World Audio Kel 80 Instruction Manual - page 7
FIRE UP TIME
1) Now you are ready to fire her up. A useful piece of equipment to use at this stage is a Variac
(rated at 2 Amps or over), to limit the initial voltage input. If you cannot get one do not worry
most budding kit builders are armed with only a multimeter, this is sufficient. It is a good idea to
have a dummy load, a 4 or 8 ohm high wattage resistor depending on how you have set it up, or
an old pair of speakers connected up to the BFA speaker terminals.
2) The next step is to PUT ON THE SAFETY GLOVES PROVIDED TO PREVENT ANY RISK OF
RECEIVING ANY ELECTRIC SHOCKS.
3) Switch her on and step back, do not be put off by a slight tinkering sounds this is the noise of
the valves warming up. You should see two small red points of light in each valve, these are the
valve heaters.
4) When the amplifier is working, measure all voltages to ensure they are correct, measure with 0
volts signal input, bearing in mind that a degree of variation (around 15%) is to be expected due
to dependence upon the mains voltage. KEEP YOUR GLOVES ON.
5) Once fully tested fix the two chassis parts together, using the M3 x 10 flat head screws
provided, then fix in place the self adhesive feet.
6) Now you can enjoy the wonders of the KEL 80.
TABLE SHOWS TEST VOLTAGES
voltage
reading
label on PCB
position on PCB
1.5Vdc
k
V6 pin 7
125Vdc
a
V6 pin 5
225Vdc
a1
V5 pin 1
225Vdc
a2
V5 pin 9
130Vdc
k1, k2
V5 pin 3, 6
9Vdc
g3, k
V1 pin 1, 8
9Vdc
g3, k
V2 pin 1, 8
9Vdc
g3, k
V3 pin 1, 8
9Vdc
g3, k
V4 pin 1, 8
-10Vdc
g1
V1 pin 5, V2 pin 5, V3 pin 5, V4 pin 5
255Vdc
g2
V1 pin 4, V2 pin 4, V3 pin 4, V4 pin 4
505Vdc
a
V1 pin 3, V2 pin 3, V3 pin 3, V4 pin 3
6.3Vdc
h to h
6AU6 heater voltage: V6 pin 3 to pin 4
6.3Vac
h to h
5687 heater voltage: V5 pin 4 to pin 8 or pin 5 to pin 8
6.3Vac
h to h
EL34 heater voltage: V1, V2, V3, V4 pin 2 to pin 7
FAULTS AND HOW TO CLEAR THEM
1) Any serious faults will blow the mains fuse immediately. That is your guarantee. Do not
squander it by fitting a larger fuse in frustration, because the situation will get worse not better.
2) The most common mistake will be one of the following:
a) a wrongly placed component
b) a solder link forgotten
c) a component not soldered in place
d) an external to PCB connection wrongly placed
3) To start with turn the power switch off and pull the mains plug out. A way to remedy these
possible faults is to go through the instructions and visually check everything. Always wear your
gloves even though the power is off as some residual charge may be held within the power
supply capacitors. You may need to take out the PCB to access the valve base side.
4) If you are still having problems then call the helpline.
page 6
KEL80 instructions 27/3/00 10:44 am Page 7