Diana Tube Integrated Amplifier


Dias1Our long-awaited integrated amplifier,the Diana, is ready to give unsurpassed sonic bliss in a single-though-hefty package.

Using borrowed techniques and circuits from our top-line Monoblocks like the Concero 65,and pre-amp stages like the Pondera Ref,we have come up with what we believe, is the absolute and superlative design in integrated amplifier world.

The Diana is a three stage ,all Direct Heated Triode Single Ended amplifier.All stages are coupled using interstage transformers.

All three stages are designed as Direct Heated Single Ended amplifier stages. The first two stages are loaded with highest quality bifilar-winded, interstage transformers, no coupling capacitors present in signal path.

Input tubes are a pair of high power DHT 814 tubes, driving another 814 pair, which drives a pair of 813 DHT output tubes.

The power supplies are fed by a 800VA and a 1000VA (1800VA total) transformers, controlled by a soft start circuit. The four 814 and two 813 tubes, all have their separate choke filtered PSUs and all 6 filaments are powered by 6 tripled filtered PSUs, to provide solid power reserves, and perfect isolation between all stages.

Output stage power supply ,uses three film SuperCapacitors(3kg each,100 times less ESL/ESR than any Electrolytic technology).

Biasing of the input, driver and output tubes is attained via special biasing circuits, and all stages can be fully adjusted and monitored while listening.

Attenuation method is discrete-relay-switched-resistors.






    Number of inputs: 5 unbalanced, optional

    Balanced input

    HT pass-through ready

    Gain: 24db

    Power Output 25W sine, 50W square

    Signal bandwidth :6Hz-100KHz

    SNR >110db

    Weight: 115kg

    Dimensions: 570mmW X 630mmD X 360mmH



    As an output tube, we use the RCA 813 DHP, also used on our top Reference model, the Exsequor. This transmitter tube, maybe is, the most linear power tube ever built. Triode curves quality are unmatched even by the most linear 300B tubes, of course bigger triodes like the 833 are far behind in linearity and sound. This big bottle tube never seizes to impress us whenever we compare it in our labs with ANY power tube used today, and is our weapon of choice when designing SOTA SET amplifiers

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