FH -- 1M -- 3/60

SP ECIFICATIONS

Gain:

Power Output:
Frequency Response:
Input Impedance:
Source Impedance:

Load Impedance, Line Output:

Load Impedance, Recorder Output:
Noise Level:

Controls:
Power Supply:
External Power Available:
Tubes:
Dimensions:
Color:
Weight:
Accessories:

97 db max. Channels 1 -- 2 -- 3 -- 4
55 db max. Channel 5 (17 mv in for 0 dbm output)
+ 18 dbm or 50 v open circuit
~ 1 db 30-15,000 cps
1 megohm, Channels 1, 2, 3, 4; .25 megohm Channel 5
30/50 and 120/200 ohms Chan. 1, 2, 3, 4 with
4722 plug-in microphone transformer
15,000 ohms to infinity
150 and 600 ohms with 15095 plug-in line transformer
270,000 ohms and 100 mmf. min.
Equivalent input noise -- 123 dbm
Output noie -- 68 dbm with master gain control closed
5 mixer, master, bass, treble and illumination control

117 volts, 60 cps, 20 watts
117 volt ac receptacle on chassis
3 -- 12AX7, 1 -- 6CG7
5'/~" H x 19" W x S'IL" D
Dark green
10'/~ lbs.
12862 VU Meter Assembly
12864 Phono Equalizer Assembly
12863 XL Connector Assembly
12866 Portable Carrying Case
4722 Plug-in Microphone Transformer
15095 Plug-in Line Transformer

ARCHITECTS AND ENGINEERS SPECIFICATIONS

The mixer preamplifier shall be of the (choose one) rack mounting type/portable type.
It shall consist of four high gain channels with gain of at least 97 db, and one low gain
channel with gain of at least 55 db. In addition to individual gain controls on each of
these five channels, the mixer preamplifier shall have an over-all master gain control,
as well as over-all bass and treble controls.

The frequency response shall be -- ~ 1 db 30 to 15,000 cps. The input impedance shall
be (choose one) 1 megohm (or) 30/50 and 120/200 as provided by a plug-in input
transformer specified elsewhere. The low gain input shall have an input impedance
of .25 megohms. The load impedance shall be (choose one) at least 15,000 ohms (or)
150 and 600 ohms, as provided by a plug-in line transformer specified elsewhere. In
addition to this line output, the preamplifier shall be equipped with a recorder output.

This recorder output shall be unaRected by adjustments of the master gain control
or of the tone controls.
The maximum output of the preamplifier shall be at least (choose one) 50 volts open
circuit (or) + 18 dbm with the plug-in line transformer. Equivalent input noise shall
be not greater than -- 123 dbm. Input and output connections shall be made by means
of (choose one) screw terminals (or) Cannon XL connectors (as required, the following
additions may also be included in this specification) (1) The preamplifier shall be
equipped with VU meter and range extending scale. (2) Channels and
shall be equipped with passive equalizer providing proper equalization for
a magnetic phonograph cartridge and representing RIAA equalization. The preampli-
fier shall measure 5'/~" high and shall weigh not more than 10% pounds. Power con-
sumption shall not exceed 20 watts. It shall be Altec Lansing 1567A.

A L -- 1442-1
PRINTED IN U.S.A.