Hagerman Cornet3 MM Vacuum Tube Phono Preamp

Excellent phono preamp hand built by Jim Hagerman. From Jim on the kickstarter campaign: "The Cornet3 is a radical evolution of the highly acclaimed circuit I  developed and introduced about
a dozen years ago. If you are seeking top-notch electronics to bring out the best in your
turntable and vinyl collection, look no further. For those of you with moving coil cartridges, I
am including the Piccolo2, a re-designed active head-amp with up to 26dB gain, built into a matching
enclosure...

...you would
have to spend well over $2000 to get the equivalent performance from anyone else in the industry.
That makes the Cornet3 and Piccolo2 incredible bargains."

The Cornet3 delivers high performance on a budget. The circuit
topology features common cathode class-A gain stages with no feedback,
passive equalization, and cathode follower output buffers with constant
current sink loading. Power is supplied by a regulated wall-wart driving
a boost converter (running at about 50kHz) to generate the high voltage
rail required for proper tube biasing.

Specifications

• 44dB gain (1kHz)


• 47k ohm input impedance


• 1k ohm output impedance


• +/-1dB RIAA accuracy (30Hz to 30kHz)


• 10Hz to 600kHz bandwidth (-3dB)


• 77dBA signal-to-noise (ref 5mV)


• 30dB overload (ref 5mV @1kHz)


• 5 x 7 x 1 inches


• 120V/240V operation 17W


• 12AX7 x 2, 12AU7 x 1