Crane Song Insigna - 500 Series Tube 3-band EQ
Description
Insigna is a tube equalizer in a 500 Series package, using a dual triode circuit with a 12AX7 tube It has three bands and filters.
The EQ has 24 db/oct high pass and low pass filters each with seven frequencies. The top and bottom band are shelving each with eight frequencies. The mid band is peaking with eight frequencies.
The three bands work by using buffered RC circuits in the negative feedback path around the tube amplifiers. The result is a fat sounding EQ rich in second harmonic triode tube color.
Key Features:
• Discrete Class-A tube circuit
• Selected 12AX7 double triode
• "Negative Feedback Design" with buffered RC elements
• Three equalizer bands and low and high cut filters
• Transmission range: 1 Hz - 100 kHz
• Noise: -84 dBu, 20 Hz - 20 kHz
• Maximum input level: +24 dBu
• Maximum output level: +25 dBu
• Input Impedance: 32 kOhm
• Output Impedance: 160 Ohm
• Output transformer: Lundahl LL1585 (Mu metal shielded)
• Grayhill rotary switch
• Bourns Potentiometer
• Power consumption: 120 mA
• Automatically back-up fuse
• Construction: API Series 500 format