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excellent JENSEN paper in oil capacitors which
have a rich expansive warm sound.
We would recommend that you purchase a
replacement set of valves from Icon Audio, these
will be tested and aged for 24 hours in a PS1
before despatch to ensure the best sonic
performance.
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.
Valve Replacement
Before removing valves the power supply should be
disconnected from the mains for at least 10 mins to
allow for any remaining high voltage to dissipate.
NEVER USE WITH THE BOTTOM COVERS
REMOVED!
You will need a small Allan Key to remove the valve
cover rings on the pre amp unit.
Valve life will depend upon such things as hours of
use and number of on/off cycles. A valve may be
considered to have come to the end of its life when
the sound quality has changed (degraded) or it has
become noisy and or microphonic. Ideally you should
replace all three at the same time (keeping the good
one for spares). As a rough guide we would expect
about 3000 to 7000 hours per set.
If the unit is working OK it is best left alone. The most
common faults are low level hiss and spitting noises,
and becoming excessively microphonic.
As the valves are crucial to maintaining the
performance and quality, choose them with care.
.
Warning: It is worth noting that this application is
very demanding from the ECC83 valves. Therefore
valves which are 100% OK in another application
may be noisy/microphonic or hum in the PS1. In the
process of testing and commissioning we reject
about 15% of valves for this reason. Used valves are
unlikely to work well. We have also found many so
called "premium" valves to have no advantage. At the
time
of
writing
the
consistently good performers. But feel free to
experiment!
JJ
ECC83S
have
been
7 Specifications and Features
• Built in volume control
• Mono switch for best results from mono records
• Choke regulated power supply
• Separate regulated power supply
• All hand wired point to point
• No printed circuit board to 'colour' sound
• Japanese ALPS volume pot.
• All Triode valves
• 3x ECC83
• 2x 0A2 (WY1) regulator valves
• Sensitivity: 5mv for 1.6v (0.5mv MC)
• Gain = 320 MM/50dB (3000 MC/69dB)
• Load: imp: 47k MM = 50dB, 100 ohms MC
• Custom wound MC transformers (option)
• Signal to noise level -75db (MM unweighted)
• RIAA Freq response 20hz-20khz +0 - 1db
• NO feedback used
• High quality close tolerance resistors
• LED mains indicator
• Polypropylene audio capacitors
• Silver PTFE audio cable
• DC supply for valve heaters
• 6mm solid alloy front & rear plates
• Gold plated Input terminals
• 110-120v AC 50/60 Hz 2.0A anti-surge fuse
• 230/240volts 30watts 1.0A anti-surge fuse
• Pre-amp 88mmW, 310mmD, 134mmH , 3.9kg
• PSU 165mmD, 82mmW 80mmH 2.8kg
• C E FCC ROHS certified
(Specifications subject to change, errors & omissions excepted 19/02/20)
Designed and developed 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
351 Aylestone Road
Leicester LE2 8TA UK
www.iconaudio.co.uk
Email: sales@iconaudio.com
Phone +44(0) 116 244 0593
Cell +44 (0) 778 715 8791
Direct 19/02/2020
5
(UK) LTD
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