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Kraken Range Navigation

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Alchemist Kraken APD8 Power Amplifier
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Alchemist Kraken APD8A MkII Power Amplifier
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Specifications | Images | Downloads | Design | Servicing | 2nd Hand Market

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S    P    E    C    I    F    I    C    A    T    I    O    N    S

(APD8 MkI)

Input Sensitivity:   950mV
Output @ 1kGz into 8 ohms:   >55Watts RMS (Typ. 60W)
Freq Response @ 3V o/p:   -3dB@100kHz
Distortion @ 15V o/p, 1kHz:   <1% THD
Distortion @ 15V o/p, 10kHz:   <1% THD
Residual Noise:   <1mV
Power Consumption (idle):   55 Watts
Power Consumption (peak power)   110 Watts
Dimensions (W x H x D):   320mm x 79mm x 245mm
Fuse rating::   2A @ 220/240V
4A @ 100/120V
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S    P    E    C    I    F    I    C    A    T    I    O    N    S

(APD8A MkII)

Input Sensitivity:   1V
Output @ 1kGz into 8 ohms:   >55Watts RMS (Typ. 60W)
Freq Response @ 3V o/p:   -3dB@100kHz (10Hz-64kHz)
Distortion @ 15V o/p, 1kHz:   <1% THD
Distortion @ 15V o/p, 10kHz:   <1% THD
Residual Noise:   <1mV
Power Consumption (Peak):   140 Watts
Dimensions (W x H x D):   320mm x 85mm x 250mm
Weight (Packed):   9.5kg
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Downloads:
Kraken mk1 brochure (6.13MB) | Kraken mk2 brochure (3.97MB) | APD7/8 review (What Hi*Fi?, Mar 93) (2.29MB) | Instructions
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Design:
Class A power amplifier with external power supply. The Kraken power could be used in standard or bridged mono, giving a claimed tripling in output power to 165 watts (8 ohms RMS) - don't forget this is Class A power and this amplifier runs hot. According to Alchemist's own specification, the amplifier's heat syncs reach 55 Centigrade in a 24 room, when the amp is idling.

The power supply was supplied with a single toroidal transformer, however a dealer-fit upgrade could be purchased which enabled a second transformer to be fitted into the spare space in the double-sized case (see photos above). This was a sonic rather than a power upgrade, driving each channel with its own transformer.

Differences between the Mk1 and Mk2 models included a redesigned case (the later offered an aluminium fascia and blue LED, whereas the Mk1 model had a Hammerite-style green livery with an orange LED). Sonically, the later model was a bit brighter, however both models had a characteristic early roll-off which gave them a wonderfully smooth & lush sound - not lacking in detail, but not overtly bright as some find many other amplifiers.

The Kraken Power Amplifier was designed to be used alongside the Alchemist Kraken Pre Amplifier or the Alchemist Kraken Integrated Amplifier.

Although not designed to be stacked (as stated these amplifiers ran hot), later models had a more considerately designed heat sync shape which enabled these components to be stacked symmetrically if desired.

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Servicing:
DO NOT ATTEMPT ANY WORK YOURSELF UNLESS YOU ARE COMFORTABLE WITH ELECTRONICS AND KNOW WHAT YOU ARE DOING

Popular tweaks seen on the Internet:

  • Improve the internal speaker wire
  • Change the eight x 3 watt 0R47 resistors (four on each channel) with Vishay non-inductive RCH25 types
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2nd Hand Market:
Highly sought after by owners of Alchemist Kraken Integrated amplifiers or with use with many other power amplifiers, this smooth-sounding class A power amplifier is considered to be rather special.
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