M ASTERSOUND
Reference 845
Integrated amplifier in class “A”
Parallel single ended
Congratulations on your choice!
The Model Reference 845 that You chose is a integrated
amplifier in pure class “A” which enhances the technical evolution of
the famous triode 845.
The output transformer we designed and manufactured for
this triode allows to reach a range of extension which would be
otherwise impossible with the use of standard output transformers
which need work with a negative reaction.
The result is a perfect sound stage and a surprising presence
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Inside
We built the Reference 845 model with the utmost care,
using only selected materials. Our product passed the stricter quality
tests with excellent results and is now ready to offer You many years
of pleasant listening.
A new amplifier needs to be put on at low volume in order to
perform at its best the musicality and high definition of sound.
After a “training” period, You will have to play Your
apparatus for at least twenty minutes before the circuits can entirely
stabilize and reach the ideal temperature for playing.
We therefore recommend that You follow our simple
instructions to get the best results in listening.
Tubes installation
During the transportation the tubes are kept in an appropriate
box and then they must be placed in the correct position (see the
photo above).
The 845 tube is indicated either by letter A, B, C, D which
stand between the pins and are written on the base: that is the right
place for the tube to be installed.
BE CAREFUL: there is only one correct position for the tube! So
please check the right position of the four pins and do not force the
installation in any way: You could seriuosly damage the sockets .
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Rear panel
1. Holder containing a plug with incorporated fuse.
2. Speakers connectors: two with black rings
and four with red rings (8-4 ohms).
3. Our logo label with the serial number.
4. The bias control input.
5. RCA input connector.
Check list
To be done by the dealer:
set up the amplifier with the right impedance 4/8 ohm
suitable for the speakers and select the right main line according to
country.
The above checks are to be made inside the monoblock and
shall be carried out only by qualified staff.
To be done by the Purchaser:
?? Place the amplifier on a solid and flat surface.
?? Place the tubes in their correct socket positions.
?? Connect the speakers to the speaker connectors joining the
positive cable (the red one or the one with the plus sign) to the
red plug and the negative cable (the black one or the one with
the minus sign) to the black plug.
?? Connect the pre-amplifier.
Connect the amplifier making sure that the voltage in Your main line
is the same as indicated on the back of the unit and corresponds to
Your country’s electrical current
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Switching on of the amplifier
On the front panel of the monoblock there are illuminated
with a red led lights, which should go on when You switch on the
amplifier, indicating the correct functioning.
When the inner tensions have reached the correct level, while
the red led light grows bright, the Reference 845 is ready to work.
Only after the amplifier be pre-heated for at least twenty
minutes, will it reach the ideal temperature so as to get the best
results in listening
Last recommendations
Any change of interconnectors (cables, etc...) must be done
with the amplifier switched in the off position.
Never move or remove the amplifier when tubes are still hot.
Never install or remove tubes when the
amplifier is still switched in the on position.
Maintenance of the amplifier
Use gently a wet and soft cloth (buckskin) to clean Your
amplifier and dry immediately.
Never clean Your amplifier when hot or running.
Do not forget to take out the plugs before starting to clean the
amplifier.
The contents of the box
?? 1 amplifiers
?? a complete set of select tubes
?? 1 feed-line cables
?? the warranty
?? 1 user’s handbook
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Specifications
?? Parallel Single Ended tube amplifier in Classe “A”
?? Output power 2 x 40 Watts
?? Final tubes 2 x 845
?? Pre-driver 2 x ECC82
?? Driver 2 x 5687 WB
?? Input sensitivity 1 Volt
?? Input impedance 100 K Ohm
?? Load impedance 4 - 8 Ohm
?? Output transformer Mastersound
?? Negative feedback “non-existent” 0 dB
?? Frequency 8 Hz / 30 kHz – 0 dB
?? Dimension 64 x 26 x 40 cm.
?? Weight 50 Kg
WARRANTY
Your Reference 845, except the tubes, comes with a two years
limited warranty covering defects in material and craftsmanship.
During the warranty period, repairs are provided free of charge.
Transportation costs and from the repair provider has to be paid by
the owner.
This warranty is void when:
?? the serial numbers have been removed
?? the screws fixed to the underside, have been removed
?? other kind of tubes different from the original have been used.
?? the amplifier has been operated without loudspeakers.
?? violent damage to the amplifier.
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MASTER SOUND s.a.s.
Via Cima XII n. 14 - 36051 Olmo di Creazzo (Vicenza) Italia
Tel. +39 0444 521733 - Fax +39 0444 279525
Email: mastersound@aruba.it web site:www.mastersoundsas.it
MASTERSOUND
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