The secondary winding of the impedance-matching transformer is
balanced, and has three sets of taps so arranged that proper termi-
nation is provided for 50, 150, or 600 ohm balanced operation. A
center tap is provided for use when balanced-to-ground operation
is desired.
For unbalanced 50 or 150 ohm operation, one side of
the line circuit may be connected to ground by connecting one of
the OUTPUT binding posts to the
G
binding post. (For unbalanced
600 ohm operation for output levels higher than -40 dbm, the IM-
PEDANCE switch may be set to the 600G position, in which setting
transformer T2 is bypassed and the switch connects one side of the
line circuit to ground.
)
Transformer T2 is constructed with a high permeability core to
provide uniform frequency response especially at low levels and
low frequencies.
However, where it is desired to eliminate even
the possibility of slight distortion or frequency-response errors
that might be caused by the transformer, and an unbalanced cir
-
cuit can be used, the transformer may be bypassed by use of the
600G position of the IMPEDANCE switch.
3-8
POWERSUPPLY
The power supply includes a conventional full-wave rectifier using
a
dual diode tube with
a
two-section pi filter for removing the AC
components of the rectified wave. The voltage output of the circuit
is regulated by
a
conventional electronic voltage regulator consist-
ing of tubes
V11 to V14.
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