USER’S MANUAL
Electronaut M63 Vacuum Tube Microphone/Instrument Preamplifier
6
E L E C T R O N A U T C O M P A N Y
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INTRODUCTION
First of all, THANK YOU for adding the M63 Microphone and Instrument Amplifier to your recording system.
This preamplifier has been through close to a dozen incarnations since the orginal prototype was first built back
in 1999, and every version along the way improved upon some aspect of the previous one. A lot of obstacles have
been overcome and a lot of unexpected skills have been learned and mastered in order to produce this final design,
and I sincerely hope that you will enjoy the sound and performance of this preamplifier as much as I do, and for
many, many years to come. Thanks!
Rob Roy M. Campbell
ELECTRONAUT COMPANY
Initial inspection
The box and/or case includes three items: The M63 preamplifier, the User’s Manual, and the Line Cord. Check the
packaging to be sure you have everything.
Electronaut recommends that the M63 be inspected before use. To inspect the M63, remove the top cover and
make sure that all five tubes are properly seated in the tube sockets, to make sure nothing became loosened
during shipping. Check the four amplifier tubes and the rectifier tube.
This is a good time to get familiar with the inside of the M63. Using Figure 1 as a reference, locate the following:
• Meter calibration potentiometers – See page 11 for instructions on how to calibrate the VU meters to the
reference level of your choice.
• VU meter bulbs – See page 14 for instructions on replacing the VU meter bulbs.
• Pilot Lamp – There is no reason to pay any attention to the lamp socket since the bulb is accessed from the
front panel of the M63, but it might be worthwhile to take note of the type of base the pilot bulb has so that
you know what to expect when you remove and replace the bulb eventually. See page page 14 for instructions
on replacing the pilot lamp bulb.
• AC Mains Voltage Select Switch – See page 10 for instructions on configuring the AC MAINS voltage setting.
• Phantom Power Voltage Calibration Potentiometer
• Ground Lift Switches – See page 11 for instructions on configuring the various ground connection alternatives.
When the inspection is complete, 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.
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