Exposure X specifications

Category : Integrated amplifier

Brand : Exposure

General

Connections

Technical data

Special equipment

The amplifier should have produced about 2000-3000 pieces, it is the first integrated amplifier from Exposure , designed by John Farlowe. The Exposure 10 is a typical English amplifier and has very conventional, discrete amplifier circuits, in his case with bipolar transistors. Particular attention was paid to the possible load- or frequency-response-independent voltage supply of the individual stages within the budget, moderately high negative feedback, a defined ground routing and the use of small components in the signal path that are as massless as possible (e.g. 10µF coupling capacitors). The sound can be described as very musical, in view of the low continuous power extremely (!) powerful and dynamic, this is more than comforting over the moderate noise voltage gap, due to the pre-stage voltage regulation. For operation, the manufacturer's own speaker cables (similar in construction or - the same as Naim , Linn K20, etc...) recommend. This makes sense in terms of circuitry, on the one hand, better control of the LS chassis is achieved due to the low cable capacitance, on the other hand, simple output stages without a coil (like this one) could oscillate and burn out at the low RF impedances of the cables.

Transistors used

Other models of the same series:

Interior view of an open Exposue 10

http://www.exposurehifi.com/products/classic/exp10.htm

  • Manufacturer: Exposure Electronics,
  • Model: X - "integrated regulated amplifier"
  • Years of construction: approx. 1987 - 1995
  • Type: Integrated amplifier
  • Remote control: No
  • Power consumption: Idle approx. 10-15 W, mainly due to the preamp supply, max. approx. 80 W
  • Dimensions: 85 x 430 x 310 mm (HxWxD)
  • Weight: approx. 9.0 kg
  • Color: Black
  • New price approx.: 2000 DM
  • Number of inputs: 5, RCA
    • Phono, optionally ex works as MM or MC, as a supplementary board
    • CD
    • Tuner
    • Video
    • Tape
  • Number of outputs: 2
    • Loudspeaker, 4mm jack
    • Tape-Out, RCA
    Phono, optionally available from the factory as MM or MC, as Board
  • CD
  • Tuner
  • Video
  • Tape
    Speaker, 4mm jack
  • Tape-Out, RCA
  • Continuous power:
    • 8 643961b8da111c0a15d770a1109a86d4: approx.35W
    • 4 643961b8da111c0a15d770a1109a86d4: approx.35-40W
  • Supply voltage
    • output stage +-32V regulated with zener diode circuit of +-37V power supply voltage
    • Pre-stage +-18V,individually regulated with 1x LM 317/337 ICs each for line and phono stage, derived from main power supply winding
  • attenuation factor:  ;?
  • Input (Sensitivity/impedance)
    • Phono(MM): 47 k643961b8da111c0a15d770a1109a86d4, 470 pF, 3.0mV
    • Phono(MC): 470 643961b8da111c0a15d770a1109a86d4, 6800 pF, 0.15mV
    • High Level Sources: 10 k643961b8da111c0a15d770a1109a86d4, 150 mV
  • Output Tape(Level/ Impedance): 600 ohms, 5V max. (passive)
  • Frequency response: 0.5 Hz - approx. 35,000 Hz
  • Tone control: not available
  • Balance control: not available
  • Loudness: not available
  • Subsonic: yes, permanently installed in phono stage (15 Hz, 6 dB/octave)
  • Mute: not available
  • Direct/Line- Straight: not necessary
  • Ripple voltage distance (short-circuited): ? (rather moderate)
  • Stereo channel separation: ?
  • Signal-to-noise ratio: ? (rather moderate)
  • 8 643961b8da111c0a15d770a1109a86d4: approx. 35W
  • 4 643961b8da111c0a15d770a1109a86d4: approx. 35-40W
  • Power amplifier +-32V regulated with Zener diode circuit of +-37V power supply voltage
  • preamp +-18V,individually regulated with 1x LM 317/337 ICs each for Line and phono stage, derived from main power supply winding
  • Phono(MM): 47 k643961b8da111c0a15d770a1109a86d4, 470 pF, 3.0mV
  • Phono(MC): 470 ohm, 6800 pF, 0.15mV
  • High level sources: 10 k643961b8da111c0a15d770a1109a86d4, 150 mV
  • Holden and Fisher 160VA-Transformer 2x37V sec.
  • Epoxy resin printed circuit board, double-sided traces, hand-soldered
  • ALPS RK27112 volume control (blue)
  • regulated output stage voltage via exposure-assembled power transistors, 1x for both channels
  • Exposure -assembled 10000µF main power supply capacitors
  • Usage of higher-quality c1f456ee3fc507d644eb50420511ad91 (BC) capacitors for all electrolytic capacitors
  • gold-plated RCA sockets in the phono input
  • floating ground in the preamplifier part
  • very low quiescent current of the power amplifiers, very large Class B range, low no-load power, nevertheless low distortion
  • very high-quality aluminum housing made of extruded profiles with very low construction tolerances
  • Tape Monitor
  • Phono, line stage:
    • ZTX214, ZTX384 high-noise type, construction-like/-equal to BC214/BC384
  • Power supply:
    • ZTX452,ZTX552, 100V;1.5A; hfe approx. 100, for drivers, replaceable by BC639/BC640 (less voltage-resistant, since only 80V!)
    • EXP8N, EXP8P, for power amplifiers, similar in design to MJ15003/MJ15004
  • Power amplifier:
    • BC414B hfe approx. 200 for power source differential input, high-noise type
    • BC414C hfe approx. 450 for differential input, high-noise type
      • < li>ZTX452,ZTX552, for voltage amplifiers, drivers, see above
    • EXP1N, EXP1P, for power amplifiers, similar in construction to MJ15003/MJ15004
  • ZTX214, ZTX384 high-noise type, similar in construction to/-equal to BC214/BC384
  • ZTX452,ZTX552, 100V; 1.5A;hfe approx. 100, for drivers, replaceable by BC639/BC640 (less voltage-resistant, as only 80V!)
  • EXP8N, EXP8P, for power amplifiers, similar in design to MJ15003/MJ15004
    BC414B hfe approx. 200 for current source differential input, high-noise type
  • BC414C hfe approx. 450 for differential input, high-noise type
  • ZTX452, ZTX552, for voltage amplifiers, drivers, see above
  • EXP1N, EXP1P, for power amplifiers, similar in design to MJ15003/MJ15004
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