Audio Note Kassai - Manual (Page 2)

MANUAL-ZX158
2
Diagram 1: Kassai Tube Locations
Looking from the front of the amplifier, the next valve to plug in is the 5U4G
valve which goes into the last valve base at the back of the amplifier.
Inspect the locating pin on the bottom center of the valve and align with the
valve base (the locating pin can only go in one way round due to a locating
spigot) and with gentle but firm pressure insert the valve.
Looking from the front of the amplifier, the next valves to install are the 300B
valves which are inserted into the two 4 pin valve bases in the middle of the
amplifier.
It is absolutely vital that these valves are fitted correctly
(1) The larger pins must face the front of the amplifier when fitted to their valve
bases.
(2) The sticker on the valves base must also line up with the sticker on the
copper top plate, that is, A to A, B to B etc., or 1 to 1, 2 to 2 and so on.
Please make sure that both (1) and (2) are correct and with gentle but firm
pressure insert the valves into their sockets. Check again that all valves are fully
inserted in the correct way in their respective valve sockets. Follow the above
installation for both amplifiers.
6SN7
300B 5U4G