[GreenKeys] M28 - mystery LESU

[Duncan Brown]

John,

The metal plate the PS is mounted on looks the same as the others, so I 
think it is stock Teleype Corp., but may not be original to this TT-69A

Duncan

On 7/14/2025 9:29 PM, John, W9DDD wrote:
>
> I looked at that power supply and kind of wondered if it were 
> homemade?  One could have taken a blank plate and made their own.  I 
> say that without having seen real older versions of Teletype or 
> military power supplies, but none I've ever seen look like that one. 
> Teletype versions mount the transformers differently.  However it does 
> look to be well made.
>
>
> On 7/14/2025 5:31 PM, Duncan Brown wrote:
>> John,
>>
>> That looks like the right schematic!
>>
>> Nick had identified it as an early Navy unit, TT-47 (actually a 
>> TT-69, since it is a table model) and sent me to the manual, NAVSHIPS 
>> 91713, which shows the LESU wiring color codes (fig 3-3) that matches 
>> this unit.
>>
>> Nick - you questioned the DC supply ("rectifier") in this LESU.  In 
>> NAVSHIPS 91713, p 1-12, there is a note about an optional rectifier 
>> an it shows up in fig 3-1.
>>
>> The military nomenclature plate had been removed, or I would have 
>> known where to look for documentation.  I can see a spot on the 
>> cabinet under the keyboard, where a label has been removed. there is 
>> also a red inspection? stamp that looks military?   See pic.
>>
>> Thanks!!!
>>
>> Duncan
>> K2OEQ
>>
>>
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