CA21 manual
User manual
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FUSE
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Mystèreca21
INSIDE
Mystèreca21
Description
The ca21’s full-size chassis provides a much larger playground for
Mystère’s European engineers. It gives them space, a tremendous
advantage for less restrictive designs, for more and improved power
supplies, and for the most advantageous wiring positions.
Specifications
Bandwidth 8Hz-200kHz @ 47K load
Noise 104dB wtd-a ref 1V
It takes a lot of trial and error to find the best route for wires; the
more space, the more options - but ultimately, the better the result.
With these separates, the results are phenomenal.
Gain
9x = 19dB
Distortion 0,03% @ 100mV output
0,03% @ 1V output
Like the ca11, the ca21 uses an SRPP (Series Regulated Push-Pull)
circuit for high gain, low distortion and very low output impedance
by using a variation of the White Cathode Follower. The circuit uses
no negative feedback for more natural tonality.
Input imp. 150 kOhm
Output imp. 592 Ohm
It uses a single 5AR4 for rectification followed by a massive pi
network consisting of a big inductor, separate left and right channel
capacitors, regulator circuits and DC filament supplies.
Further improvements are realized by using a larger power
transformer and increased power supply filtration. Add this
together with high quality, heavy duty, 24-step volume attenuator
and fast, wide-band polypropylene caps, point-to-point wiring with
rigid copper wire, loosely insulated with silk tubing and you have a
linestage preamp second to none.
Max. headroom 25dB rel to 1V output = 19V
Crosstalk -94dB 20Hz – 20kHz
Net weight 20 kg
Dimensions 430x420x200 mm (lxwxh)
Websites
www.mystere-eu.com
www.mystere-usa.com
Mystèreca21
Thank you
We would like to thank you for choosing our Mystère ca21 preamplifier as an
important part of your music system.
Working with components across the spectrum day in and day out for more
than 30 years led us to adopt an unassailable philosophy: the only acceptable
level of quality for the products we produce is the highest quality, regardless
of ­price point.
We have staked our reputation on this and are certain that the products we’ve
already brought to market reflect this principle. We feel comfortable in stating
that our standing in the audio community is of the highest order and we’re
certain that Mystère will only serve to enhance that standing.
We hope that the Mystère ca21 preamplifier will make you want to follow our
next steps in expanding this new range of products. If you have any questions
or comments, don’t hesitate to contact us. You can also share your thoughts
with others at www.audioreview.com or other review sites. On the www.mystere-eu.com website you will find links to these and other websites. Our prices
are kept low by using word-of-mouth and customer feedback, and we would
appreciate hearing what you have to say about our product. If you need service during or after the warranty period, please contact us.
Thanks again for your support!
Herman van den Dungen - DUROB AUDIO BV
Table of Contents
Description ................................................................................................. 2
Specifications ...................................................................................... 2
Thank you ...................................................................................................... 3
Warning - Setup - Contents ...................... 4
Inputs - Controls ......................................................................... 5
Protection ...................................................................................................... 5
Tube Basics ................................................................................................. 6
Troubleshooting ......................................................................... 7
Warranty Info ........................................................................................ 8
Story - Contact ................................................................................ 9
Copyright - Durob Audio B.V. 2009
Mystère
To prevent serious injury, electrical shock or fire:
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Do not operate with bottom plate removed.
Keep away from rain and moisture.
Disconnect all cable connections before changing fuses and/or tubes.
Do not replace tubes without reading instructions.
Do not replace fuses or tubes if you have any doubt about your ability to
do so. We accept no responsibility for any personal or material damage
due to incompetent use or users.
Remove the Mystère ca21 from its packaging. Use the white gloves.
Remove tube cage. Carefully pull it up and away from the preamplifier.
Remove the protective foam surrounding the tubes.
Check that each tube is firmly seated in its socket. Use gloves.
Replace cage back in its place if desired.
Check to see the power switch is off (down).
Connect each source to the corresponding plugs.
Connect output of preamp with input of poweramp.
Your Mystère preamp inverts phase. Connect positive (+) to positive and
negative (-) to negative at your poweramp, then positive to negative, and
negative to positive at your speaker. Do so for both speakers.
Plug powercords into pre- and power amplifier, then into wall sockets.
Switch the preamplifier on and wait for 30-60 seconds to warm up.
Switch the poweramplifier on after the preamplifier has been on for 3060 seconds.
