Raven Labs PHA-1
The PHA-1 is a professional unit that can be used as a headphone practice amp, versatile preamp, or to create your own mix in the studio. The PHA-1 will allow up to two players to plug in and practice together while monitoring their sound via the dual stereo headphone jacks.

Using the patch chord provided, a stereo source (such as a portable CD player or cassette) can be blended into the overall sound. The left and right mix volumes adjust the levels of the external source, providing the ultimate environment for silent rehearsing, solo or with a fellow musician. Make sure you are in key by hooking up a tuner to the Auxiliary send. The sound of your instrument can be tailored using the 3 band EQ.

Immediately noticable will be the sound quality, dynamic range and lack of annoying hiss. The PHA-1 will faithfully reproduce anything from a 5 string bass to the variety of sounds from a synthesizer.

Are you done practicing and ready for the gig? The PHA-1 makes the ideal buffer between your instrument and amp. The high input impedance assures that ALL of you instruments tonal characteristics reach your audience. As well, the PHA-1 will provide additional gain and tone adjustments. The Auxiliary send and Stereo mix inputs can now act as a side chain effects loop. Being on a "side chain" insures the integrity of the natural sound of your instrument, while lowering the overall noise created by your effects unit. Use the Line Out to send the signal to your amplifier.

The PHA-1 is powered by a pair of 9 volt batteries. Battery installation is easy using the battery compartment on the outside of the chassis. No "unassembly" is required. Battery life will be around 50 hours.

Each unit comes with a 3 year guarantee against parts and workmanship.
Front Panel Features
High Gain Input
Low Gain Input
Volume Control
Bass EQ Control
Midrange EQ Control
Treble EQ Control
Stereo Left and Right Mix controls
On/Off Power Switch
Rear Panel Features
Two Stereo Headphone Outputs
Mono Line Out jack
Auxiliary Send Output
Stereo/Mono Mix input jack
Stereo/Mono Mix In selector switch
Dual 9 volt battery holder
A/C Adaptor (Optional - not pictured)
Specifications
*All measurements taken with fresh 9 volt batteries.

Power source: Dual 9 volt batteries. Over 50 hours life expectancy under normal use.

Frequency Response: -3dB from 30Hz to 60KHz

Distortion:
Preamp/Line Out: 0.008% @ 1KHz, +4dB
Headphone Amp: 0.06% @ 1KHz, +4dB @ 75 Ohms

Noise: -85dB typical (Tone Controls in "flat" position)

Maximum Gain: 7.5X (17.5dB)

Maximum Input Level: 2 volts RMS

Input Impedance:
Hi & Lo Inputs: 3.9 Meg ohms
Left and Right Mix In inputs: 20K ohms minimum

Maximum Output:
Preamp/Line Out only: 3.2 volts RMS
Headphone Out, 75 Ohms Impedance: 2.2 volts RMS (65 milliwatts)

Output Impedance: Line Out, Auxiliary Send: 100 ohms

Hi and Lo Inputs Gain Difference: The Low input has 3.5dB less gain.

Resistors: 1%, 1/4 watt. Capacitors: Mylar (German Wima)

Chassis: Steel, powder coated.

Dimensions: 6.7" W x 1.75"H x 6"D

Weight: 2 lbs., 3 oz.
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