a spare supply with the correct transformer and, more important, one which could easily be rewound if I should have a failure.
>> 
>> Thanks for your time.
>> 
>> Brian Harris WA5UEK
>> Sent from my iPhone
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