Audio Upgrades High Speed Mic Pre Card

The Audio Upgrades Mic Pre Card offers high end outboard mic preamp performance in a low
cost miniature package designed to retrofit the mic preamps in mixing consoles. Unique
buffered current feedback amplifiers are used with a class A discrete front end offering
performance beyond outboard mic pre's. The small size means it can fit in the tightest packages.
Power requirements are plus and minus 9 to 18 volts with low current consumption making the
preamp ideal for battery powered applications. 48 volt blocking capacitors are fitted for easy
hookup. Onboard clamping diodes prevent input surges, and the 56 ohm output impedance
drives the most difficult loads, including headphones. With it's small size and low power drain,
the Audio Upgrades Mic Pre Card can fit almost anywhere, offering "high speed" sound at an
affordable price. Installation is easy, requiring only six connections. The preamp is ideal for
critical music recording as well as demanding film and post work.

FEATURES:
Gain is adjustable from 12 to 60 db.
Selected low noise Hitachi input transistors
Double sided unplated circuit board.
WIMA polypropylene and Panasonic electrolytic capacitors.
Precision Roederstein Resista 50 ppm metal film resistors.
High Speed Video Amp is socketed for future upgrades.
Size = 1.25 X 2".
SPECS:
Frequency Response 2 to 200k Hz.
Equivalent Input Noise = -129.5 db with 150 ohm input.
THD= .0005% typical.
IMD= .00015%
Slew Rate= 3000 volts per microsecond.
Common Mode Rejection= -80 db typical.
Phase Shift= Less than 10 degrees at 20k Hz.
Output current drive > 50 milliamps.

PRICE: $125.00

High Speed Microphone Preamp

The High Speed Microphone Preamp incorporates novel buffered current feedback amplifier
technology to create a microphone preamp with 4000 volts per microsecond slew rate. The fully
balanced two channel design has excellent transient response due to the ultra fast buffered
current feedback technology. Unlike transformer coupled designs, the High Speed Microphone
Preamp has no transformer coloration, and no slew limitations.
Controls include variable 15 to 60 db gain adjustment, selectable 48 volt phantom power,
individual peak overload indicators, and a rear panel voltage mains select switch. A high current
dual servo cross coupled output stage drives difficult loads and compensates for balanced and
unbalanced destinations.
The High Speed Microphone Preamp couples class A discrete RF transistors to ultra fast
buffered current feedback amplifiers. The balanced design offers excellent common mode
rejection, and self cancels distortion products. All circuitry is direct coupled and input blocking
capacitors are MIT and Infinicap film types. The power supply uses a low noise shielded toroidal
transformer and an AC line filter. No switches or connectors are used to preserve signal
integrity, and all solder connections are made with silver solder.

SPECS:
Frequency Response 2 to 200K, +0, -3db
Phase Shift less than 10 degrees
THD .0005%
IMD .00015%
EIN -132 db with 50 ohm load
Slew Rate 4000 volts per microsecond
Maximum output +28 dbu, >200 ma current

PRICE: $1500.00