Replacing Vacuum Tubes
If it becomes necessary to replace the tubes, the same brand as installed new should be used.
A complete new tube kit is available from Navison audio Design. Although useful tube life varies
depending on the nature and degree of use, under normal home use, the 6C33C-B output tubes
should last many years in the NVS-003G. The 6SN7 driver and input tubes should last
even longer.
NOTE:
Any current production or New Old Stock (NOS) types of 6C33C-B, 6SN7GT tubes will
work fine in the NVS-003G amplifier. The voltages are fine for all available types.
WARNING!
Make sure the amplifier is unplugged 30 minutes from the AC mains before replacing the tubes
to avoid risk of shock and high heat from the 6C33C-B output.
WARNING!
Make no attempt to put the NVS-003G in service with the chassis open! Contact with the high
voltages found inside the chassis can be fatal! Remove the AC power plug from the wall and
allow 30 minutes for thehigh voltage capacitors to discharge through bleeder resistors
beforeattempting to change the tubes or to clean the inside the amplifier.
CAUTION:
Never remove or insert the AC plug when the unit is on or the AC power switch is in the
“ON” position.
Obstruction of the top portion of the amplifier will result in the tubes overheating.
NVS-003G Owner’s Manual
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