Tape Recording Magazine - AmericanRadioHistory.Com

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BOLD LINES ARE ADDITIONS
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Figure 2. A -A simple connection
that will work on most radio sets.
The volume control is the best takeoff
point for recording. Note 25,-
000 ohm resistor which may be incorporated
in the plug. B -For
AC /DC sets and TV sets which
may have a voltage on the chassis,
it is necessary to hook up a transformer
to prevent this voltage from
reaching the recorder and causing
hum. In stubborn cases, where ordinarily
the hookup shown in A
should be sufficient, B must be used
instead.
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Figure 3. While simply making a
connection to the voice coil of the
speaker will often produce good
recordings, the best way to do it
is shown in the drawing. This eliminates
any possibility of hum and
takes care of those speakers which
may be grounded on one side. A
I watt, 2000 ohm carbon resistor is
connected to each line and across
these is connected a 5 ohm, 2 waft
carbon resistor. The transformer is
hooked in as shown to give isolation.
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