TDL Technology
Las Cruces, NM 88012-9736
Dec 04, 2002 Model 407 Stereo Phono Preamp drives sound card's line-input for restoring 78 RPM records. Variety of response curves can be set with turnover frequency and rolloff frequency controls. Internal rechargeable batteries provide complete isolation from power mains and cast aluminum enclosure minimizes pickup of unwanted interference. Improved signal to noise ratio can be achieved by copying records in stereo, then combining channels after cleanup.

TDL Technology
Las Cruces, NM 88012-9736
Sep 30, 2002 Model 403 Stereo RIAA Phono Preamp drives sound card's line-input for restoring vinyl LP records which were recorded using RIAA equalization. Preamp uses low-noise opamps and features very low output noise and power line hum pickup. Internal rechargeable batteries provide complete isolation from power mains and cast aluminum enclosure minimizes pickup of unwanted interference.

PerkinElmer Inc. / Optoelectronics Unit
Montgomeryville, PA 18936
Apr 19, 2002 C30659-Series includes low noise Gasfet front end, avalanche photodiodes, and hybrid preamplifier in single modified 12-lead TO-8 package. Avalanche photodiodes can be either silicon or indium gallium arsenide and emitter follower is used as output buffer stage. It has strong response between 400 and 1700 nanometers. To obtain wideband characteristics, output of preamp should be ac coupled to 50-Ohm termination.

Amplifier Research Corp.
Souderton, PA 18964 2412
Apr 18, 2002 LN1G11 Low Noise preamp covers bandwidth of 1.0 to 11.0 GHz, has minimum gain of 27dB, and is suitable for amplifying low-level signals to drive power amplifiers. With its low noise, it can also be used to increase sensitivity of EMC receivers that have relatively high noise figures. It comes with benchtop cabinet and front or rear connectors. Other preamplifiers are available with frequencies that range from 10 kHz to 1.5 GHz.

TDL Technology
Las Cruces, NM 88012-9736
Jan 31, 2002 Model 401 high-performance microphone preamp's differential input stage uses compound transistor pairs with circuit resistance values, computer optimized for very low output noise. It drives computer sound cards' line-input, and is suitable in any application where very low noise gain is needed to condition low-impedance sensor output. Isolated from power mains, cast aluminum enclosure minimizes pickup of unwanted interference.