[NJARC] AK Speaker Question

[Al Klase]

Hi Jerry,

First, the way I read Rider's, the AK 72 has a 5-pin connection to the 
speaker.  This makes sense, as the 72 has push-pull triode outputs.  
That means a center-tapped transformer on the speaker.

You might be able to get away with this in the 627, using the entire 
transformer primary connected to the single 47 tube, a pentode with 
higher impedance.

The real challenge will be the 1000 ohm field coil.  This resistance is 
involved in supplying the grid bias to the 47.  Perhaps a 1K / 
couple-of-watts resistor in series with the field coil will allow the 
thing to work.

I'd look a little more for the proper speaker.

Al

On 1/21/2012 7:46 PM, Jerry & Karin Dowgin wrote:
> Just remember
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> _________________________________________________________
> Greetings
>
> I have been looking for some time for a speaker for a AK 627 cathedral
> with no luck.  There are many other models that are 2000 ohms and would
> work, like the models 80, 82, 84, 90, 92, 94, 228, 567, 558, 627.  I
> found a AK model 72 (console) 1100 ohms for sale.  Will 1100 ohms be to
> little for a set that used 2000 ohms?  The model 72 has the same four
> plug lead as the AK 627.
>
> Jerry Dowgin
> Cell 908 770 9695
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/