[R-390] Selenium rectifiers

[Bob Camp]

Hi

Since they switched out the tubes in the high voltage I'm sure you  
are right. As soon as the selenium's got tough to find they would  
have stuck in a terminal strip and done something.

Bob


On Jun 21, 2007, at 5:03 AM, Sheldon Daitch wrote:

> I understand the idea of keeping BAs as BAs, but I wonder, what  
> would the military
> do with the selenium rectifier stacks, if the PP-629 was still in  
> service?
>
> My gut feeling is there would have been a modification kit sent out  
> to the field to
> change out the rectifier.
> 73
> Sheldon
>
> Don Reaves wrote:
>
>>
>> I asked this question because I have one of the R-391 matching 28V  
>> power
>> supplies, PP-629.  It has a beautiful selenium rectifier stack in  
>> it about
>> the size of a loaf of bread.  I'm going to leave it alone and use  
>> it as is.
>> It's job is to run the autotune circuits in the R-391.
>> My elmer used to call these things rectum finders.  I suppose  
>> there was some
>> double meaning to that term based on their failure modes, but as a  
>> kid I
>> knew not.
>>
>> <grin>
>>
>> Don
>>
>>
>>
>>
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