L.O.G.
Need "Lots of Gain"? Look no further!
The L.O.G is our second 500 series mic preamp offering, conceived for use in high gain applications. With up to 86 dB of gain, the L.O.G is ready to boost up input signals of all kinds, whether from a low output ribbon mic, passive DI, or a classic condenser. The input stage uses high precision transistors to amplify the incoming signal while minimizing noise. Users can then engage the HPF, get an optimal impedance match, or add an extra 20dB of low noise gain via the Turbo feature. Our output stage uses a MOSFET, subtly enhancing the signal with 2nd order harmonics for a smooth, pleasant saturation you can fine tune to taste. Finally, the signal passes through the air gapped output transformer, with front panel control to select between the two taps for different tone options. The fader control passively attenuates signals in preparation for the next step in your signal chain.
Features
Standard mic preamp functions; polarity reverse, -20 dB input pad, phantom power
Sealed gold contact Grayhill switch for stepped gain control
Up to 86 dB of gain, perfect for ribbon mics and passive DIs
Engage button to A/B HPF
Fully variable frequency control of HPF
Optimal source impedance matching via impedance switch
Optional +20dB of low noise gain using Turbo function
Air gapped transformer with tap control to choose the perfect tone for your signal
Output fader to manage level
Pre-fader LED signal level meter illuminates to show signal presence above -30 dBu and turns red 3 dB before clipping
Requires only one slot in a 500 series rack
Designed and hand built in Austin, TX using only thru-hole components
Price: $700, or $1300 for 2
To inquire, please contact audiotools@hammockhillstudio.com
Controls
Reverses the polarity of the input signal.
Attenuates input signal by 20 dB.
Phantom power button with LED indicator; illuminates red when phantom power is active.
Signal Indicator LED; Illuminates green to show signal presence above -30 dbu and red to warn of clipping at -3dbu.
12 position gain switch which boosts the incoming signal between 20 and 60 dB in increments of ~3dB.
Engages the 12dB/octave High Pass Filter (HPF).
Sets the frequency for the HPF, fully variable between 20 and 200 Hz.
Adds an additional 20dB of gain, perfect for driving a signal into distortion.
Impedance switch; toggles between 1200 and 6k.
Attenuates signal from unity gain to negative infinity.
Switches between primary and secondary windings in the output transformer for different tone options. The secondary has an additional 6 dB of gain.
Customization
We are pleased to offer customization options, including altering the slope of the HPF to 12dB/octave, adjusting the frequency range of the HPF, and changing the amount of fixed gain in the Turbo function.
Audio Samples
We had a great time recording some audio samples of the L.O.G with Mayfly at Orb Recording Studios. They played "In My Garden", which we recorded with L.O.G.'s across the full band. You can listen to the multitracks on this SoundCloud playlist, or download the Pro Tools session and complete set of multitracks here.
Tech Specs
Size: 5.25" x 7" x 1.5"
Weight: 1.07 lb
Frequency Response: 15Hz to 80kHz (±0.5dB)
Gain Range: 86dB (+0 to +86 dB)
Input Impedance:
Default: 1200 Ohms
Switch engaged: 6k Ohms
Output Impedance: 300 Ohms
Current draw:
Power Supply: +/- 16v (supplied by rack)
Clipping Level: +26 dBu
Noise: Measured at output, un-weighted, 150 ohm load across balanced input
Min Gain: -102 dBu
Max Gain: -71 dBu
Equivalent Input Noise: -131 dBu
Distortion + N: @ 1 kHz, +20 dBu output level, no load: .