Undo the two hex screws on the back plate of
Two hex screws removed from back plate.
Unscrew the philips screw situated in the centre
of the 4 phono sockets.
Remove back plate and note that the ground
wire is held in place between the back plate and enclosure by the top
screw (ie: the screw goes through the ground connector "hole"
and is sandwiched between the back plate and enclosure when you are
refitting the back plate)
So, when you refit the back plate the screw
feeds through the hole of the ground connector and then into the enclosure.
Now work on the front panel. Do not remove
the volume knob. Unscrew the two hex screws.
Once you have removed the two screws from the
front panel you can slide the PCB out as shown. The PCB is located in
slots either side of the enclosure so just slide it out until the valves
PCB exposed ready to replace the valves.
To remove the valves just grasp them and pull
upwards out of the sockets whilst gently rolling them from side to side
(wiggle them slightly whilst pulling upwards)
Fitting the new valves is easy just make sure
the pins line up with the holes in the valve socket (as shown) and push
them fully home into the socket. They will only go in one way, just
like fitting a mains plug into a socket, so don't worry....... there
is no way you can fit them the wrong way round.
OK, that's the job done now all you've got
to do is fit the front and back plates back into position. Slide the
PCB back into the enclosure and then tighten the two hex screws on the
front plate. Don't overtighten them, just finger tight and then a quarter
of a turn to "nip" them up is all that's required.
Front panel screws tightened.
OK, now it's time to fit the back plate back
into position. First thing to do is to feed the top screw through the
back plate and then through the ground wire connector hole into the
enclosure... remember, this is sandwiched between the back plate and
enclosure as shown.
Tighten top screw ensuring that screw is fed
through the ground tag.
Fit bottom hex screw and tighten.
Fit screw in centre of the four phono sockets.
That's you done! Now go and plug the amp in
and enjoy the sound of your new valves!