Manley Labs MM/MC GRAMOPHONE CARTRIDGE PREAMPLIFIER Operational Notes, Manley, Before Power-Up

OPERATIONAL NOTES

INPUT

GAIN dB

50

55

60

65

MM

M

C

1

M C 2

MANLEY

STEELHEAD

LOAD

	x100	CAP			x10
		pF
4	5	6		4	5	6
3		7	3			7
2		8	2			8
1		9	1			9
0		10		0		10

MC LOAD Z, ohms

0	100	2
		0
5		0
5		4
		0
2		0

						M	VOLUME
						UTE
							DI
							M
							S
							U
			LOAD				M
	x100		CAP		x10
			pF
4	5	6		4	5	6	LI
							N
3			7	3		7	E
2			8	2		8
1			9	1		9	SLEEP
0		10		0		10

PREPARATION FOR INSTALLATION

Budget a suitable space in which to place the preamplifier, power supply and associated interconnect cable. This space should be free of strong external magnetic and RF fields, and reasonably removed from strong loudspeaker-generated acoustical fields. This space should also be free of excessive heat or dust and large enough to permit easy flow of cool air to the top, bottom and sides of the preamp and power supply.

Make sure the power supply’s mains voltage selector switch is set to match the local line voltage, and the wire link is present between the preamp’s green CHASSIS and black CIRCUIT ground mini binding posts on the rear panel.

Try to position the power supply away from any interconnect cables which may be carrying audio signals.

BEFORE POWER-UP

Once placed, join the power supply cable to the pre-amplifier via the large16-pin circular connector. The 16-pin connectors are keyed and can only be mated when both halves are lined up correctly. Check and make sure the power supply is switched off, then attach the grounded IEC power cable jack to the IEC plug. Keep the power off until all other system connections are completed.

Proceed by connecting the input and output cabling to the signal sources and loads as desired. Tie any separate turntable or tonearm ground lead to the gold CHASSIS ground binding

Set the GAIN dB control to 55 dB and VOLUME control to about 9 o’clock. Choose the

MMor an MC input, as necessary, with the INPUT control. Place the LOAD Z switch to a value at or near that recommended by the cartridge manufacturer. Adjust the LOAD CAP switches to a value at or near that recommended by the cartridge manufacturer less any interconnect cable capacitance. Select and clean, if necessary, your favorite gramophone record....

Plug the power cable in and place the power supply’s mains power switch in the on () position. The STANDBY switch should glow. Push the STANDBY switch. The STANDBY switch will go dark, selected INPUT and GAIN blue LED’s will illuminate, the MUTE switch lamp will start flashing and the power supply pilot LED and the MANLEY STEELHEAD badge will light up.

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