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hum can be from adjacent equipment, so experiment
with moving equipment around to see if this makes
the hum better or worse.
The test for excessive hum coming from the HP8 is to
check it with nothing connected at "zero" volume. If
the hum is barely discernible this is normal. You will
notice some hum on one channel if the volume is
turned up, this is normal, but it will disappear when
connected to a source component. Contact us for
further advice.
One channel missing.
Usually 'bad' connection on either the input or the
headphones. Try swapping the connection over to
establish if the cause is:
(a) Input to the amp.
channel.
(b) Amplifier or headphones. Sound will not move.
Strange noises coming from headphones
Turn volume to minimum on unused input, if problem
corrected either fault with source unit or with
connection. If noise persists, problem with amplifier.
A valve that is lit up is not a guarantee that it is
working properly; conversely a valve that is not lit up
will not be working.
Valve Replacement
Valve life will depend upon such things as hours of
use and number of on/off cycles. As all the valves are
lightly loaded. As a rough guide we would estimate
life of approx 4 to 10 years. But this can vary.
What can happen?
A valve is at the end of its life if one of the following
happens:
Any of the six glowing heaters fails in either
one of the 6SN7s or the ECC83
A valve could get "noisy" or "microphonic"
The emission (and therefore output and
sound quality) may fall.
The valve works intermittently.
An air leak causes the valve to fail and the
silver "getter" material to turns white.
It is essential that only the correct valves are used
as some similar looking valves have a different
pin connection and insertion could result in
damage to the amplifier and risk of electric shock.
It is not good practice to remove the valves
unnecessarily as this can strain the pins and cause
micro air leaks. Icon Audio are happy to check valves
and check to performance of your amplifier, and
advise on the latest upgrades available FOC.
Method:
Switch off, disconnect from mains and allow to stand
for 20 mins to allow voltages to discharge. Replace
valves as necessary. Replace cover and test. Do not
operate without cover!
Service: Should you suspect a problem, you could
return the unit to your dealer or Icon Audio for a
periodic service or return the valves for testing free of
charge. You should carefully remove the valves they
should be well packed in cardboard & foam or similar,
and returned to Icon Audio. (Valves are very rugged if
packed properly).
We welcome any comments you may have regarding
errors or omissions in this manual.
Sound will move to the other
Should you need further advice or information
regarding the use of this unit please contact us.
NEW OWNER?
If you have bought this unit from someone else,
please register with us by email or post stating your
name, address, model, serial number and whom you
purchased from in order that we can keep you up to
date with upgrades and improvements
Specifications and Features
All hand wired point to point
No printed circuit board to 'colour' sound
Japanese Blue ALPS volume pot.
Class A, all Triode circuit
Custom, hand wound transformers
Output impedance matching from 8 to 600Ω
2 x 6SN7 output valves
1x ECC83 first stage valve
2x 1w output per channel max
Signal to noise level -90db
Freq response better than 20hz-20kHz
Total harmonic distortion typically less than 0.2% 1khz
Japanese steel EI transformers with low oxygen copper
Slim profile design
High quality 2W metal film, & wire-wound resistors
Blue LED mains indicator
Polypropylene audio capacitors
Silver PTFE audio cable
Custom hand wound output transformers
Ceramic valve holders for minimum leakage
Gold plated Input terminals
One line input
300mv input sensitivity.
230/240volts 30 watts.1.0 A anti-surge fuse.
C E, ROHS and WEEE compliant where applicable.
11cm W, 35 cm D, 14.8 H, 6.5 kg (remember to allow
space for connections)
(Specifications subject to change, errors & omissions excepted. General 06/06/13)
icon Audio
351 Aylestone Road Leicester LE2 8TA
www.iconaudio.com
Ph +44 (0) 116 244 0593 +44 (0) 7787 158791
(UK) Ltd
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