Stereo Pultec-Style EQ
Equalizer
From Manley Labs:
The Manley Stereo Pultec EQP-1A delivers dual-channel passive equalization based on the acclaimed Pultec topology, engineered specifically for stereo mixing and mastering applications. It does work equally well on 2 individual mono sources, like bass drum and vocals! Hand-built in California, this EQ combines passive inductor-based EQ networks with all-tube makeup gain amplification. That's how it provides the phase-coherent frequency shaping and harmonic character that define the Pultec sound.
The passive architecture of this EQ maintains phase relationships critical for stereo imaging while delivering musical frequency contouring across both channels. The passive EQ network ensures minimal phase shift, allowing broad tonal adjustments to the complete stereo field without compromising spatial information. From low-frequency reinforcement to high-frequency extension, the Stereo Pultec adds dimension, weight and clarity to mixes!
Manley's implementation expands upon the original design with additional frequency selections, extending tonal control beyond the classic Pultec architecture. All-tube makeup gain stages restore signal level with harmonic enhancement while the robust power supply ensures extended headroom and low noise performance. Conductive plastic potentiometers provide continuously variable control, with silent operation and long-term reliability throughout the signal path.
Specs
- Channels
- 2, Fully Differential All-Tube
- Input transformer
- MANLEY input transformer with nickel laminations potted in mu-metal case.
- Input impedance
- 3 kOhm input Z
- Hi-Z input
- Alternate transformerless 1/4" HI-Z (5K Ohm) input
- Vacuum tubes
- 2 x 12AX7 (gain) and 2 x 12BH7 (or 6414 or 5965) White Follower
- Outputs
- Hi-current drive <50 Ohm LO-Z XLR & 1/4" outputs; Balanced Transformer-Coupled XLR Outputs via MANLEY 9611
- Features
- PHASE REVERSE switch for balanced XLR input; BYPASS switch & AUTO-MUTE w/warmup delay; Silent conductive plastic BOOST & CUT controls; Sealed gold-contact Greyhill frequency select switches
- Frequency response
- Flat frequency response from 10Hz-70KHz
- THD
- <0.01% THD @ 1kHz
- S/N ratio
- 116 dB
- Adjustable feedback / gain
- Unity ±5 dB
- Max. output
- +30 dBv
- Power consumption
- 25 Watts
- Operating mains voltage
- Units are purpose built for original destination country's mains voltage: 100V, 120V, or 220-240VAC as indicated on the serial number badge. Power transformer must be replaced in order to change mains operating voltage. 120VAC units may NOT be rewired to put the primaries of the power transformer in series for 220-240V operation or a large radiated field of hum will develop. If changing locations/voltages, the power transformer must be replaced with the dedicated one for the voltage at which it will operate.
- Mains voltage frequency
- 50~ 60Hz
- Dimensions
- 19" x 3 1/2" x 10" (occupies 2u)
- Unit weight
- 12 lbs.
- Shipping weight
- 17 lbs.
Source: Manley Stereo Pultec-style EQ product page