Description
Pulse Techniques Pultec EQM-1A3 (Used)
the 2U EQP-1A3 is a condensed version of the iconic 3U EQP-1A. The EQM-1A3 takes the EQP-1A/EQP-1A3 evolution one step further by replacing the BOOST/ATTEN potentiometers with 21-position (and BW with 11-position) ELMA switches, loaded with precision metal film resistors to achieve custom tapers for each control.
The current design implements our “full-range, progressive-taper” design, which provides 0.5 dB per step precision for the first 50% of rotation and then progressively larger (1 or 2 dB) steps as the control is rotated from 50% to 100% of rotation. This allows precise control for subtle equalization for mix bus or similar applications or the full 18-20 dB BOOST/ATTEN of the potted version when tracking or mixing of individual tracks. Furthermore, the stepped controls make recall a breeze and the precise tracking between units is essential for stereo image retention when using a pair on the stereo mix bus.
SPECIFICATIONS
20, 30, 60, 100 CPS (Hz) shelf boost, 0 – 13.5 dB (FRPT* stepped control, 0.5 dB steps 0-5 dB)
20, 30, 60, 100 CPS shelf attenuate, 0 – 17.5 dB (FRPT* stepped control, 0.5 dB steps 0-5 dB)
3, 4, 5, 8, 10, 12, 16 KCS (kHz) peak boost, 0 – 18 dB (FRPT* stepped control, 0.5 dB steps 0-5 dB)
5, 10, 20 KCS shelf attenuate, 0 – 16 dB (FRPT* stepped control, 0.5 dB steps 0-5 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
*Note 1: FRPT = full-range, progressive-taper. Step size increases when control is rotated beyond 50% rotation.
Note 2: The inherent interaction of Pultec controls affects the step size when both boost and attenuation are applied simultaneously.
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