[JMS] Millen amp + exciters on the air

[Don Buska - The Radio Lab Works]

Hi Dennis.  Great work on the amplifier.  I'm sure it feels great, as it 
should, to get the 90881 on-the-air again.

Please not qth.net email reflectors don't allow for attached or embedded 
photos.  You would need to store them some place that can be linked via 
URL that people could link to while reading your messages here.

Thanks for the 90881 progress report.

73
Don N9OO

On 6/9/21 6:03 PM, dennisbrady at juno.com wrote:
> I just got the 90881 amp 'restored' and on 20 M  with a pair of T-40's.
>
> Plate tank and grid coils are B & W plug in units.. The genuine JM coils
> are pretty rare and I've never seen any at swap meets, etc.  The mods
> to use B&W coils ( aka BC-610 ) are easily reversed with a soldering iron..
>
> The amp performs well and was easily neutralized and is quite tame with
> no parasitics.. I did need to add a shield can over the grid coil to prevent
> feedback oscillation on the same band as the coil set...
>
> The pix show the innards with meter shield and 'balancing plate' added
> to back of the chassis.. Not really a 'restoration' as much as a functional
> repair.. These JM units are my every-day-drivers rather than shelf queens.
> I'm a function over form type guy, anyhow...
>
> Included are the pix of the 90880 exciters that cover 80/40/30/20. I have
> B&W coils sets for 160 - 10 M..
>
> C U this weekend on the SKCC WES 20M with the T-40's..
>
> 73 de W5FRS
> Dennis
>
>
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