Rocktron Velocity VH 160 R - Manual (Page 13)

TUBE PREAMP
Replacing the Preamp Tube
We recommend that any work to be preformed on this amplifier be done by a qualified technician. Note
that any work not performed by a qualified technician may void the warranty of this product.
To replace the12ax7 preamp tube, follow these instuctions.
NOTE: Do NOT remove the silver plate on the front panel of the amplifier. This is NOT how you get to
the tube.
1) Turn OFF the amplifier
2) Remove power cord from the wall and amplifier.
3) Using a phillip’s screw driver, remove the screws on top of the amp
4) Carefully slide the entire metal chassis of the back of the amp. You will now have access to the tube.
CAUTION - the tube may be HOT! Allow enough time after using for the tube to “cool”.
Note, the speakers may also need to be disconnected to remove the metal chassis.
Reassemble the amplifier following the same steps in reverse.