Diablo - RIAA

NCPSU (Never Connected PSU) avanceret ekstern strømforsyning, der virker som om elnettet er frakoblet (eller kører på batteri)

The Diablo is a high performance, audiophile grade phono amplifier, designed for ultimate transparency and realism. It will maximise the performance of a wide range of phono cartridges from ultra-low output Moving Coils to high output Moving Magnets.

As with the Dino, the Diablo will accept a wide variety of MM and MC cartridges with adjustments for amplifier gain and cartridge loading on the underside of the unit.

Four high speed low noise voltage regulators effectively turn this into a dual mono design in one box.

The prime power supply for this unit is the ‘Never Connected’ PSU. It is however available with in in-line toroidal supply as a starting option.

The Diablo is user adjustable with a set of four DIP switches on the underside of the unit. These switches allow for adjustment of cartridge loading and gain setting.

The circuit is signal non-inverting and constructed using high performance, audio grade bipolar and JFET operational amplifiers from Analog Devices and Linear Technology. Metal oxide resistors and ultra low impedance capacitors throughout for lowest possible noise.

The RIAA equalisation network is part passive and part active. The capacitors and resistors used in this stage are very close tolerance audiophile types.

Four ‘state of the art’ ultra low impedance, low noise wide-band voltage regulator circuits are employed to power both channels and are largely responsible for the high sonic performance of the Diablo.

The non-ferrous cabinetry is made of aluminium, a design that reduces eddy current propagation that can affect sound reproduction in subtle but deleterious ways.

Two versions of power supply are available for the Diablo, the basic toroidal transformer power supply and the fully blown ‘Never Connected’ PSU.

Never Connected PSU

This unique power supply technology is now available for use with a wide variety of equipment. It is a stand alone power supply intended to upgrade the sonic performance of the audio component to which it is connected.

The power supply circuits in the majority of audio equipment tend to be based on the usual transformer, bridge rectifier, storage capacitor, voltage regulator topology. The electronic components used are generally of standard quality and provide adequate performance for the majority of people. Each of these components can be upgraded to ‘audiophile’ quality to gain significant improvement in sonic performance, but no matter how good the upgrade there will still be the influence of mains pollution percolating through and spoiling the end result. This is the reason that ‘Never Connected’ technology was developed. By isolating the voltage regulation circuits during the conduction cycle of the bridge rectifier, most if not all of the effects of mains pollution can be eliminated. The end result is a vast step forward in sound quality.

The box contains a printed circuit board with one toroidal mains transformer and two ‘Never Connected’ circuits, one positive voltage and the other a negative voltage. Each of the ‘Never Connected’ circuits is followed by a High Performance Voltage Regulator circuit (super regulators if you prefer) to provide a stable, low noise, wide bandwidth output voltage.

Specifikation:

Diablo Technical Info
Specifications for the Diablo Phono Stage
Stereo phono amplifier for Moving coil and Moving magnet cartridges. Part active, part passive RIAA equalisation.

Switch Selectable Cartridge Resistance Loading (DIP 1 and 2)
33 ohms       For Moving Coil cartridges
100 ohms       For Moving Coil cartridges
1,000 ohms       For Moving Coil cartridges
47,000 ohms       For Moving Magnet and some Moving Coil cartridges

Switch Selectable Capacitance Loading (DIP 1 and 2)
100pF       For Moving Magnet and Moving Coil cartridges
1,000pF       For Moving Coil cartridges

Please refer to your cartridge specification for correct loading settings.

Switch Selectable Gain (DIP 3 and 4)
Cartridge Type       Sensitivity
MC Very Low:       100uV to 250uV (74dB)
MC Low:                250 to 400uV (70dB)
MC Normal:           400uV to 1mV (63dB)
MC High/MM Low:   1 to 3mV (52dB)
MM High:               3 to 5mV (48dB)

RIAA Reproduction Characteristics
20Hz to 20,000Hz      +/-0.25dB

Output voltage: 0.5V at 1KHz

Power Supply Requirements
The Diablo can be powered from either an AC or a DC power supply.

AC requirements: two independent supplies of:         0v / 18v ac,        0v / 18v ac.
DC requirements: two independent supplies of:         0v /-22vdc ,      0v / +22vdc

To avoid problems only use Trichord power supplies.

Dimensions and Weight
Overall case dimensions for Diablo:   185mm x 58mm x 112mm (D x H x W)
NCPSU:   185mm x 58mm x 112mm (D x H x W)
Standard AC PSU:   85mm x 50mm x 85mm (D x H x W)