[GreenKeys] M19 Selector Magnet - magic smoke?

[John W9DDD]

Part of that is due to a renumbering that happened at Teletype.  For some reason (computerization?), alpha prefixes had to be made postfix instead of postfix. 

M207 and 207M should be the same part.  The resistance difference can be a combination typos and whether it's measured installed in parallel with another.

Our friendly navy-radio chart for coils says a single 207M is 100 ohms.  Two in parallel would be 50.  

John, W9DDD


> On Aug 2, 2021, at 12:39 PM, Jim Cooper <jim.w2jc at gmail.com> wrote:
> 
> On 2 Aug 2021 at 14:47, John Thurmond via GreenKeys 
> wrote:
> 
>> Thanks for all the feedback on
>> this. I'll check both magnets and see
>> what the results look like.Fuses are
>> a good suggestion - very much a
>> learning process here :) Is there any
>> particularly good source for new
>> magnets?
> 
> I have a junk M-14 FPR typing reperf 
> (except the whole typing basket is gone!) 
> so I was checking to see if the selector 
> magnet coil(s) from that were interchangeable 
> with the M-15 selector magnet. 
> 
> An interesting quirk I found .... 
> 
> The M-15 'holding magnet' coils are numbered 
> M-207 with a 92 ohms per coil spec; 
> 
> The M-14 FPR magnet coils are numbered 
> 207M with a 550 ohms per coil spec. 
> 
> Hmmmm.... duh ...  seems weird to have two parts 
> with such similar part numbers. 
> 
> 
> 
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