Manley Labs 16 X 2 Tube Mixer owner manual Back Panels

THE BACK PANELS

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1)MAINS ON / OFF SWITCH. "0" indicates OFF, "1" indicates ON. This should be set to OFF or O before plugging in any cables.

2)VOLTAGE LABEL (ON SERIAL STICKER). Just check that it indicates the same voltage as is normal in your country. It should be. If it says 120V and your country is 220V, then you should look inside the power supply and behind the Mains Switch is a "change-over switch" which has the numbers 110 and 220. Use an appropriate sized flat blade screwdriver to set it for the correct voltage for your area.

3)IEC MAINS SOCKET. In the box your mixer came in, is the IEC MAINS CABLE that should be wired correctly for your AC power. Connect the mating side here and the plug to your AC power at the wall. This is all pretty normal with most audio gear.

4)POWER CONNECTOR. The thick captive cable from the back of the mixer gets connected here. Rotate it to align it properly then the ring screws clockwise about a half turn to lock into place. This cable carries all the various power supply voltages to the mixer. Power should be OFF while connecting and disconnecting this big cable and should be OFF for about 5 minutes before disconnecting to allow the the power supply to discharge. It carries 350 volts DC for the tubes which can potentially arc pins and shorten their life or if touched by fingers give a nasty shock or burn but the current is low and non-lethal. The large pins carry 12 volts DC for tube filaments and for LEDs and Relays. These are higher current lines. Multiple redundant pins are used for other supplies for reliability and lower resistance.

One pair of pins carry 48 volts DC used for Phantom Power which will be on even if the power switch on the front panel of the mixer is off. It is also used for that same front panel power switch to turn on relays that turn on the other volts. In other words, there are two power transformers. There is a little one for the 48 volts which draws almost no power, and a rather big one for most of the mixer. The little one is used to remote control the big one and turn on the bulk of the power supply. It also means that the bulk of the power supply can't be turned on unless the mixer is attached via the Power Connector . This certainly makes connecting it safer but always have power switches turned off before connecting it and, again, let the supplies discharge for at least 5 minutes before disconnecting.

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