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Stereo 845 Integrated Amplifier
IMPORTANT!
THIS MANUAL CONTAINS
ESSENTIAL HEALTH & SAFETY
INFORMATION FOR YOU AND
YOUR AMPLIFIER. PLEASE
READ & KEEP SAFE AND
REFER TO IF NECESSARY
About the Stereo 845
Thank you for purchasing our
integrated amplifier using the wonderful RCA
developed 845 triode audio power valve.
YOU MUST READ AND UNDERSTAND THIS
MANUAL THOROUGHLY IN ORDER TO GET THE
BEST PERFORMANCE AND SAFE OPERATION.
If you are in a hurry to get your ST845 up and
running go to Chapter 2 "Quick Set Up Guide".
This will tell you the minimum amount of
information to get the amplifier working.
The ST845 pure valve amplifier is the result of years
of careful design and listening tests with a wide
range of speakers. Icon Audio amplifiers are hand
built
using
carefully
components. The transformers are hand wound
using low oxygen copper and special Japanese long
grain iron. Finally each amplifier is valved, carefully
commissioned and tweaked for best performance in
Leicester UK.
In order to get the best out of your amplifier, please
read the "SET UP" notes. These contain important
information about the correct operation and safety.
Should you be uncertain about anything please
contact your dealer or one of our team.
icon Audio
User Manual for:
Shown with upgraded "David Shaw" and Full Music driver valves
Contents
ST 845
stereo
selected
audiophile
8 Specifications
Valve amplifiers do need a little more attention than
their
solid-state
counterparts,
improvements are well worth it. In this manual we
have tried to include everything that you need to
know. Please let us know if you find any errors or
feel that we have missed anything out.
ST 845
The
is a push-pull all triode integrated
amplifier using the 845 directly heated triode power
valve. These have very special characteristics which
many people consider give the finest reproduction of
any valves. Similar to but pre dating the Western
Electric 300B but with more power and punch.
These are employed in fixed-bias mode which gives
maximum power, cool running and low distortion.
You MUST occasionally check the bias (at least
twice a year), see chapter 6. The driver and phase
splitting is also done using vintage triode valves for
best sound quality. A Mullard GZ34 (US 5AR4)
valve rectifier is used for a controlled warm-up and
extra warmth. The pre-amplifier circuit is a "passive"
design using a high quality ALPS pot along with gold
plated PTFE RCA input terminals and silver plated
high purity PTFE audio cable. This combination of
quality audiophile components, simplicity and time
honoured hand built construction is guaranteed to let
you bask in the warm glow of effortless music
reproduction, exactly as it should be.
but
the
sonic
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Table of Contents
Related Manuals for icon Audio Stereo 845
Summary of Contents for icon Audio Stereo 845
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Page 1: Table Of Contents
You MUST occasionally check the bias (at least range of speakers. Icon Audio amplifiers are hand twice a year), see chapter 6. The driver and phase built... -
Page 2: Final Inspection
1. Final Inspection - Your Guarantee of Quality To assure you of optimum performance and reliability, this amplifier has passed our rigorous final inspection and listening test by the Icon Audio team in Leicester. …./…./…. Date ………. Model ………. Amp Serial Number ……………………………... - Page 3 ST845 Layout and Features Page 3 *See engineers notes at rear...
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Page 4: Quick Set Up Guide
7 Sensitivity Switch Located on the rear, this switch is “UP” (H) for (high good condition. If not report to Icon Audio or your dealer. It is important that you keep the packaging for sensitivity) operation. If use with a pre-amplifier is required, the switch should be “DOWN”... -
Page 5: Connecting Inputs & Outputs
‘inside out’ with reduced bass. You Your dealer or Icon Audio can advise you. Our highly rated PS1 MM/MC, PS2 MM or PS3 MM/MC can normally confirm this by playing a mono all valve phono stages would be an ideal partner. -
Page 6: Trouble Shooting
24/7 without switching off. Whilst the amplifier will sound at its best when it is properly value and not performance. Icon Audio normally keep warmed up, there is no advantage leaving it switched a range of upgrade valves in stock. Ideally valves on when it is not in use. -
Page 7: Bias Adjustment
7. Service: Should you suspect a problem, you could Check regularly at switch on. Regular adjustment return the unit to your dealer or Icon Audio for a periodic should not be necessary. service or return the valves for testing free of charge. - Page 8 3000 to 5000 hours use. 6SN7 should only be replaced with modern types. Generally speaking valve failure will fall into Icon Audio is happy to check the valves/amp or re- bias your amp free of charge. one of these categories:...
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Page 9: Guarantee
Icon Audio. This amplifier is guaranteed by the dealer you purchased from for 12 months from the date of... -
Page 10: Engineers Notes
These notes are only intended for use by an engineer qualified to work with high voltage triodes like the 845/805. Owners should refer any problems to a dealer, service agent or Icon Audio depending upon area purchased in. The amplifier may be inverted by supporting the transformers on non abrasive surface (e.g.