[NJARC] AK Speaker Question

[George B. Shields, Jr.]

I agree. Best bet would be to obtain an original 8" AK speaker with 2000 ohm field winding.  It may become necessary to buy an entire AK radio and tear it down for parts - sort of like burining down the house for a piece of toast, but this is possible and may be worth it.  The 627 is a more desirable model than other AK sets using the same speaker.  It may be worth taking that route.
Running the speaker with 1K ohm power resistance in series will diminish the full effectiveness of the field coil and reduce the output quality somewhat of the existing speaker, so i'd suggest putting the correct speaker in there!-George-

STUDEBAKER: For the ride of your life!

> Date: Sat, 21 Jan 2012 21:37:25 -0500
> From: al at ar88.net
> To: njarc at mailman.qth.net
> Subject: Re: [NJARC] AK Speaker Question
> 
> Just remember 
> Reply = Poster
> Reply All = Everyone
> 
> _________________________________________________________
> 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
> > Reply = Poster
> > Reply All = Everyone
> >
> > _________________________________________________________
> > 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/
> 
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