ModWright Instruments LS 100, Руководство пользователя

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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.’ on rear panel.
Cartridge loading is achieved via internal dip-switches. Factory setting is 100 ohm, zero
capacitance.
Two 6-row dip switch banks are located on the board. Loading is as follows:

Dip Switch 1 up = 100 ohm; Dip Switch 2 up = 100 ohm.

Dip Switch 1 & 2 up = 50 ohm.

Dip Switch 3 up = 1K; Dip Switch 4 up = 1K.

Dip Switch 3 & 4 up = 500 ohm.

Dip Switch 5 up = 47K; Dip Switch 6 up = 100pf.
Total gain of phono and LS stages combined equals 70dB, adjustable via preamp volume control.