Get the color and character of classic solid state preamp designs with
Seventh Circle Audio preamp kits. Improve your signal chain, save
money, and learn something while you're at it. All preamp kits
featu

* High quality double sided circuit boards, made in USA. Single board
design eases assembly and minimizes errors.
* Grayhill rotary switches for stepped gain control. 5 dB steps
provide precise, repeatable gain settings.
* Bourns conductive plastic pots for gain trim (full fader on the
N72). Allows "in between" gain settings.
* Gold plated toggle switches for phase and phantom power switching.
* Neutrik XLR connectors.
* Local voltage regulators for improved channel isolation,
reliability, and flexibility.

There are currently two power supplies and three preamp modules
available, with more on the way. All modules are designed to fit our
rugged 2U chassis, the CH01, and work with the PS02 power supply.

Preamps:

N72 - A modern recreation of the BA283 circuit used in the Neve 1272.
Two carefully implemented gain stages provide up to 70dB of gain with
better bandwidth than many racked "vintage" modules. $299.

J99 - A kit version of the famous Jensen Twin Servo preamp. Dual gain
stages yield high gain, wide bandwidth, very low distortion, and
extremely low noise. $299 (990c op-amps not included)

A12 - A full-featured single op-amp kit modelled on the API 312. Fully
compatible with the 2520 discrete op amp. Adjustable on-board voltage
regulators for easy swapping of op-amp modules. $259 (SC25 op-amp not
included)

Power Supplies:

PS01 - +27V, +48V supply for N72-only systems.
PS02 - +/-27V, +48V supply for mixed systems.

Chassis:

CH01 - Rugged, heavy gauge cold rolled steel chassis provides superior
durability and shielding from external magnetic fields. Heavy mu metal
power transformer shielding. 3/16" aluminum front panel. Black powder
coated chassis and beige panel, drilled and punched for 8 modules and
a power supply.

For more details and complete prices, have a look at our web site
http://www.seventhcircleaudio.com, and be sure to check out the
message board while you're there.