Smooth Valve Equalization
The TUBE-TECH EQ 1A is a full range one channel unit, featuring low and high cut, low and high shelving as well as three overlapping bands of equalization.
Product Description
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.

Optional Master Version available:
The EQ 1A Equalizer can be fitted with rotary switches instead of pots for even more precise settings. Please specify EQ1AM when ordering.
Key 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 clickless relay
  • All 7 sections fitted with separate in/out switch
  • Impedance
    Input: 600 ohm
    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 pcs
    ECC 82 1 pcs
    ECC 83 3 pcs
  • Dimensions
    Height:2 units 88 mm 3,5"
    Width: 483 mm 19,0"
    Depth: 205 mm 8,1"
  • Weight
    Net: 5,5 kg 12,1 lbs.
    Shipping: 6,9 kg 15,2 lbs.
  • Power requirements
    @ 115 V/230 V, 50-60 Hz: 30-45 W


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