The amplifiers are shipped without their 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 AMPLIFIERS ARE NOT CONNECTED TO A MAINS
ELECTRICAL SUPPLY, AND THAT THE POWER CORDS ARE NOT CONNECTED
TO THE AMPLIFIER.
Now remove the valves that are packed inside the shipping carton and carefully
unwrap them. Also inspect the amplifiers to check that nothing has become damaged
or dislodged during transit.
You should find the following valves: -
2 x 6SN7 input stage valves
4 x 300B output valves
2 x 5U4GB rectifier valves
Once again, please understand that it is absolutely vital these valves are fitted
correctly.
Looking from the front of the amplifier install the 300B valves first. Inspect a 300B
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 large aperture located in the top plate of each 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 300B valves and the large holes in each
valve socket, and with gentle but firm pressure insert the valve into its socket.
Next, examine the 6SN7 input stage valves. You will see that there is a rib on the
central pin of the valve base, which ensures that it can only be inserted into the valve
socket correctly. Locate this rib and align with the corresponding aperture in the
centre of the valve socket, located in the top plate at the front / centre of each
amplifier. With gentle but firm pressure, insert the valve.
Next, examine the remaining 5U4GB rectifier valves. You will see that there is a rib
on the central pin of the valve base, which ensures that it can only be inserted into
the valve socket correctly. Locate this rib and align with the corresponding aperture in
the centre of the valve socket, 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 6 valves are correctly fitted!
(13 pages)
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