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Both preamp and power tubes are easily accessible on both Combo and Head versions of the TransAtlantic TA-30 through the removal
of a few standard Phillips head screws and removal of the Tube Access Panel (Combo) or top Hood (Head). This means that should
you ever need to replace a noisy or microphonic preamp tube or change out worn power tubes, you can do so in a matter of minutes
with the only tool required being a Phillips screwdriver.
NOTE: ! Warning ! Vacuum Tubes Get HOT During Use! It is always best to perform tube maintenance with the amplifier turned
off and the tubes allowed to cool before starting. If you must leave the amplifier on for trouble shooting or tonal comparisons during
tube swapping – Always flip the STANDBY switch to STANDBY BEFORE STARTING and use a rag or leather gloves to grab the hot
tubes. DO NOT GRAB THE HOT TUBES WITH BARE FINGERS – THEY CAN CAUSE SEVERE BURNS WHEN AT OPERATING
TEMPERATURE.
COMBO VERSION:
Preamp tubes sit horizontally on the tube sockets that are mounted to the component side of the circuit
board inside the chassis pan. To access them, remove the Tube Access Panel’s six Phillips head screws and carefully pry the vented
panel away from the recessed cut-out in the vinyl covered wood panel with either your fingernail or the tip of a flathead screwdriver
covered with a thin cloth (so as not to scratch either panel. After replacing tubes re-attach the Tube Access Panel and check that the
Phillips screws are securely tightened… but do not use excessive force and strip the Phillips head.
Power Tubes are located in the Tube Cage on the (bottom) Rear of the chassis and can be accessed by gently pulling the four plastic
stand-off clips away from the cage and carefully removing the cage. It is easier to replace the power tubes and line up the pins cor-
rectly when the amplifier is upside down and you can easily see the tube sockets. Alternatively you can put the amp up on a tall table
and get below the chassis and shine a light up into the back of the amplifier. We strongly recommend one of these two methods as
they will save your wrists, back and keep you from bending up the pins on tubes. Never force tubes into the socket. If the pins are
lined up you can easily insert them into their proper position. You can gently rock them back and forth into place once the pins are
aligned with no harm to the tube or the socket..
NOTE: ! Warning ! The risk for electrical shock exists when the Tube Access Panel is removed. It is always recommended to turn
the amplifier off and remove the A.C. Power Cord from the wall A.C. Outlet before removing the Tube Access Panel.
NOTE: ! Do not touch any circuitry components inside the chassis when replacing tubes. Never stick any metal objects inside the
amplifier chassis. Refer to a qualified Service Technician for all other service issues other than tube replacement.
TUBE ACCESS:
CAUTION!
WARNING!
HANDBUILT
IN PETALUMA
CALIFORNIA, USA
8 OHM OUTREVERB
4 OHM OUT 4 OHM OUT SEND RETURN EL-84 X 4TUBES: 12AX7 X 6 INSIDE
-
Unplug power to service chassis.
Unplug power to change fuse.
TA-30
MESA BOOGIE LTD.
ALL-TUBE AMPLIFIER
™
PATENTED
6,621,907
7,602,927
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