General Radio Company RAYTHEON “B”ELIMINATOR Voltage Source
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RAYTHEON “B”ELIMINATOR
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Informacja
When used with a highly sensitive radio set the kit should
be located at least three and preferably five feet away. If
used with a less sensitive receiver it may be found, on
trial, that a smaller distance will be satisfactory. On the
other hand, a much greater separation is not desirable. The
attachment plug and cord, extended if necessary, should be
run to a lighting receptacle or wall outlet and should be
kept as far as practicable from all wires leading to the
radio set, including antenna and ground.
Tiwo or three wires for carrying the “B” battery potentials
to the set may be run in the usual manner. The output from
the radio receiver should be carried to the input terminals
of the kit by a double telephone cord or a pair of twisted
leads which should be kept separate from the “B” battery
leads. A similar conductor should be used connecting the
loudspeaker to the output terminals.
Under certain conditions better quality can be obtained
merely by interchanging the input leads at the input
terminal posts.
The majority of radio sets have the positive or negative
filament terminal connected to ground. This provides a
sufficient grounding for the eliminator. With sets wherein
the filaments are not grounded and those employing an
ungrounded loop, it may be advisable to ground them through
a condenser of from two to four M. P. capacity. This ground
is unnecessary in many cases but under certain conditions it
is desirable to reduce the alternating current hum. If the
kit is used merely as a power Amplifier it may be desirable
to ground the B— terminal.
A word of caution should be added here concerning the
attempt to measure the voltage at the “B” battery terminals
of the kit. The ordinary, inexpensive, voltmeter draws so
much current that the increased load on the kit lowers the
voltage considerably so that the readings of such a meter
are meaningless unless the meter load is known and taken
into account. Reliable results may be obtained by using a
five milli- ampere meter connected in series with a
resistance of 100,000 ohms. Such a voltmeter draws only one
milliampere per 100 volts deflection, which is permissible.
Tests have shown that, on the average, using the type HB
Raytheon and with the UX-171 tube in the circuit, the open
circuit voltage at the —(—90 terminal is about 145. This
potential drops at a rate of 3.25 volts per milliampere of
current drawn from this terminal. The open circuit voltage
at the —(—40 volt terminal is about 50 and this diminishes
at a rate of 2.23 volts per milliampere load from this
terminal. These values meet the requirements of the great
majority of radio receivers.
It is possible to use either a UX-112 or a UX-210 tube for
the power Amplifier, but for the best quality of
reproduction the UX-171 tube is recommended.
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Instrukcja obsługi
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11
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11.48 Mbytes (12039662 Bytes)
Język:
english
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Skanowany dokument, wszystko czytelne.
Data przesłania:
2016 12 30
MD5:
43eb1547ed8242674f6b20219471abe4
Pobrane:
902
Informacja
Assembly Manual