pull its paired counterpart out of bias and cause it to “run away” as well. Regardless, flip the STANDBY to OFF.
Get an “OV-Glove” or similar method of hand protection (leather gloves, a rag, etc.) to grab the hot tube with!
Do NOT use your bare skin as the tubes will be very HOT!
Push up the spring steel Tube Clamp(s) and gently rock the faulty tube back and forth slightly while pulling it
down and out of its socket. Notice the orientation of the tube guide (raised bump) on the plastic piece in the
center of the tube’s base.
Gently and slowly and making sure the Tube Guide is aligned with the slot in the socket, install a new tube of
the same type and color rating (preferably matched MESA Tubes) as the one(s) removed if possible. Again,
make sure to line up the plastic guide bump with the slot in the tube socket’s center hole. Make sure the tube
is seated completely in the tube socket and that the tube filaments light up. If they are not lit up and glowing
orange, check the tube’s orientation and that it is seated firmly and completely into the socket.
Flip the POWER switch to ON and wait at least 30 seconds.
While watching the rear of the amplifier – and specifically the power tubes again – flip the STANDBY switch
to ON.
If you do not see any unusual flashes or brightly glowing (red hot) metal in the center of any of the tubes, you
have remedied the issues and are ready to enjoy your amplifier again.
If you see a flash or the center of the tube glowing bright red in the center of the metal inside the glass, repeat
the steps in this troubleshooting section again using another/dierent (hopefully known good) power tube(s)
of hopefully the same color rating.
POWER
This is the AC Mains Power Switch. The ON position supplies the AC voltage present at the wall socket – the
domestic rating = 117 Volts (120 V). Make sure the amplifier’s power cable (supplied) is firmly seated in its IEC
socket on the amplifier’s Rear Panel and that it is connected to a grounded power source that accepts the
standard 3-prong plug.
NOTE: Never alter or modify your power cable! Do not use Ground Lift Adapters (3 to 2 adapters)! Doing so will
void your warranty and put you at risk of electric shock.
Always begin playing sessions with the following Cold Start Procedure at Power Up:
1. With the STANDBY in the OFF position, Flip POWER to ON
2. Wait at LEAST 30 Seconds
3. Flip STANDBY to ON…and Enjoy!
Following this Cold Start Procedure will help ensure reliability and prolong the toneful life of your tubes, especially
the power tubes. Like an incandescent lightbulb that has a filament, much wear and stress on your tubes occurs
at the instant of power up from a cold state. Much like a dimmer on a light switch being set low when you first
flip it on, the STANDBY being OFF at the instant of power up – and for at least 30 seconds afterward – allows
the tubes to warm up and minimizes the shock on tube filaments when they are cold.
That’s about it for the Front Panel Modes, controls, and features. Hopefully, this information will prove valuable
as you explore to find your dream Tones. Now that you better understand your amplifier and what you can do
to shape the sounds you hear and need, let’s turn it around and go over the Rear Panel and its controls and
features.
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