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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).
205Ds have four pins, two are slightly larger, please
observe this when fitting. All four valve are marked with
the socket they should be inserted into. The single
rectifier valve (274B/GZ34/5AR4) should be fitted into the
power supply.
Connect the multipin plug to the power supply unit.
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 HP
205D between a pre-amplifier and power amplifier for
example, or it may be used as a "record out". Using the
"Loop" facility does not require the HP 205D 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.
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 power LED 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
you have selected either "INPUT" or "BLUETOOTH" (if
fitted), the volume is not set to zero and that you have a
an input signal. The best sound quality will be when the
unit has warmed up for about 10 minutes.
7 Health and Safety. The valves when operating have
moderately high surface temperatures. Keep out of reach
of children and pets.
Under
no
circumstances
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.
It is essential to install the HP 205D on a stable non
slippery surface when it cannot be easily be moved by
accidental pulling of the headphone cable.
QUICK SET UP GUIDE
Please then
(nominally 16)
(nominally 100)
(nominally 600)
operate
with
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
The
good connections and that your leads are the right way
round.
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 HP 205D with the copper plate
has a "loop" through facility which enables the permanent
connection in a hi fi system.
•
Leave some gap between the power supply and
HP205D to minimise noise.
•
Some mobile phone 'breakthrough' is normal
•
A switch-off 'click' through the headphones is
normal.
•
Storage
transformers and other components.
Headphone types
The HP205D is designed to work with almost any
conventional moving coil headphones. We use Beyer
Dynamic, Audio Technica and Sennheiser for testing.
Generally high impendence (100Ω plus) headphones will
sound better, more efficient low impedance (less than
50Ω may reveal more noise and will not give the best
results.
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.
valves
Finger marks can usually be removed with a damp cloth.
Always clean with the power 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.
General points
in
damp
conditions
could
damage
Page 3
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