The tubes will be warmed up and ready to use in about 30 seconds.
Contents
1x Mystère ca21
Preamplifier
1x Power Cord
1x Owner’s Manual
1x White Gloves
Tubes 4x 6SN7
1x 5AR4
Fuses Littelfuse Series 218 or 219
1 x 0,63AT (100-120VAC)
1 x 0,315AT (200-240VAC)
Warning
Do not replace fuses with any
fuse other than the same type
and rating as used by the factory.
ca21
Front panel - Rear panel
The front panel and
the chassis of the
Mystère models are
finished in high gloss
piano lacquer. The
volume is controlled
in pre-defined steps
with the knob on the
right, source selection is on the left. Your
sources are labelled 1,
2, 3 and 4 (no functional
differences
between these). The
power switch is located on the right side of
the amp, just behind
the front plate.
Looking at the rear
panel, you will note
you have 4 pairs of
stereo inputs, 1 set
of preamp outputs.
terminal.
Fuse Protection
A note on fuses: Fuses are safety
valves. They should always be
replaced with the exact same
value and type.
Warning: Never attempt to
check or replace a fuse while the
amplifier is plugged in. Turn off
the amplifier. Unplug all speakers,
components and AC cords. Wait
10 minutes to let tubes cool
down and the circuit to fully
discharge.
Mains Fuse:
The mains fuse is located on the
rear of the amplifier, at the top
of the power cord socket. The
fuse holder can be snapped out
using a small slotted flat blade
screwdriver.
Mystèreca21
Tube basics
The 6SN7 and 5AR4 tubes will have a life of about 10,000 hours.
Here are some tips on using tubes:
• Do not use treatments on tube pins or in sockets.
• If you decide to experiment with other tube types, it’s best not to swap
tubes in and out repeatedly, as you never want to cycle (pre)amplifiers
on and off rapidly. They should be left off for at least five minutes. Further,
every time you insert a tube, you stand a chance of loosening the tube
sockets. It’s okay to have fun, and we support that, but don’t go crazy and
swap tubes in and out twenty times in a day.
• Some tubes and tube socketshave a “center key” which must correspond!
If you use“brute” force and misalign, you will damage important and expensive parts of your preamplifier!!
• The Mystère ca21 has a warm-up time of just a few minutes. While it is
not wise to leave tube power amplifiers on 24 hours a day, you may leave
this preamplifier on though it will result in more frequent tube replacement. Through experimentation come to a conclusion that fits comfor­
tably with your lifestyle.
• Break-in yields improvements. Every tube, when new, needs to be left
alone for a little while. So, when your preamplifier is new, or when you
re-tube it, it may take a little time to settle in. There is however no fixed
“time rule” for break-in.
• Please note that tubes can vary electrically, and by plugging in the wrong
type of tube you can damage the preamplifier, and void your warranty.
Tube Tip
Some 6sn7 tubes are more
microphonic than others. In
your ca21 the 6sn7 positions
most sensitive to this are the
input tubes V1 and V2.
v1
v2
Experiment if you want
with different 6SN7 tubes in
the market to get your optimal sound. You also may experiment with the different
tube-dampers available in
the market to fine-tune your
amplifier.
Mystèreca21
Troubleshooting
Some tips:
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No output. Power is on, but power LED is off and tubes do not light up.
AC cable makes bad connection in IEC connector. Please check.
No output. Power is on, but power LED is off and tubes do not light up.
Mains fuse is out. Replace fuse as per instructions on page 5.
No output. Power is on, but power LED is off and tubes do not light up.
Mains fuse is not out. Thermal protection may have switched off power transformer. If so, the preamplifier
will switch on again after internal temperature of power transformer returns to normal. Overheating might
be caused by higher environment temperature than normal or heavy use.
No output. Power LED is on and tubes do light up normally.
Check input selector setting, input and output wiring; if all seems to be OK check power amplifier.
Hum or noise coming from one channel.
Noisy tube. First swap the 6SN7 tubes left to right. If noise follows tube swap, then you have found the
problem tubeset. Now swap one by one from left to right. If noise follows, you have found the problematic
tube.
Hum or noise coming from one channel or two channels.
Check rectifier tube 5AR4: swap with new 5AR4 tube, if hum disappears then replace faulty 5AR4 tube.
Noise/distortion coming from both channels.
Tubes may be in need of replacement. Read page 6 for tube basics and replacement options.
