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There are some small amplifiers from the '50s, '60s
that had the output transformer mounted to a standard
permanent magnet speaker. I think the "field coil"
type speaker went out of use around the late '40s.
--- unlunf <> wrote:
> Mike,
>
> I can't find a definitive history of the Cadet on
> the web, but
> the several models I saw were from the mid 50's and
> later, so
> I'm surprised at the speaker being straight out of
> the late
> 30's or early 40's. The "transformer" on the back
> is what we
> called a "field coil", it did double duty.
>
> In a nutshell, it was the standard technology before
> permanent
> magnets came on the scene. It created the magnetic
> field around
> the voice coil while it was energized (whenever the
> power was on),
> and it also served as the choke coil in the power
> supply circuit.
> This made the thing "half as expensive" from a
> manufacturing
> standpoint, doing two jobs instead of one like that.
>
> In theory, you shouldn't replace the old speaker
> with a new type,
> but I've seen it done, and it didn't sound any worse
> than when
> the amp was new. (These things were notoriously
> noisy.) To do
> this, you'd have to carefully remove the coil from
> the old speaker's
> frame, and mount it somewhere inside the chassis.
> You also have an
> impedance matching issue, many of those older beasts
> didn't have
> their ohms rating marked at all, let alone clearly
> enough to stand
> the aging of several decades. 8 ohms is a good
> start, and unless the
> sound is wildly distorted, that should be good
> enough for general use.
>
> HTH
>
>
> unlunf
>
> --- In ,
> "urbansurfkings" <surfkings@...> wrote:
> >
> > I need to replace the blown 6" speaker on my
> Danelectro Cadet amp. I
> > notice the speaker has a transformer type thing on
> it (on the speaker
> > housing). Can I replace the speaker with one that
> doesn't have that
> > on it?
> >
> > I'm looking at the MOD 6-15 from Jensen. Will this
> work?
> >
> >
>
> >
> > Thanks,
> > Mike
> >
>
>
>
>
>
>
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