The input transformer is built to exact Quad Eight factory specifications by the original manufacturer, from the original drawings. This allows you to use Professional 1970’s Audio Technology for it’s well known sonic characteristics in your present day recording system. And you save hundreds by assembling it yourself !

If you DO OWN a QE CA series line amp:  This kit contains all the parts (shown left) to assemble the preamp kit, QE lineamp conversion parts for your CA series card (including input transformer), templates for drilling the front panel, schematics and complete assembly instructions (This kit does not include the QE lineamp card).

If you DON’T OWN a QE CA series line amp, click here.

This web site will feature the latest products from the newly reformed company, Quad Eight Electronics LLC, who provides repair parts and repair and/or restoration services for original Quad Eight™ products, documentation and tips on restoring and revitalizing classic Quad Eight™ gear.

Information gathered from customer response and our user forums will shape future products. Please feel free to contribute at the Quad Eight Forum.

For current owners and users of classic Quad Eight™ , Electrodyne, Langevin, Sphere and Helios gear visit the Orphan Audio technical forums to share knowledge, tips and tricks, resources, fixes, mods, uses and general information as well as buy, sell and trade gear.

If you’d like to be a part of the family, email pics of your Quad Eight™ gear for the gallery (please confine your file size to under 300kb).  If you have any historical information on Quad Eight™  you’d like to share, please email or contact us.  We are still rebuilding the archive with incredible response from the audio community and an amazing collection of past QE engineering staff, but holes in the history remain to be filled.

Thanks for visiting.

Ken Hirsch, President
Quad Eight Electronics, LLC
& Orphan Audio, LLC

Santa Susana, California

The 333c Classic and 444 Classic are limited edition recording channel strips from the legendary Quad Eight Electronics.

Each 333c Classic channel strip features an original factory restored, 70’s limited production 3-band eq with many special features including precision stepped potentiometers, with 31 frequencies per band, and .8dB per step gain on each of 3 bands. 11 frequency selectable High and Low pass filter frequencies, +/-15dB overall gain trim and a signal presence led.

The 444 Classic channel strip EQ section includes an original factory restored, 70’s 4-band quasi-parametric eq with separate controls for gain, frequency and Q on each band, with peaking and shelving positions selectable on high and low bands. Two selectable frequencies are available for both High and Low pass filters.

Both Classic equalizers are paired with the QE MP-227, a world-class 70’s single stage preamp, renowned for its warm qualities on guitars, vocals and harmonically complex instruments. Transformer coupled, in and out, selectable input impedance for optimum matching to each microphone, Phantom, Phase, Pad switching, and gain control up to 56dB.

Each preamp and equalizer of the Classic series shares the well-known Quad Eight Class-AB high voltage discrete opamps, with their low noise, wide dynamic range, high headroom, and clip points approaching +30dBm.

These are limited editions: Only 50 units of each model will be built. Please reserve yours now.

To order your limited edition channels strips, please go to the Contact Us page and enter your request in the message window.

The 444 Classic is a limited edition recording channel strips from the legendary Quad Eight Electronics.

The 444 Classic channel strip EQ section includes an original factory restored, 70’s 4-band quasi-parametric eq with separate controls for gain, frequency and Q on each band, with peaking and shelving positions selectable on high and low bands. Two selectable frequencies are available for both High and Low pass filters.