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In such scenarios, the volume is usually louder, as is gain breakup. In the case of the Airspeed

amp, by rolling off the lows and mids, you avoid getting a tone that can wander and/or become

too "loose" for the tone and music (a solo typically) that you're playing.

Remember that this gain stage boost can only be accessed through the footswitch. Also,

remember that you can couple the boost gain with a MASTER 2 volume setting increase to reach

those searing solo tones.

Maintenance, Service and Adjustment

Tube Maintenance. Your new Airspeed amplifier comes equipped with the highest quality tubes

available, designed and tested for use in the demanding world of musical instrument amplification.

IT HAS ALREADY BEEN BIASED AT THE FACTORY. UNLESS YOU CHANGE TUBES, THERE'S NO NEED TO

BIAS IT AGAIN.

Please make note of the rating information on the base of the power tubes. You may find this

extremely useful if purchasing a spare set of power tubes (for backups), or when replacing power

tubes.

If you replace power tube sets with the same rating, no adjustment should be needed.

If you decide, however, to tweak the performance characteristics of your amplifier with a different

power tube set, you should have a qualified technician set the bias accordingly.

We highly recommend if you need service on your Airspeed amplifier that you take it to a qualified

guitar amplifier service repair technician. If you are a technician reading this manual, you'll notice

that on the back of the Airspeed FM-50 amp, there are several adjustment points that you can use to

"tune" the amplifier and bias the vacuum tubes.

Follow the steps below to bias your tubes:

P a g e

Airspeed FM-50 Owner's Manual, Ver 2.0

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