Maintaining tube equipment can be easy if you have spare tubes. At least one tube of each type.
If you try these possible solutions and problems persist, contact us or your local distributor for further
investigation.
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Mystèreca21
Warranty Information - Terms & Conditions
Two-year limited warranty.
Six-month warranty on stock vacuum tubes
1. Limited to original purchaser. This warranty is for the sole benefit of the original purchaser of the covered product, and
may not be transferred to a subsequent owner.
2. Conditions & Limitations. This warranty is subject to conditions and limitations, as follows. This warrantly is void and
inapplicable if the product has not been used in accordance with the instructions found elsewhere in this manual, or
if it has been misused, abused, damaged by accident or neglect, or in transport once in possession of purchaser. The
warranty is also void if the product has been tampered with or has been repaired or modified by anyone other than
Durob Audio BV or its specifically authorized representatives.
3. Remedy. If this product contains material, manufacturing, or workmanship defects, it must be packed in orginal packaging and returned to Durob Audio BV or its authorized representative via insured freight, at the owner’s expense.
Returned products must be accompanied by written description of the defect, and a return authorization number
(available from Durob Audio BV or the authorized representative via e-mail). Upon receipt of the defective product,
Durob Audio BV or the authorized representative agrees to repair the product without charge for parts (except vacuum
tubes if the unit is more than 6 months old), or labor. The product will then returned via prepaid, insured freight, with
carrier at the sole determination of Durob Audio BV or the authorized representative. This constitutes the purchaser’s
sole remedy.
4. Design change. Durob Audio BV and its partners reserve the right to modify their products or change specifications at
any time without obligation or liability to previous purchasers.
5. Miscellaneous. Any implied warranties relating to the above product shall be limited to duration of this warranty. This
warranty does not extend to any indentical or consequential costs or damages to purchaser or third-parties. Our liability
will be no more than the amount you paid for the product that is the subject of a claim. This is the maximum amount
for which we are responsible. This warranty gives you specific legal rights. You may also have other rights which vary
from country to country and state to state.
The Mystère Story
It’s midnight and the year is 1,500 BC. An eerie wind is blowing across the Salisbury Plain in southern England and the flat, green ground is bathed in the
moon’s ghostly light. A faint orange glow can be seen in the distance, seemingly coming from a huge circle of majestic stones that stand out in solitary
grandeur against the barren landscape. As one draws closer, dark figures dancing around the wooden fire that smoulders at the centre of the great circle of
stones become visible. Strangely, not a sound can be heard. The whole place is shrouded in mystery.
I am, of course, referring to the world-famous Stonehenge, which stands to this day as a powerful tribute to the people of the late Stone and Bronze Ages
and consists of a ring of extremely large stones and while modern techniques in archaeology have helped shape new theories about these stones, their
ultimate purpose nevertheless remains a fascinating and enduring mystery.
Whatever their exact purpose was, recent research has revealed that the stones at Stonehenge are able to contain and amplify sounds. Furthermore, most
sounds made in the centre are not clearly transmitted beyond the rings of stone.
Almost all of the stones at Stonehenge were shaped, with the inner surfaces of many stones being dressed to be either flat or concave and their outer
surfaces irregular or convex. The contrasting acoustic experiences between the inside and outside of the stone circle that result from the shaping and
placement of these stones may have been utilised by the ancient builders to isolate people on the outside from the activities at the centre. An audience
occupying the inner circle of Stonehenge would have heard amplified sounds. In contrast, no-one outside the monument could have clearly seen or heard
events within, thus creating a sense of mystery!
Recent research suggests that the original Stonehenge probably had an almost concert-like acoustic that our ancestors developed and perfected over
many generations. While undertaking a series of tests, one researcher commented, “A simple drum beat sounded incredibly dramatic. It felt special.”
Similarly, we want to invite you to join our select inner circle of audiophiles to sample the delights of the Mystère series. Be enticed towards the faint orange
glow of the tubes that peer out from between the vertical slots of the sleek cover. Marvel at the realism and joy of music that has been perfected over many
generations of equipment design, resulting in the Mystère range of audio products. Now your search for the ultimate experience is over!
Sales & Support
Mystère - Durob Audio BV
P.O. Box 109
5250 AC Vlijmen
The Netherlands
+ 31 73 511 2555
www.mystere-eu.com
[email protected]
Email us for your local distributor
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