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1 Unpack unit carefully. Make sure that it is in good
condition. It is important that you keep packaging for
warranty/service return.
2 Fit the valves if necessary. Or if fitted check that
they are seated properly. (see also valve replacement)
3 You may connect directly to your source unit
(e.g. CD player) or from the "Record Out" of your
amplifier.
"Loop Out" Facility
This enables you to connect the HP8 between a pre-
amplifier and power amplifier for example, or it may be
used as a "record out". The "Loop out" does not
require the HP8 to be switched on.
4 Connect to mains supply using the attached mains
lead to 230/240v supply. Outside the UK you may
need to change plug or cable, the welded plug
must be removed and replaced with a suitable
type.
Please then remove fuse and dispose of carefully away
from children. The replacement plug should be wired in the
following way Brown to Live terminal, Blue to Neutral terminal and
Green/Yellow to Earth terminal.
5 Connect your headphones and SWITCH ON!
The red mains indicator should light up and unit will
take approximately 40 seconds to start working. All
valves should have a visible orange glow from the
cathode heaters. With the volume control set to
minimum (fully anti-clockwise) there should be no
sound coming from your headphones except a barely
discernable hum.
5a, Headphone Impedance
The right hand knob marked L M and H refer to the
matching impedance of your headphones and are
banded as follows:
Low
8-32 ohms
Med
32-250
High
250-1000
6 Your unit should now be functioning. If not check
wiring again and/Use selector/tape monitor/volume to
choose source program and suitable listening volume.
The best sound quality will be when the unit has
warmed up for at least 20 mins.
7 Health and Safety. The valves when operating have
moderately high surface temperatures. Keep out of
reach of children and pets.
Under no circumstances operate with valves
removed!
Like all valve amplifiers there are potentially lethal
voltages inside (300v DC), which when switched
off can take up to 15 mins to discharge! Do not
remove bottom panel unless you are a competent
engineer. There are no user serviceable parts inside.
Like other household electrical appliances do not leave
unattended whilst switched on.
Placement: be careful to place the HP8 on a stable
surface when it cannot be easily be moved by
accidental pulling of the headphone cable.
Connecting inputs & outputs
Many problems with hi fi equipment involve connecting
leads which are usually either 'Bad, or Wrong
connection'. So it's worth making sure that you have
good connections and that your leads are the right way
round.
QUICK SET UP GUIDE
(nominally 16)
(nominally 100)
(nominally 600)
Inputs
The amplifier will work with any standard piece of hi fi
e.g. CD, Tuner, Tape Deck, Mini Disc, TV, Video
Recorder, DVD etc.
The latest version of the HP8 with the copper plate has
a "loop" through facility which enables the permanent
connection in a hi fi system.
General points
Mobile phone 'breakthrough' is normal
A switch-off 'click' through the headphones is
normal.
Storage in damp conditions could damage
transformers.
Connecting Leads
Use good quality connecting leads, which are no
longer than they need to be.
Leaving the amp switched on
Whilst the amplifier will sound at its best when it is
properly warmed up after about 10 minutes, there is no
advantage leaving it switched on when it is not in use.
It is using electricity and using up valve life.
Conversely the valves and other components are
stressed more at switch on; therefore do not switch on
and off unnecessarily. Although the amplifier should
sound good within a few minutes, like most hi fi
units it will take a couple of months of regular use
before it is fully 'run in'.
Cabinet Care
To remove dust from the cabinet and valves we
suggest gentle brushing with a soft paintbrush and a
duster. Finger marks can usually be removed with a
damp
cloth.
Always
disconnected.
CAUTION – HEALTH & SAFETY!
When making any adjustments remember to
isolate from power supply, and remember that high
voltages can remain present inside for some time
after switch off.
Trouble Shooting
Amplifier Dead
Check the 1amp (2amp USA) mains fuse which is in
the IEC mains socket on the rear. Replacements
should be 20mm 1 or 2 Amp 'anti-surge' or "T" type.
These are available from Icon Audio should you have
any difficulty.
The fuse in the UK mains plug should be a 3 or 5 amp
fuse, although unlikely, this should be checked if the
amplifier fuse is OK.
No sound
Have you selected the right input? Are the connections
OK? Is everything switched on? Are the headphones
connected?
Distorted sound.
Try another source; if sound improves then it's
probably something wrong with the first source. If no
improvement
try
different
improvement could be an amplifier problem.
Hum Problems
Excessive hum is generally caused problems external
to the HP8. For example by a poor grounding in the
signal lead, or a 'hum loop' caused by having too many
earths. This may be identified by unplugging the input
clean
with
the
power
headphones,
if
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