Creek Evolution 50A

Integrated amplifier 2x55 Watt

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OPTION PHONO

This new amplifier forms part of the next generation EVOLUTION 50 range of products. Housed in a slim case with engraved front panel and solid HiFi Choice Awardcontrol knobs, it’s finished in either black or silver brushed aluminium. An ingenious new push button design has been developed for it, offering excellent tactile feel and backlit optical indication of usable functions for optimum user-friendliness. This is Creek’s first product to feature an OLED (Organic Light Emitting Diode) display. This white on black display provides higher clarity and resolution than a normal display. Brightness levels can be changed or the display made to turn off when not required, via the menu system. At the heart of any good amplifier lies a good power supply; The EVOLUTION 50A uses a 200 Watt toroidal mains transformer with separate windings for high and low current analogue and digital circuitry. This solution produces a good power to weight ratio and low magnetic interference. Creek’s policy of paralleling several low impedance capacitors to create an ultra-high specification capacitor to smooth the DC also helps to produce a very powerful and accurate sound from such a relatively small amplifier. Creek’s Senior Engineer – David Gamble – has much experience in the audio industry. He has developed a completely new bi-polar transistor power amplifier circuit especially for the EVOLUTION 50A with very high open-loop gain and low distortion. Featuring a pair of Sanken 15Amp power transistors, with built-in thermal compensation for rapid bias tracking performance, the Power Amplifier circuit has very low output impedance and can produce high output current. This combination will provide exceptional speed and control over most loudspeakers. David also developed a completely new analogue Pre-amp circuit, providing high levels of flexibility and control, via unbalanced or balanced inputs. It has multiple input options, switched electronically or via gold contact relays, plus electronic Volume, Balance and Tone controls. For Vinyl fans, a Sequel Phono pre-amp can be plugged-in, substituting Line Input 1 for Phono. In addition, there is another input available, should the user want to fit a Tuner module. The computer control will sense this and respond accordingly.

Specifications

- Power Output into 8 Ohms >55 Watts

- Power Output into 4 Ohms >85 Watts

- Max Current >26 Amps

- THD < 0.005% 20Hz – 20Khz

- Frequency Response 10Hz – 100KHz +/- 2dB (Unbalanced)

- Frequency Response 10Hz – 50KHz +/- 2dB (Balanced)

- Slew Rate > 30 V per µS

- Gain 33.3dB (x46) (Unbalanced)

- Gain 27.0dB (x22.5) (Balanced)

- Input Sensitivity 410mV

- Max Input Voltage 5.4V and 10.8V r.m.s.

- Separation -80dB

- SNR >102dB

- Output Impedance <0.1 Ohms @ 1Khz

- Outputs 1 Pair

- Headphone output Yes

- Speaker Selector No

- IR Input Powered output for IR repeater

- Operating Voltages 110V/230V Switchable

- Consumption (at idle) 20 Watts

- Consumption (at full power) 350 Watts

- Weight 7.5Kgs

- Dimensions 430x60x280mm W/H/D

OPTION Sequel mk3 MM/MC Phono Module

Creek Audio has always been a fan of the vinyl disc. For those consumers who have an interest in enjoying this alternative source of high quality music, there are few amplifiers available today equipped to deal with this as standard. All Creek integrated amplifiers, from 1993 have been designed to accept plug-in Phono modules, to enable vinyl disc reproduction. The latest Creek plug-in Phono pre-amp is called Sequel mk3. It is designed to match a wide-range of MM and MC cartridges and can be fitted to the latest integrated amps from Creek, namely the Evolution 50A, Evolution 100A. It can also be fitted to older Creek amps. Please read a definitive list below. The module must be fitted inside the amp, in a slot that will change the Auxiliary Line input into a Phono input, so either the supplying dealer, or the user, must fit the Phono pre-amp before it can be used. The new generation Sequel mk3 circuitry has been developed to simplify the user experience and provide flexibility to match various types of cartridge in one module. Not only can it be switched for 40dB or 50dB gain, the user can select 100pF or 200pF input capacitance and IEC low frequency roll-off, with a simple piano key switch on the PCB. The EVOLUTION amp’s display will automatically show Phono, when the amp is fitted with the Plug-in module and selected for that input. Exact matching of cartridge gain is not necessary, as the amplifier’s pre-amp volume control can always be used to increase or decrease the sensitivity. The main issue is to avoid input overload.

Specifications

- Input impedance: 47k Ohms

- Gain: 40 dB (x100) suitable for 2.5 to 5.0mV output range

- Gain: 50 dB (x316) suitable for 0.9 to 2.5mV output range

- Frequency response: 10 Hz to 20 kHz +/- 0.5 dB

- Optional low frequency: EQ: RIAA (flat) or IEC: 7950 µs (20 Hz roll-off)

- Input capacitance: 100pF or 200pF, optional

- Signal to Noise Ratio: 80 dB at 40dB or >70dB at 50dB gain

- Overload Margin: 15 dB, limited by pre-amp input overload

- Total Harmonic Distortion: <0.005%

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Creek Evolution 50A

Integrated amplifier 2x55 Watt