USER’S MANUAL
Electronaut M63 Vacuum Tube Microphone/Instrument Preamplifier
12
E L E C T R O N A U T C O M P A N Y
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ever, in the event that you experience a ground loop in your system, you can try the various connection
alternatives to see if they help to eliminate the problem. To make an adjustment to the Ground Lift switches,
follow the procedure below:
1) Turn off the M63, unplug the AC mains cable, and wait about five minutes.
2) Remove the top cover and set it aside.
3) Slide the #1 switch to the ON position.
4) Put the cover back on. Do not tighten the top cover screws with a screwdriver until all the screws have been
inserted and lightly tightened by hand. Do not over-tighten the screws.
5) Plug the M63 back in and turn it on. See if it helps. If not, repeat the above instructions and try a different
setting. It is safe to try any combination of settings.
The M63 is shipped with #1 and #2 switches in the OFF position.
Incase you’re wondering what the various connection alternatives provide, here’s the deal:
Switch 1: In the ON position, pin 1 of the output XLR is connected to the ground plane of the amplifier’s circuit
board. In the OFF position, pin 1 of the output XLR is lifted.
Switch 2: In the ON position, the ground plane of the amplifier’s circuit board is connected to the ground plane of
the power supply circuit board. In the OFF position, the ground plane of the amplifier’s circuit board is connected
solely to the chassis through the input XLR.
OPERATION
Powering up the M63
Once the M63 has been inspected, installed, and properly set-up, power the unit on by lifting the POWER toggle
switch to the ON position. Turn on the phantom power switch if necessary, and allow at least thirty seconds be-
fore attempting to pass audio. Since vacuum tubes will sometimes make audible noises while they’re coming up
to operating temperature, it is a good idea to let the M63 warm up for fifteen to twenty minutes before recording
any critical performances.
Setting the GAIN
Set the INPUT MODE switch to the 0 dB setting.
Connect a microphone or instrument using a good quality cable that is known to be free from defects. NOTE:
If you connect a condenser microphone to the M63 using a shorted microphone cable and apply phantom
power, there is a good chance you will damage the input transformer! Make sure your microphone cables are good
quality and free from defects.
The normal procedure for setting the GAIN is to start by turning the TRIM control fully counterclockwise, and the
ATTENUATE control fully clockwise. Then, slowly bring up the TRIM control until the desired level is set. If the
level coming from the microphone is very loud, it may be necessary to switch in the 20 dB PAD to prevent clip-
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