Hagerman Audio Labs: Trumpet Vacuum Tube Moving Magnet Phonostage, Stereophile Class A

"Trumpet" Vacuum Tube MM Phonostage

$2699

The Trumpet is a state-of-the-art MM phonostage that uses balanced feedback-free differential triode gain stages and passive equalization. This topology offers incredible linearity and low distortion combined with unrestricted dynamics and clarity, delivering a hugely open and clear sound. The massive power supply is fully choke regulated for clean, impulse-free current draw from the ac line. The Trumpet has earned a Stereophile class "A" recommendation and industry acclaim. For MC capability, just add either a Piccolo headamp or a StepUp transformer.

Features

Two chassis design, separates power supply from sensitive circuits

Fully balanced differential circuits

Class-A operation, all tube signal path, no feedback

Choke input dc power supplies

DC heaters

Passive, split equalization

Polarity and mute switches

Specifications

Gain:	44dB
Input Impedance:	47k ohms
Output Impedance:	750 ohms
RIAA Response:	+/-0.5dB from 20Hz to 20kHz
Bandwidth:	5Hz to 250kHz
Distortion:	0.03% @ 1kHz
Noise:	75dB ref 5mV A-weighted
Overload:	250mV @ 1kHz
Size:	7" x 10" x 4" (each box)
Power:	120Vac, 90W
Tube Compliment:	12AX7 x 4, 12AU7 x 4

Downloads

User Manual (488k pdf)

Photo of Amplifier Guts (92k jpg)

Photo of Power Supply Guts (103k jpg)

Schematic (50k pdf)