Aries Cerat is proudly announcing the completion of the Diana Series of amplification with the introduction of two new models. Along our Diana integrated amplifier, the Diana Forte, arguably the most powerful SET stereo amplifier in the World and the Diana Mezzo, its accompanying Class A pre-amplifier.
The two models share the majority of circuits with the Diana integrated and technically, is a two chassis improved version of the integrated. Customers have the benefit of purchasing the Diana Mezzo Pre-amplifier and later getting Diana Forte for a perfect match.
Diana Forte Stereo Power Amplifier
The Diana Forte’s circuits are based on the Diana Integrated amplifier output and driver stages. The Output stage is scaled up to deliver over twice the power achieving a true 60W (70W peak) of SET magic per channel. The parallel SET output stage is built around the 813 DHT big bottle tube. This in turn drives an oversized core OPT constructed using special winding techniques to deliver wide bandwidth at full power.
The amplifier driver stage is the one of the most linear tubes, the 814 DHT tube, loaded with a special quality double-C core bifilar winded inter-stage transformer. The Diana Forte’s amplifier is connected to its accompanying Diana Mezzo pre-amplifier via our proprietary AC link. As with the Diana Integrated and the Concero amplifiers, all stages are coupled with our special AC link method of coupling, delivering superior performance in the frequency extremes, transient response, and overload conditions.
The output stage PSU is a dual completely separate set of choke-filtered capacitor banks using our unique Super-capacitors. The SuperCaps come from a selection of special purpose film capacitors with ESL and ESR parameters 100 times lower than any film or electrolytic capacitor.
The high energy-high speed capacitor banks deliver a superbly robust power rail for the parallel SET output stage.
The driver stage also uses choke filtered capacitor banks, with their own separate power transformer to avoid PSU cross-talking.
All tubes can be biased and monitored on the fly as well as can be matched using the Diana Forte as a stripped-down tube tester.
All six filament PSUs are triple filtered, so that the all DHT power amplifier delivers the lowest noise floor of any SET power amplifier.
Max Power: 60W SE Class A (70W peak)
Max Power bandwidth: 15Hz- 110Khz
Noise floor: 100db
Combined gain: X 20 (26db)
Dimensions: 570mmW X 590mmD X 350mmH
Weight: 110Kg unpacked
Tubes: 2X814, 4 X 813
Diana Mezzo Pre-Amplifier
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.
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.
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
Tubes: 2 X 814, 2X 3b28