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Description
The OP-12 is a preamplifier and tone-shaper utilizing a discrete operational amplifier (opamp) design.ย At its heart is the TT10: a custom ten-transistor discrete opamp.ย It features a gain control which can be driven to saturate the transformer-coupled output, a variable high-pass filter (HPF), and an equalization (EQ) section with adjustable level and frequency settings.ย It is versatile, capable of output levels suitable for direct line-level recording into an audio interface or recorder, while also serving as an effective tone-shaping tool when integrated into an instrument-level pedal system.
Features
- Fully analog signal path
- Custom internal power supply raises voltages to +/-15V, allowing for high headroom suitable for line level signals
- Variable gain control ranging from +5 to +40dB
- Variable two-pole high pass filter ranging from 20Hz to 2.5kHz
- A semi-parametric mid-frequency equalizer with 12dB of boost or cut at frequencies ranging from 150Hz to 7kHz
- Transformer-coupled output
- Output level control following the transformer
- LED level meter
- Relay-controlled true bypass with a soft-touch footswitch
- Balanced bypass: passes balanced signals in bypass if balanced TRS cabling is used
- Rugged stainless steel enclosure
Specifications
- Power Supply: 9VDC center negative
- Current Draw: 175mA
- Input Impedance: 1Mฮฉ
- Output Impedance: <200ฮฉ
- Frequency Response: 30Hz-20kHz
- Gain: 40dB (approx.)