World Audio Kel 80 Instruction Manual - page 5
2) Start soldering all the resistor first.
3) All the high wattage resistors (above 1 watts) generate heat, thus, it is a good idea to give them
at least 15mm clearance from the PCB to avoid tarnishing of the board. These resistors are the
following: R1, R2, R7, R8, R13, R14, R19 and R27.
4) Solder in all the capacitors, Note well, C1 - C10, C14 are all electrolytics and only need
soldering on the valve base side. Make sure all these electrolytics are correctly orientated as
they will blow. The polarity is marked on the PCB. see fig. 1 page 11
5) Similarly, C11 and C12 only need soldering on the valve base side.
6) Solder in all the bridge rectifiers. Here, you only need solder them on the valve base side.
Orientation is very important. The PCB is marked clearly, but pay close attention
to fig. 2 page 11
7) Solder in the fuse holder, insert the 1.6A slow blow fuse and position fuse cover.
8) Solder in the valve bases so that they are sitting on the valve base side of the PCB. To reduce
any unnecessary stress to the PCB it is a good idea to insert the EL34 valves into their octal
bases a few times before you solder the bases on the PCB. The orientation of the octal valve
base is very important it is marked by a key-hole (large hole, small key) shape on the PCB, this
correlates to the shape of the central hole of the octal base. The B7G and B9A will only fit in one
positon.
9) Wire in the heater links and the PCB inter - links on the valve base side. see page 9
10) Solder in the wire link that connects the anode of V2 to the anode of V4, denoted by a white line
and `link V4A` on the component side.
FIXING OF THE PCB
1) Using the 6 x M3 x 10 pan head screws and the 8 x M3 fibre washer provided, fit the PCB in
place.
WIRING UP THE SIGNAL INPUTS
1) Take 50cm of single screen cable and wire one end to the phono socket on the back panel, the
red signal section to the centre spigot and the screened section to the phono socket solder tag.
2) Wire the other end to the PCB, the red signal section to PCB tab 10 and the screened section to
PCB tab 9. see page 8
WIRING UP THE MAINS
1) With the mains lead now fitted cut the brown wire 25cm from the end and solder the cut-off
piece to the mains switch and the other end of the cut off piece to PCB tab 2. see fig. 3 page
11
and page 8
2) Solder the blue wire from the mains lead direct to the mains switch. see fig. 3 page 11
3) Solder the brown wire of the mains lead to PCB tab 1. see page 8
4) For 240V operation solder together the violet and grey(thin) leads and isolate. see page 10
5) Solder the brown lead of the mains transformer to the mains switch. see fig. 3 page 11
6) Solder the blue lead of the mains transformer to the mains switch. see fig. 3 page 11
WIRING UP THE SPEAKER OUTPUTS
1) Before you start, you must first select the correct output transformer setting to match your loud
speakers, be it 4 ohms or 8 ohms. Most speaker use the 8 ohms setting.
2) Connect up the black BFA speaker post to the following.
a) PCB tab 5, using 1/1.13 black wire. see page 8
b) Blue leadout of the output transformer. see page 10
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KEL80 instructions 27/3/00 10:44 am Page 5