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Genus 845

Tube integrated amplifier

Genus 845 elevation on black


The Genus SET integrated amplifier is the answer to the challenge of
making them smallest possible one-box integrated amplifier which would
carry our design philosophy. In development for some years we are proud
to announce the release of the ‘Offspring’ or ‘Genus’ to our
family of single ended amplifiers.

With a footprint of 520mm x 530mm it is our most compact design to date,
yet remains faithful to our no compromise approach. The Genus can fit
where it’s bigger brothers are unable to.








The Genus integrated is 25W in Class A1   yet only has two gain stages. It takes key design ideas from our Concero 25 monoblock circuit. It is effectively a small stereo SET amplifier driving a bigger stereo SET in one chassis.

The input / driver stage is a small 0.7W SE amplifier built around the Siemens E280F super triode and is loaded with a double c-core bifilar wound interstage transformer.

This single tube stage offers maximum linearity and bandwidth for maximum transparency. No coupling capacitors are present anywhere in the circuit.

The small SE amplifier uses our proprietary AC link coupling technology to link to the output stage. This technology uses the secondary winding of the first SE amplifier to modulate the biasing circuits of the bigger 813 tube output stage. AC link coupling technology is used in all of our bigger amplifier models.

All  four tubes have independent power supply units (PSUs) which are fed from dual 400V toroid transformers,800VA total. All four PSUs carry their own choke filtered capacitor bank.

The output stage power supply units again use our super capacitor technology. These top specification film capacitors have one to two orders of magnitude lower ESR and ESL than any electrolytic or film capacitor used in audio today, and have a maximum current surge specification exceeding 1000 amps.


The two 845 directly heated triode (DHT) tubes use triple passively filtered filament PSUs. All DHT tubes and especially the thoriated tungsten filament tubes, are extremely sensitive to noise present in their filament circuits. Our passively filtered system is fault proof and provides an extremely low noise floor with very high bandwidth and, as part our design philosophy, is without feedback.81

Bias of all four tubes,both the two the driver and two output tubes can be adjusted on the fly using the built-in bias meter, so you can tailor the sound to your taste,but also monitor tube's current long term.

A self resetting soft start is used to slowly build up the high voltages present and protect the tubes from any current surges at start up.




Volume and input selection is controlled with the amplifier's built in relay system and supplied remote control. We find this far exceeds the sound quality obtained by conventional potentiometers.

Inputs: 4 RCA pairs, 1 XLR pair (balanced). Outputs: Speaker and headphone out. Speaker output impedance is pre-configured on order from 1-16 ohms and comes with a two-position output impedance selector as standard. The headphone out is user switchable to high or low output impedance for maximum compatibility.


Bandwidth: 11Hz~60kHz Noise Floor: -100db unweighted

Output watts: 25W in Class A1,

Harmonic distortion: -64db H2 and -73db H3 @1W
Speaker impedance: User selectable from 1-16 ohms Weight: 67Kg unpacked
No local or global feedback  Tube compliment: 2 x 845 , 2 x E280F


 Genus 813 Limited Edition version



 The first iteration of the amplifier,using the 813 tubes,is available in limited numbers.






Diana Forte / Mezzo

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We proudly announce 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.


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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.


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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, ensuring this all DHT power amplifier delivers the lowest noise floor of any SET power amplifier.


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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.


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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.

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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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