Aries Cerat - Diana Mezzo

Aries Cerat - Diana Mezzo

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The Diana Mezzo is an improved version of the Diana Integrated’s pre amplifier stage. At its heart, the Diana Mezzo is a Single Ended Triode amplifier boasting an 814 Direct Heated thoriated tungsten DHT.  This 814 Pentode tube, which in triode mode, is more linear than a 300B tube.

The output transformer is a double-C amorphous core, bifilar winded OPT.

Signal attenuation is performed by a relay-switched array of resistors, in a shunt/ladder hybrid mode.

A pair of Xenon gas rectifiers are used as rectifiers of the High Voltage PSU.

These rectifiers were developed as drop in replacements for some well known mercury rectifiers when mercury was labeled unsafe. So while they present the technical characteristics of a mercury rectifier, they are safe to operate. The high speed capacitor banks are double choke filtered.

Filament PSUs are quadruple filtered using a cascade of choke/resistor-cap pi filters providing very low noise floor for the sensitive filaments of the DHTs.

Specifications

Gain: X7 (16db)

Attenuation level: 61 X 1db steps

Maximum signal input overload: 25V

Signal bandwidth @ 20Vrms: 10Hz-120Khz (-3db)

Dimensions: 500mmW X 350mmD X 340mmH

Weight:  55Kg

Tubes: 2 X 814, 2X 3b28

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