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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
>
