25 Aug
2004
25 Aug
'04
6:57 a.m.
From: "Tom Jennings" <tomj(a)wps.com>
THe worst part -- the motor had a trimpot in series with it, and that
was the sole motor speed control -- and! -- tapes written at one speed
adjustment could not be read at another speed!
Of course I turned the pot, my fault. But just tapping it was enough. It
was total crap.
Hi
Most of these motors used an internal centrifugal speed
governor. These were designed to work within some span
of input voltage. I would guess that the pot was to drop
the voltage to be within this range. If one was to adjust
the pot, there should be a range of adjustment that the
speed ( with load ) was relatively constant. One would
adjust the pot to be safely within this span.
Dwight
2 Sep
2 Sep
11:47 a.m.
>From: "Tom Jennings"
<tomj(a)wps.com>
>
>THe worst part -- the motor had a trimpot in series with it, and that
>was the sole motor speed control -- and! -- tapes written at one speed
>adjustment could not be read at another speed!
>
>Of course I turned the pot, my fault. But just tapping it was enough. It
>was total crap.
On Wed, 2004-08-25 at 11:57, Dwight K. Elvey wrote:
Most of these motors used an internal centrifugal speed
governor. These were designed to work within some span
of input voltage. I would guess that the pot was to drop
the voltage to be within this range. If one was to adjust
the pot, there should be a range of adjustment that the
speed ( with load ) was relatively constant. One would
adjust the pot to be safely within this span.
Not this one. I distinctly recall spending HOURS trying to recover my
tapes, with a 'scope and listening to the data whine on the built-in
speaker. Speed was proportional to the pot setting. Maybe I got an early
one, or something, but it was crap.
The whole package was of poor quality too. I actually threw it out
within a few years.
7416
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7424
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