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4.
Turn the amp's global MASTER volume all the way down (off).
5.
Ensure a proper load is connected to the Speaker Output and the impedance selector matches the load.
6.
Turn on the amp via the Power On.
7.
After a 60 second warm-up, flip the Standby (STBY) switch to ON.
8.
Check the mV reading on the DMM.
9.
For a 6L6GC loaded amp it should be between approximately 30 mAV, which is equivalent to 30 mA per tube. Amps
are setup at the factory at 30 mA per tube, however it is safe to run up to 40 mA per tube.
10. While watching the DMM, adjust the bias setting with the Bias control on the top right side of the chassis.
Counterclockwise rotation lowers the bias, whereas clockwise rotation increases it.
11. Take note of the Left Pair reading, then plug the red DMM probe into the Right Pair – Red Bias Test Point. Compare the
Right Pair reading with the Left Pair – they should be within ~5 mA of each other.
NOTE: If you see strange numbers, here are some possible reasons:
1.
If one side reads 0 mA and the other looks good – then likely both tubes on one side are out.
2.
If one side reads about half of the other side, then just one tube is out.
3.
If the two readings are close, just not within ~5 mA, then the tubes are not properly matched and should be replaced.
One can also swap one tube from each side in order to try and balance the readings more.
FM-50 Specifications
The Airspeed FM-50 Amplifier (Head unit)
50-Watt Class A/B Head
•
Two (2) 6L6GC power tubes, seven (7) 12AX7 pre-amp tubes (one tube used for the tremolo effect), one (1) 12AT7 tube
•
for reverb, one (1) 5U3B rectifier tube
MASTER volume 1 and MASTER volume 2 (MASTER volume 2 activation accessible through footswitch)
•
The CRUNCH circuit and tone of a vintage Marshall® amp
•
The CLEAN circuit and tone of a vintage Fender® Reverb amp
•
Treble, bass and mid controls for each channel
•
Tube reverb for luscious reverb tone faithful to Fender® Reverb amps. Tube reverb for the crunch side as well but
•
scaled back to recreate a typical late 90's Marshall® head
2 switched outputs (CLEAN and CRUNCH) and 2 non-switched, parallel outputs
•
Non-switched output for using one 2 x 12 Airspeed speaker cabinet (or alternatively, can be used with one or more 4 x
•
12 Airspeed speaker cabinets that have all the same speakers).
CLEAN output to an Airspeed 2 x 12 speaker cabinet or an Airspeed 4 x 12 switching cabinet.
•
CRUNCH output to an Airspeed 2 x 12 speaker cabinet or an Airspeed 4 x 12 switching cabinet
•
Effects loop SEND and RETURN
•
DELAY and TREMOLO effects as part of the effects loop circuit (which does not alter the tone of the channel)
•
PT2399 digital delay chip
•
Standby switch on front, power switch on back
•
Boost gain stage for CRUNCH channel (activation accessible through the footswitch)
•
Exotic wood accent panel
•
LED indicators to highlight activated features on both front panel and footswitch
•
Baltic Birch wood construction
•
The Airspeed Speaker Cabinet
Upward tilt of the speakers inside the cabinets (15 degrees for 2 x 12, 7.5 degrees for 4 x 12)
•
Wood accent panel
•
Caster quick-release plates pre-installed and caster wheels included
•
Recessed handles
•
Airspeed 4 x 12 speaker cabinet with Airspeed internal diagonal speaker switching capability
•
Baltic Birch wood construction
•
P a g e
Airspeed FM-50 Owner's Manual, Ver 1.4
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