Tube-Tech EQ 1A Full Range Equalizer

Smooth tube equalization.

The Tube-Tech EQ 1A is a full range one channel unit, featuring low & high cut, low & high shelving and three overlapping bands. The cut filters are designed around unity gain amplifiers and the shelving and the bell filters are designed around two tube operational amplifiers.

The unit is all tube based except for the power supply. Input and output have fully floating transformers. All DC voltages are stabilized, except the anode voltage for the output stage.

Tube-Tech EQ 1A Full Range Equalizer Features:

Low cut at 6 frequencies: Slope 6 dB or 12 dB/octave
High cut at 6 frequencies: Slope 6 dB or 12 dB/octave
Band 1-3, bell type: 36 overlapping frequencies (12 per band), +/- 20 dB with variable bandwidth
Low shelving at 6 frequencies: +/- 15 dB
High shelving at 6 frequencies: +/- 15 dB
All switches gold plated
Conductive plastic potentiometers
Frequency response: 5 Hz to 60 kHz
Very low noise: < -85 dBU
Master bypass with click-less relay
All 7 sections fitted with separate in/out switch
Impedance Input: 600 ohm
Impedance Output: < 60 ohm
Frequency response @ -3 dB: 5 Hz to 80 kHz
Distortion THD+N @ 40 Hz: 0 dBu < 0.10 %; +10 dBu: < 0.10 %
Noise Rg=200 ohm: Unweighted < -85 dBu; CCIR-468-4 < -75 dBu
CMRR @ 10 kHz: < -60 dB
Max. output @ 1 % THD+N: > +26 dBu
Gain: 0 dB
Tubes: ECC 81 3 pc, ECC 82 2 pc, ECC 83 3 pc
Dimensions (H x W x D): 3.5" x 19.0" x 8.1" (88 mm x 483 mm x 205 mm)
Weight: 12.1 lbs (5.5 kg)
Power requirements @ 115 V/230 V, 50-60 Hz: 30-45 W