500 Series User Guide
PRODUCT SUMMARY (583E, 583S): The LaChapell Audio 583 series modules feature single-ended vacuum tube preamplifiers designed for use in the “500 series” format. The microphone input configuration is based on the 992EG and consists of an input transformer with a turns ratio of 1:10 and one ECC83/12AX7 vacuum tube. The instrument input stage is transformer-less with the signal essentially going strait to the grid of the tube.
583E Controls: Input Gain Control Output Gain Control Phantom Power High Frequency EQ Band 20dB Input Pad Polarity Reverse Mid Frequency EQ Band Mic/Hi-Z Input Select Low Frequency EQ Band Hi-Z Input EQ Assignment Select (Auto Patching) Input Gain Control: Provides variable control over how much input source signal is driven onto the vacuum tube. Specifically, this control is positioned after the Jensen input transformer and just before the 12AX7 tube.
583S mk2 Controls: Output Gain Control 250V Indicator Phantom Power 20dB Input Pad Polarity Reverse Hi-Z Input Pull Handle Input Gain Control: Provides variable control over how much input source signal is driven onto the vacuum tube. Specifically, this control is positioned after the Jensen input transformer and just before the 12AX7 tube. Think of this control as your “throttle” for tube coloration/harmonics (distortion).
03 Controls: Trim Control Low Pass Filter High Frq. Sweep Control Mid Frq. Sweep Control Frequency Cut/Boost Controls Low Frq. Sweep Control High Pass Filter EQ In/Out High Frq. Sweep Control: Fully variable sweep range; 2.5kHz to 20kHz. Q value of 1 at +8dB Mid. Frq. Sweep Control: Fully variable sweep range; 325Hz to 5kHz. Q value of 1 at +8dB Low Frq. Sweep Control: Fully variable sweep range; 30Hz to 400kHz.
Specifications: EQ AMPLIFIER (583S & E): 583E 503 Internal Gain (microphone): 72dB Noise Floor: -90dB -90dB Internal Gain (Hi-Z): 52dB THD+N: 0.014% 0.014% Maximum Output: +26dBu (1% THD+N) Frequency Response: 10hz to 50Khz Frequency Response: 10hz to 50kHz (-3dB) Cut/Boost Range: +/- 8dB +/-12dB THD+N: Variable: 0.
Output Stage Diagram for 583S & E MODEL 583S Diagram -20dB Pad Control Microphone Input -20dB Pad Input Select Polarity Input Gain Tube Amp Balanced Output Output Gain Phantom Direct Input (Unbalanced) Polarity Control Phantom (+48v) Control MODEL 583E Diagram 4
Warranty: LaChapell Audio warrants that for a period of one year after the date of delivery, the Products delivered hereunder shall perform in accordance with the written product specifications current as of the date of shipment and under normal use shall be free from defects arising from selection of material or process of manufacture.
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