Audio Note Vindicator - Manual (Page 7)

The amplifier is shipped without its valve compliment installed. It is necessary to
install the valves before operation.
It is essential that the valves are installed correctly or serious damage that is not
covered by the warranty will result. We recommend that your dealer perform
this procedure for you if you are in any way unsure.
FIRSTLY, ENSURE THAT THE AMPLIFIER IS NOT CONNECTED TO A MAINS
ELECTRICAL SUPPLY, AND THAT THE POWER CORD IS NOT CONNECTED TO
THE AMPLIFIER.
Now remove the valves that are packed inside the amplifier and carefully unwrap
them. Also inspect the amplifier to check that nothing has become damaged or
dislodged during transit.
2 x 2A3 output valves
1 x 6SL7GT input stage valve
1 x 5R4GY rectifier valve
Once again, please understand that it is absolutely vital these valves are fitted
correctly.
Looking from the front of the amplifier install the 2A3 valves first. Inspect a 2A3 valve
base and you will notice that two of the pins are larger than the other two; this is to
help ensure that the valve can only be inserted one way.
Now examine the two large apertures located in the top plate of the amplifier,
between the single front valve base aperture and the large, black, square transformer
cover; you will notice that two of the four holes in each aperture are larger than the
others. Line up the large pins on the base of the 2A3 valves and the large holes in
each valve base, and with gentle but firm pressure insert the valve into its socket.
Next, examine the single 6SL7GT input stage valve. You will see that there is a rib on
the central pin of the valve, which ensures that it can only be inserted into the valve
base correctly. Locate this rib and align with the corresponding aperture in the centre
of the valve base, located in the top plate at the front / centre of the amplifier. With
gentle but firm pressure, insert the valve.
Next, examine the remaining 5R4GY rectifier valve. You will see that there is a rib on
the central pin of the valve, which ensures that it can only be inserted into the valve
base correctly. Locate this rib and align with the corresponding aperture in the centre
of the valve base, located in the top plate towards the rear of the amplifier, between
the two large, black, square transformer covers. With gentle but firm pressure, insert
the valve.
Check one more time that all of the 4 valves are correctly fitted!
VALVE INSTALLATION