[Hallicrafters] PM-23 speaker specs

[~DA~]

That was me (well one of us anyway!). Thanks for the
rest of the numbers!

Doug

--- Ken Kaplan <krkaplan at cox.net> wrote:

> I think I remember someone asking a question about
> the speaker in a PM-23. If so, 
> here are the specs as measured from my very good but
> old condition PM-23 
> speaker. The paper cone is 60+ years old which means
> dry & a bit brittle. Until the 
> time machine is repaired, I guess we'll just have to
> assume that these measured 
> numbers are kinda close to original.
> 
> Fs = 55 Hz
> f1 = 49 Hz
> f2 = 65 Hz
> Qms = 7.37
> Qes = .602
> Re = 3 ohms
> Le = .375mH
> 
> Sorry but I didn't measure Vas. These were free air
> tests using good quality test 
> equipment (Wavetek, Fluke). If you want an impedance
> curve, just holler. How does 
> this speaker compare to newer ones of similar size?
> Fs is a bit high but that probably 
> came with age. Otherwise its ok. I just wouldn't
> dump any rap (or Tchaikovsky's 1812 
> Overture) into it or the cone would probably shred.
> 
> 73 Ken kb7rgg
> 
>
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