KrellIllusionKrell Illusion Current top of the line preamplifier as newThis is the current top of the line two piece preamplifier in as new condition. We will ship this to you in your desired voltage. It is currently at its original 120v setting. Circuitry Highli...8999.00

Krell Illusion Current top of the line preamplifier as new [Expired]


no longer for sale

This is the current top of the line two piece  preamplifier in as new condition.  We will ship this to you in your desired voltage.  It is currently at its original 120v setting.

Circuitry Highlights
The Illusion preamplifier is a dual monaural circuit design with the left and right channels afforded their own power supply regulation and individual full chassis sized boards. All signal gain is realized in surface mount topology using proprietary multiple-output current mirrors with nearly 500 times the open loop linearity of other designs 1.5 MHz open loop bandwidth in a zero feedback, balanced, Krell Current Mode design terminating in Krell CAST. A complete Krell system (source, preamp, and amplifier) system, connected using CAST interconnects reduces the number of voltage gain stages to the minimum, one. The resulting noise floor approaches the theoretical limit of technology. Negative feedback is not used anywhere in the preamp, nor is it necessary. Open-loop distortion is typically less than 0.003%. The volume control is realized with a balanced resistor ladder — bandwidth and transient response of the preamp circuitry are virtually unaffected by the volume setting.

 

Power Supply Highlights
The Illusion audio circuits receive power from a Krell Current Mode analog power supply housed in its own dedicated chassis. The power supply avoids the common integrated circuit topology used in many preamplifiers and instead mimics the design topology of Krell Evolution e Series amplifiers. The circuitry is completely discrete giving it the ability to respond quickly to current demands and also be unaffected by all but the most severe AC voltage power fluctuations. Oversized for a preamplifier, the power supply features a 290 VA transformer and 41,600µF of capacitance. Locating the power supply in its own chassis presents the ideal configuration for isolating stray electrical and magnetic interference from the critical preamplifier signal path. Capable of delivering current and voltage swing for any musical event, the Illusion power supply is gentle on AC requirements when not in use. A new eco-friendly design reduces standby power draw to 2W.

 

 llusion Preamplifier

SpecificationsInputs
  • 2 pr. CAST via 4-pin bayonet connectors
  • 2 pr. balanced via XLR connectors
  • 3 pr. single-ended via RCA connectors

Tape input
  • 1 pr. single-ended via RCA connector

Main outputs
  • 2 pr. CAST via 4-pin bayonet connectors
  • 1 pr. balanced via XLR connector
  • 1 pr. single-ended via RCA connector


Subwoofer outputs
  • 1 pr. balanced via XLR connector
  • 1 pr. single-ended via RCA connector

Tape outputs
  • 1 pr. single-ended via RCA connector,buffered

Control inputs
  • 1 RS-232 input via a 9-pin D-subminiature connector
  • 1 remote IR detector input via a 3-conductor 3.5 mm connector
  • 1 12 VDC trigger input via 3.5 mm connector
  • 1 preamplifier link via an RJ-45 connector

ntrol outputs
  • 2 individually programmable 12 VDC trigger outputs via 3.5 mm connectors
  • 1 preamplifier link via an RJ-45 connector

Power output
    • 1 phone power output (±20 VDC) for KPE via a 9-pin D-subminiature connector

    Input impedance
    • CAST: 25 Ohms
    • Balanced: 40 k Ohms
    • Single-ended: 20 k Ohms

    Output impedance
    • CAST: >1 MΩ
    • Balanced: 250Ω
    • Single-ended: 125Ω

    Gain
    • 12 dB (CAST or balanced output)
    • 6 dB (single-ended output)

    Volume control
    • Balanced, current-mode, 16-bit, discrete R-2R ladder

    Input overload
    • Balanced, current-mode, 16-bit, discrete R-2R ladder

    Output overload
    • CAST: 16 rnA RMS
    • Balanced: 16 V RMS
    • Single-ended: 8 V RMS

Frequency response
  • 20 Hz to 20 kHz ± 0.02 dB
  • 0.35 Hz to 720 KHz +0, -3 dB
  • Single-ended: 8 V RMS

Total harmonic distortion plus noise
  • Balanced Output: <0.003%, 20 Hz to 20 kHz, 4 V RMS or 4mARMS

Signal-to-noise ratio
  • 4 V RMS balanced or 4 mA RMS CAST output
  • Wideband, unweighted: >100 dB
  • "N' weighted: >109 dB

Power consumption
  • Standby: 60 W
  • Power on: 65 W
  • Power on, with KPE: 75 W

Dimensions 
Preamplifier only:
  • 17.3 in.W x 3.8 in. H x 18.3 in. D
  • 43.8 cm W x 9.7 cm H x 46.4 cm D
Power supply only:
  • 17.3 in. W x 3.8 in. H x 17.7 in. D
  • 43.8 cm W x 9.7 cm H x 44.8 cm D
Preamplifier and power supply:
  • 17.3 in. W x 7.6 in. H x 18.3 in. D
  • 43.8 cm W x 19.2 cm H x 46.4 cm D

Weight
  • Shipped: 61 lbs., 27.6 kg
  • Preamplifier only: 18 lbs., 8.1 kg
  • Power supply only: 28 lbs., 12.7 kg


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