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Pultec EQH-2 Tube Program Equaliser

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Pultec EQH-2 Tube Program Equaliser front

The Pultec EQH-2 Tube EQ is a single channel tube equaliser with class A output stage. It has been designed as a compact version of the EQP-1 and features a more transparent character.

Originally introduced in 1956, the Pultec EQH-2 is a compact option to the 3U model EQP-1. The low-frequency boost/atten curves are identical to those of the EQP-1A and the high-frequency peak boost frequency centres are comparable to those of the EQP-1A. However, the shapes of the peak boost curves are slightly different, due to different choices of Ls and Cs. The Pultec EQH 2 has fixed bandwidth for the high-frequency peak boost and a fixed high-frequency attenuation frequency of 10 kHz. The line amp is the same minimalist class A output stage as used in the MEQ-5. Many engineers believe it provides a more transparent sound than the EQP-1A.

Main Features of the Pultec EQH-2 Equaliser:

  • Same Class A output stage as the popular MEQ-5 equalizer
  • Similar to the iconic EQP-1A equalizer but with a more transparent character
  • Fixed 12kHz Attenuation
  • Fixed HF bandwidth
  • 20, 30, 60, 100 CPS shelf boost, 0 - 13.5 dB
  • 20, 30, 60, 100 CPS shelf attenuate, 0 - 17.5 dB
  • 3, 5, 8, 10, 12 KCS peak boost, 0 - 18 dB;
  • 10 KCS shelf attenuate, 0 - 16 dB
  • Input Transformer: 600 Ohms
  • Output Transformer: 600 Ohms
  • Noise: Below -75 dBm
  • Distortion: ≤ 0.15% at +10 dBm into 600 Ohms
  • Amplifier: Flat, 20 CPS to 20 KCS, +0 / -1 dB, ref 1 KCS
  • Tubes: 1 ea 12AX7, 6AQ5, 6X4

Tech Spec of the Pultec EQH-2:

20, 30, 60, 100 CPS shelf boost, 0 - 13.5 dB

20, 30, 60, 100 CPS shelf attenuate, 0 - 17.5 dB

3, 5, 8, 10, 12 KCS peak boost, 0 - 18 dB;

10 KCS shelf attenuate, 0 - 16 dB

Input Transformer: 600 Ohms

Output Transformer: 600 Ohms

Noise: Below -75 dBm

Distortion: ≤ 0.15% at +10 dBm into 600 Ohms

Amplifier: Flat, 20 CPS to 20 KCS, +0 / -1 dB, ref 1 KCS

Tubes: 1 ea 12AX7, 6AQ5, 6X4