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ModWright Instruments LS 100 Owner's Manual

Ls 100 tube preamplifier
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LS 100 Tube Preamplifier
Owner's Manual
Manufactured by ModWright Instruments, Inc.
21919 399th St., Amboy, WA 98601
USA
www.modwright.com
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Summary of Contents for ModWright Instruments LS 100

  • Page 1 LS 100 Tube Preamplifier Owner’s Manual Manufactured by ModWright Instruments, Inc. 21919 399th St., Amboy, WA 98601 www.modwright.com...
  • Page 2 CAUTIONS: When removing the lid screws ONLY remove the screws on the side panels and the screws on the top panel at the front and rear edge. The screws in the middle of the top cover are attached to nuts below and do not secure the lid in place.
  • Page 3 Setup: It is always recommended to remove all tubes before shipping the unit. Be sure that the LS 100 is NOT connected to AC power and that power plug is disconnected from unit and wall outlet. Use supplied 5/64” hex driver to remove lid screws on sides and along front and rear edges of top panel and install (2) 6SN7 signal tubes and (1) 5AR4/GZ34 rectifier tube in ceramic octal sockets.
  • Page 4 The LS 100 also includes a number of features not found on simpler linestage-only designs:  Remote power.  Balance control (may be bypassed via remote or front panel controls).

  • Page 5: Operation

    Power button and headphone jack are located on opposite ends of the faceplate. LS 100 has five sets of standard inputs, located on the back panel: Opt. (Optional Upgrade input), CD, DVD, VIDEO, AUX. 1 and AUX. 2. AUX. 2 features XLR inputs, wired single-ended.

  • Page 6: Input Selection

    When used in this mode, home theater preamp or processor is connected to HT/BP inputs and signal is output straight to 2CH main stereo outs. This allows direct connection to front L/R channel amp(s) with no sonic impact from LS 100 preamp. Input Selection: Inputs may be selected via front panel or remote control.

  • Page 7: Technical Specifications

    Technical Specifications:  Tube Complement: (2) 6SN7 signal tubes, (1) 5AR4/GZ34 rectifier tube.  Gain: ~12dB.  Input Impedance: 38Kohm.  Output Impedance: 300ohm.  Frequency Response: 20Hz – 100Khz (-1dB)  Weight: 29 lbs. (34 lb. packed)  Dimensions: 17”W x 17”D x 5-1/2”H. Basic Specifications: ...
  • Page 8 Optional Phono Upgrade: If the phono board is already installed in your LS 100 when you receive it, then you only need install the tubes. Per diagram below, install 12AU7/ECC82 and 12AX7/ECC83. Turntable ground lead should be connected to brass grounding nut on back of LS 100. Phono input leads from turntable connect to RCA inputs labeled ‘Opt.’...

  • Page 9: Upgrade Installation

    Lastly, install the Left (Black washers) and Right (Red Washers) RCA’s in the back panel of the unit. Washers should isolate RCA body from metal enclosure. At this point, please refer to previous page for location of tubes and tube loading options. Thank you and enjoy the ModWright Phono upgrade for the LS 100.

  • Page 10: Warranty

    Warranty: ModWright agrees to warranty product for a period of 5 years from the date of purchase from a factory authorized ModWright Instruments Dealer. Warranty covers parts and labor for repairs due to equipment failure not related to customer abuse and/or neglect. Customer is responsible for shipping costs to and from ModWright Instruments or authorized service center.

  • Page 11: Contact Information

    Contact Information: If you have any questions about ModWright Instruments products or ModWright modifications or products, please do not hesitate to contact us via phone, e-mail or conventional mail. PH: 360-247-6688 EMAIL: modwright@yahoo.com ADDRESS: ModWright Instruments, Inc. 21919 NE 399...

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