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.
TUBES & POTENTIOMETERS IN PULTEC EQUALIZERS
Tube Types ECC-82 and ECC-83 tubes are equivalent to the 12AU7 and 12AX7
respectively. The manufacture of these tube claim, and our experience confirms, that the
ECC series average substantially lower hum and microphonics than the 12AU7 and 12AX7.
The Low Boost control is Allen-Bradley Type JA-1031. This is a
10,000 ohm potentiometer with "Audio" or Logarithmic taper.
The Low attenuate control is Allen-Bradley Type JA-1041 or Ohmite
Type CA-1041. This Is a 100,000 ohm potentiometer with "Audio” or
Logarithmic taper.
The High boost control is Allen-Bradley Type JU-1031 or Ohmite
Type CU-1031 This is a 10,000 ohm potentiometer with "Linear"
taper
The High Attenuate control is a Allen-Bradley type JU-1021 or
Ohmite Type CU-1021. This is a 1000 ohm potentiometer with
“Linear” taper.
The Bandwidth control is a Allen-Bradley type JU-2521 or Ohmite
Type CU-2521. This is a 2500 ohm potentiometer with “Linear” taper.
The Low Boost control is a Allen-Bradley type JA-5031. This is a
50,000 ohm potentiometer with “Audio” or Logarithmic taper.
The Low Attenuate control is a Allen-Bradley type JA-2541 or Ohmite
Type CA-2541. This is a 250,000 ohm potentiometer with “Audio”
Logarithmic taper.
The High Boost control is a Allen-Bradley type JU-5031 or Ohmite
Type CU-5031. This is a 50,000 ohm potentiometer with “Linear”
taper.
The High Attenuate control is a Allen-Bradley type JU-5021 or
Ohmite Type CU-1021. This is a 5000 ohm potentiometer with
“Linear” taper.
The Low Peak control is a Allen-Bradley type JU-2521 or Ohmite
Type CU-2521. This is a 2500 ohm potentiometer with “Linear” taper.
The High Peak control is a Allen-Bradley type JU-1031 or Ohmite
Type CU-1031. This is a 10,000 ohm potentiometer with “Linear”
taper.
The Dip control is a Allen-Bradley type CB-2521. This is a 2500 ohm
potentiometer with counter clockwise Logarithmic taper.
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