4
D
Trouble shooting
Excessive Hum
Ensure any turntable “ground lead” is connected to
the PS3. The power supply should be positioned
away from the turntable and pre-amp. And the
preamp should be positioned away from the turntable
motor and other units. You can check this by moving
the pre-amp around whilst listening to the effect
through you speakers. Some experimentation may
be required for the best effect.
PS3 Pre-amp Dead
If the LEDs or valves do not light up, check the 1amp
mains fuse at the back of the amplifier. To gain
access, remove the mains lead. The fuse is in a
small plastic drawer, which forms part of the socket
assembly. To open insert a flat bade screwdriver or
similar and prise open.
The fuse in use is the
innermost
the outer is a spare. Should the
replacement fuse also blow there is a fault.
Replacements should be 1Amp ‘anti-surge’.
The fuse in the mains plug should be a 3 amp fuse,
although unlikely, this should be checked if the
amplifier fuse is OK.
No sound
This is likely to be connections. Have you selected
the right input? Are the connections OK? Is
everything switched on? Are the speakers
connected? Is MC selected on the MM only version?
Loss of one channel is occasionally due to oxidised
switch contacts. Remedy: use switch 30-40 times.
Distortion
Could be either the pick up mis-tracking/dirty stylus,
or a fault. Try another turntable or phono pre-amp to
prove this. Or check setting and wiring.
Valve Replacement
Assuming average regular use we would suggest
that the ECC88/6922s are replaced every 2-3 years,
sooner if you suspect a problem, or later if you happy
with the sound. Sudden failures, microphonic or noisy
valves may be replaced individually if the others are
relatively new. The larger 6SN7 pre-amp valve, and
the power supply will generally last twice as long
apart from sudden failures.
Contact us for individual cases.
Before removing either cover the power supply
should be disconnected from the mains for at least
10 mins to allow for any remaining high voltage to
dissipate. Do NOT USE WITH THE COVERS
REMOVED!
You will need a 3mm Allan Key to remove the covers.
Valve life will depend upon such things as hours of
use and number of on/off cycles.
Note the position of the valves before removal.
As the valves are crucial to maintaining the
performance and quality, choose them with care.
Valves from Icon Audio will have been selected and
age tested in a similar unit for best quality.
Icon Audio are happy to replace valves and check
to performance of your pre-amplifier, there are
often upgrades available.
It is essential that only the correct valves are
used as similar looking valves have a different
pin connection and insertion could result in
damage to the amplifier and risk of electric
shock. If in any doubt consult your dealer or Icon.
Service:
Should you suspect a problem, you should
return the unit to your dealer or Icon Audio for a
periodic service or return the valves for testing free of
charge.
Specifications and Features
Built in volume control
Stereo/mono switch for better S/N and distortion
from mono and worn stereo records
•
Choke regulated power supply
•
Separate Power supply
•
All hand wired point to point
•
No printed circuit board to ‘colour’ sound
•
Japanese Blue ALPS volume pot.
•
All Triode valves
•
4x ECC88 1x 6SN7 (pre-amp)
•
1x EZ80 1x ECC83 1x 5687 (Power Supply Unit)
•
Sensitivity: 5mv for 1.6v (0.5mv MC)
•
Gain = 320 MM (3200 MC)
•
Load: imp: 47k MM, 100 ohms MC
•
Custom wound MC transformers (option)
•
Signal to noise level -75db (MM unweighted)
•
RIAA Freq response 20hz-20khz +0 - 2db
•
NO feedback used
•
High quality close tolerance resistors
•
Blue LED mains indicator
•
Polypropylene audio capacitors
•
Silver PTFE audio cable
•
DC supply for valve heaters
•
Stainless steel chassis
•
6mm solid alloy front & rear plates
•
Gold plated Input terminals
•
230/240volts 30watts 1.0A anti-surge fuse
•
C E certified
•
Pre-amp 88mmW, 310mmD, 134mmH , 3.9kg
•
PSU 165mmD, 82mmW 80mmH 2.8kg
(Figures in brackets allow for rear connections)
(Specifications subject to change, errors & omissions excepted 17/09/19)
Designed, developed and assembled by David Shaw
in Leicester, each pre-amp is carefully checked &
tweaked plus any custom modifications added as
required before undergoing rigorous tests in all its
important static & dynamic parameters. Finally each
pre-amp is run to allow the valves to “bed in” for
24hrs to ensure you get the best performance.
icon Audio
(UK) LTD
351 Aylestone Road
Leicester LE2 8TA
UK
Email: [email protected]
Phone +44(0) 116 244 0593
Cell +44 (0) 778 715 8791
Fax 0116 244 0593
Direct 17/09/2019
