Alpha 8410 Linear Amplifier User Manual
RKR Designs LLC
Maintaining the Amplifier
DOCNUMBER 8410
Document Issue 1.1
Page 6–2
August 2015
66
6
WARNING
!
WARNING!
Do not allow any liquids to enter the cover’s tube-
exhaust holes.
Step 3
Disconnect the AC line cord from the power source and lift the cover.
WARNING
!
WARNING!
Disconnect the AC line cord from the power source
before lifting the cover for any reason.
Step 4
Clean the interior, particularly high-voltage areas, with a vacuum cleaner
and a soft bristle brush frequently enough to prevent visible accumulation
of dust. Optimally, remove the plate under the tube deck (attached with 4
screws) and use compressed air to blow out the cooling fins in the tubes.
Step 5
If conditions are extremely dusty, secure a thin air filter of the type used
for window air conditioners across the air intake on the rear panel.
Step 6
Replace the cover and reconnect the AC line cord to the power source.
6.2 Replace Tubes and/or Fuses
Perform this procedure only as needed.
Procedure 6-2
Replace tubes and/or fuses
Step 1
Power down the amplifier.
Step 2
Disconnect the AC line cord from the power source and lift the cover.
WARNING
!
WARNING!
Before lifting the cover for any reason, disconnect the
AC line cord from the power source.
Step 3
Replace tubes as needed. Ensure that cooling airflow to the tubes is
sufficient.
Use a matched pair of high-quality VTX-X120 tubes.
Step 4
Replace fuses as needed.
For 190–220-VAC service, use only 20-A, 250-V-rated fuses. For
90–130-VAC service, you may optionally use 25-A fuses with caution.
IMPORTANT:
Never replace a fuse with one of a different
type or greater current rating.
Damage resulting from
