Pultec EQM-1A3-SS Tube Mastering Equalizer
Description
The 2U EQM-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 and this solid-state line amp version of the EQM-1A3 has exactly the same front end (input transformer and passive EQ section) but utilize a solid-state opamp (API 2520) gain stage driving a Triad output transformer, just like the originals.
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
- 20, 30, 60, 100 CPS shelf attenuate, 0 – 17.5 dB
- 3, 4, 5, 8, 10, 12, 16 KCS (kHz) peak boost, 0 – 18 dB
- 5, 10, 20 kcs shelf attenuate, 0 – 16 dB
- Input Impedance: ~600 Ohms
- Output Impedance: ~50 Ohms
- Noise: Below -80 dBm
- Distortion: = 0.15% at 10 dBm into 600 Ohms
- Amplifier: 20 CPS to 20 KCS; +0, -1 dB ref 1 KCS including input/output xfmrs
- Output Level: +21 dBm maximum
- Amplifier: 20 CPS to 20 KCS; +0, -1 dB ref 1 KCS including input/output xfmrs
- Output Level: +21 dBm maximum