Parametric Equalizer with Mastering option

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.

Product Features

• High cut at 6 frequencies: Slope 6 dB or 12 dB/octave
• Low 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

Audio files;

Specifications

• 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/230V, 50-60 Hz: 30-45