Ampeg svt 2 pro cl output tube life tech information
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Page 1
Technical Information Bulletin
SLM Electronics, Inc. Saint Louis, Missouri, USA
Corrective Action:
SVT-2PRO:
(1) Place the amplifier on the work surface, right side up, front panel facing you.
(2) Remove the 12 screws from the top cover. Remove the top cover and set it aside.
Proceed to step 7.
SVT-CL/SVT-AV:
(1) Place the amplifier on the work surface, on one
end, cabinet bottom facing you.
(2) Remove four of the five large bolts from the
bottom of the cabinet, leaving the upper bolt in
place. (Refer to the adjacent picture.)
(3) Lower the amplifier onto its feet on the work sur-
face. Position the amplifier so the end with the
remaining bolt hangs over the edge of the work sur-
face. (Refer to the adjacent picture.) Remove the
remaining bolt from the bottom of the cabinet.
(4) Reposition amp on work surface, right side up, front panel facing away from you.
(5) Remove the seven screws from the rear grille screen. Remove the screen and set it aside.
(6) Slowly and carefully work the amplifier assembly about 2/3 of the way out of the cabinet -“ far
enough to allow access to the tubes and the tube board. Avoid putting excessive strain on the con-
necting cables!
(7) Grasp one of the power tube retainers by its
top ring. Lift the retainer up and away from the
power tube, then slowly lower it to the plate at the
base of the tubes as shown in the adjacent pictures.
Repeat for the remaining tube retainers.
TIB0003SVT2PRO/SVTCL/SVTAV Power Tube Board Modification page 2 of 5
Page 2
Technical Information Bulletin
SLM Electronics, Inc. Saint Louis, Missouri, USA
CAUTION:The tension on the retainers springs
may cause them to snap back towards the base of
the tubes, possibly cracking their glass casings -
slowly lower each retainer down to the base of the
tubes to avoid such damage.
(8) Carefully remove each of the power tubes by gently rocking it side to side while lifting it straight
up. Set the tubes aside.
(9) Each tube retainer is secured to the tube socket with two 5/64 allen head screws. Remove the
screws, then remove the tube retainers and set them aside.
(10) Remove the eight screws from the tube plate. Remove the tube plate and set it aside.
(11) Lift the power tube circuit board assembly
up slightly and disconnect the white two-wire
connector from the two-pin header on the edge
of the board as shown in the adjacent picture.
(12) Lift the tube board assembly further up
until the ribbon connector beneath it is accessi-
ble. Disconnect the ribbon connector from the
multi-pin header on the circuit board beneath as
shown in the adjacent picture.
(13) Disconnect the remaining five wires from the underside of the tube board assembly. Place the
tube board assembly on the work surface so the printing reads right side up.
(14) Locate, cut and remove the six 1N4007
diodes (D1, D2, D3, D7, D8, D9) from the
tube board. (These are located in the high-
lighted areas of the adjacent picture.)
(15) Locate, desolder and remove the six 22
ohm resistors (R2, R4, R6, R7, R9, R11) from
the tube board. (These are also located in the
highlighted areas of the adjacent picture.)
TIB0003SVT2PRO/SVTCL/SVTAV Power Tube Board Modification page 3 of 5