Pultec EQP-1A User Manual

INSTALLATION AND OPERATING INSTRUCTIONS
PULTEC MODEL EQP-1A PROGRAM EQUALIZER
GENERAL
The PULTEC model EQP-1A program equalizer consists of a passive
equalizer, an amplifier and self contained power supply. The amplifier restores the
insertion loss of the equalizing network, thus providing a no loss, no gain unit.
INSTALLATION
INPUT IMPEDANCE: 600 ohms, matching, transformer input.
Can be strapped for 250 or 150 ohms.
OUTPUT IMPEDANCE: Transformer, feeds a 600 ohm load.
Can be strapped to feed loads of
300 or 150 ohms.
When installing in a unbalanced circuit,
strap one input terminal and one output
terminal to the chassis ground terminal.
AVERAGE INPUT LEVEL: optimum range-15dbm to +8dbm.
MAXIMUM PEAK OUTPUT LEVEL: +21 dbm.
POWER SUPPLY: 117 volts, 50/60 cps, 25 watts
Operation
The “LOW FREQUENCY” selector switch determines the curve on
which the left hand “BOOST” and “ATTEN” controls are effective. EITHER the boost
control OR the attenuate control should be operated as required. Do not attempt to
boost and attenuate simultaneously on the low frequencies.
The “HIGH FREQUENCY” selector switch determines the curve on
which the left hand “BOOST” control is effective. The “ATTEN SEL” switch selects
the curve on which the right hand “ATTEN” control operates. Consequently, it is
possible, and sometimes very desirable, to operate the right hand boost and
attenuate controls simultaneously. For example it may be desired to roll off on the
20kcs attenuate curve and also to brighten the signal somewhat at a lower frequency
by using the boost control.
The “BANDWIDTH” control adjusts the width of the high frequency
boost curves. This bandwidth control is continuously variable from sharp to broad.
Operating the key switch away from the “IN” position is equivalent to
returning ALL boost and attenuate controls to their zero positions. The amplifier
remains in the circuit.

Pultec EQP-1A Specifications

General

Output Impedance	600 Ohms
THD	< 0.1%
Power Requirements	115V/230V, 50/60Hz
Type	Passive Equalizer
Frequency Bands (Low)	20Hz, 30Hz, 60Hz, 100Hz
Input Impedance	600 Ohms
Tube	12AX7
Frequency Response	20Hz - 20kHz
Channels	2 (Stereo)
Frequency Bands (High)	3kHz
Attenuation (Low)	20
Attenuation (High)	20 kHz

Summary

EQP-1A Installation and Specifications

Input Impedance

600 ohms, matching, transformer input. Can be strapped for 250 or 150 ohms.

Output Impedance

Transformer, feeds a 600 ohm load. Can be strapped to feed loads of 300 or 150 ohms.

Unbalanced Circuit Wiring

Strap one input terminal and one output terminal to the chassis ground terminal.

EQP-1A Operation Guide

Low Frequency Controls

Selector switch determines curve for left hand "BOOST" and "ATTEN" controls. Boost or attenuate.

High Frequency Controls

Selector switch determines curve for left hand "BOOST". "ATTEN SEL" selects curve for right hand "ATTEN".

Bandwidth Control

Adjusts width of high frequency boost curves. Continuously variable.

Key Switch Function

EQP-1A Potentiometer Details

Low Boost Potentiometer (EQP-1A)

Low Attenuate Potentiometer (EQP-1A)

High Boost Potentiometer (EQP-1A)

High Attenuate Potentiometer (EQP-1A)

Bandwidth Potentiometer (EQP-1A)

EQH-2 Potentiometer Details

Low Boost Potentiometer (EQH-2)

Low Attenuate Potentiometer (EQH-2)

High Boost Potentiometer (EQH-2)

High Attenuate Potentiometer (EQH-2)

MEQ-5 Potentiometer Details

Low Peak Potentiometer (MEQ-5)

High Peak Potentiometer (MEQ-5)

Dip Potentiometer (MEQ-5)