[NJARC] In search of an 8 inch zenith electromagnet speaker, 2150 ohms.

[John Ruccolo]

Tom,

Who knows, maybe Zenith already has a series resistor
in your set. (But I doubt it). Check the set out. The
speaker sure looked like the original Zenith to me,
but who knows, maybe it was replaced years ago by
whatever the guy had handy in his shop.

JR

--- Thomas Lee <thomas_v_lee at hotmail.com> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Hi John,
> I just thought that the correct speaker was the one
> callled for in the 
> schematic.  Also Tom provost has the same model with
> the speaker stated in 
> the schematic.  Would the ohms differ by that much
> and not make a 
> difference?  (Calls for 2150 ohms, has 1000ohm).
> 
> What did that set use, a single 6F6 for output?
> Yes.  The tube lineup is...
> 
> 6F6 Power
> 6Q7 2nd Det/1st Audio
> 6K7 I.F.
> 5Y3 Rect.
> 6A8 1st I.F.
> 
> Tom
> 
> 
> 
> Tom,
> Perhaps that's just a production variant. Do you
> have any evidence that the 
> speaker was not original to the set? Plus the
> sechmatic could be wrong. And 
> even it it's not, manufacturers frequently made
> mid-production changes.
> 
> Also, don't worry too much about feed coil speakers.
> Exact replacements can 
> be difficult to find. And from what I remember, you
> *don't* need the 
> speaker, just the output transformer (for which a
> replacement from AES or 
> Radio Daze is easy to get and fairly cheap). Also, a
> transformer from a 
> parts set should work. What did that set use, a
> single 6F6 for output?
> 
> My advice for replacing an electrodynamic speaker is
> to replace it with a 
> permanent magnet speaker and use a filter choke (or
> sometimes a resistor) in 
> place of the field coil. You're fortunate that the
> speaker is still good, I 
> think.
> 
> JR
> 
> 
>  > Visit our web site - See http://www.njarc.org
>  > _______________________________________________
>  > Hi John,
>  > the speaker that the radio has is not what the
>  > schematic calls for, it's a
>  > model 49-166X 1000 ohm, the schmatic calls for a
>  > model 49-152, 2150 ohms.
>  > Should I keep the speaker and add a resistor in
>  > series once I find a
>  > transformer?
>  >
>  > Thoughts?
>  >
>  >
>  > Tom
>  >
>  > btw go to sleep :)
>  >
>  >
>  >
>  > Tom,
>  > If this is the radio we were working on at the
>  > clinic, you DON'T NEED the
>  > speaker -- you need to replace the OUTPUT
>  > TRANSFORMER which is physically
>  > mounted on the speaker. The speaker field coil is
> OK
>  > (we tested that at the
>  > clinic), and I think we tested the voice coil and
>  > it's OK too. But check it
>  > to make sure.
>  >
>  > It should be easier just to replace the
> transformer
>  > -- it will be much
>  > harder to locate a matching speaker. The primary
> of
>  > the output trasnformer
>  > tested *open* (or you've got a broken wire
>  > someplace, but I doubt it).
>  >
>  > JR
>  >
>  >
>  > --- Thomas Lee <thomas_v_lee at hotmail.com> wrote:
>  >
>  >  > Visit our web site - See http://www.njarc.org
>  >  >
> _______________________________________________
>  >  > if you have one send a pic, and a price :)
>  >  >
>  >  > thx
>  >
>  >
>  > _______________________________________________
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>  >
> 
> 
> 
>        
>
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