The TUBE-TECH EM 1A Equalizer contains a low frequency boost and attenuation section (shelving), and a high frequency boost section (peaking). The high frequency section has variable bandwidth as well as attenuation (shelving). The filter section is of the passive type followed by a tube based push-pull amplifier to restore the gain.
Input and output are balanced as well as fully floating. Input and output transformers come with a static screen between the primary and secondary wirings.
Tube based push-pull amplifier
4 low frequency boosts: 20, 30, 60 and 100 Hz (0 to +14 dB)
4 low frequency attenuations: 20, 30, 60 and 100 Hz (0 to -18 dB)
10 high frequency boosts with variable bandwidth: 1, 1.5, 2, 3, 4, 5, 8, 10, 12 and 16 kHz (0 to +18 dB with sharp bandwidth sharp, 0 to +10 dB with broad bandwidth)
3 high frequency attenuations: 5, 10 and 20 kHz (0 to -18 dB)
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