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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