The Pultec EQP-1S is a vintage variation of the EQP-1A model, featuring the same passive-tube design but with a different frequency curve on both low and high-end of the spectrum. Nonetheless the EQP-1S delivers the same iconic same as its better known counterpart, the Pultec EQP-1A.

The Pultec EQP-1S varies from the better-known EQP-1A with different low-frequency curves, additional HF Boost frequencies and shelf boost modes. The Low frequency shelf curves feature different frequency points with a choice between 30Hz, 40Hz, 70Hz and 100Hz.  High frequencies are also modified featuring additional frequencies (1kHz, 2kHz, 3kHZ and 6kHz) as well as the inclusion of two-shelf boost at 5kHz and 10kHz.

Based on the modern reissue by Pultec:

  • 30, 40, 70, 100 CPS shelf boost, 0 - 13.5 dB
  • 30, 40, 70, 100 CPS shelf attenuate, 0 - 17.5 dB
  • 1, 2, 3, 4, 5, 6, 8, 10, 12 KCS peak boost, 0 - 18 dB;
  • 5, 10 KCS shelf boost, 0 - 14 dB
  • 5, 10, 20 KCS shelf attenuate, 0 - 16 dB
  • Input Impedance: ~600 Ohms
  • Output Impedance: ~50 Ohms
  • Noise: 92 dB below +10 dBm
  • Distortion: ≤ 0.15% at +10 dBm into 600 Ohms
  • Amplifier: Flat, 20 CPS to 20 KCS, +/- 0.5 dB
  • Tubes: 1 ea 12AU7, 12AX7, 6X4

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