Feliks-Audio ESPRESSIVO mark II User manual

PRODUCT GUIDE
ESPRESSIVO mark II
Headphone Tube Power Amplifier

TUBES INSTALLATION

1. Line inputs
2. Line output (pre-amp mode)
3. Power switch, fuse socket and AC power connection
1. Headphones output
2. Volume Control
3. Source selector
FRONT AND REAR PANEL DESCRIPTION

CAUTION! HOT PARTS. DO NOT TOUCH! BURNED
FINGERS WHEN HANDLING THE PARTS. WAIT 15 MIN
AFTER SWITCHING OFF BEFORE HANDLING PARTS.
WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER NO USER SERVICABLE
PARTS INSIDE, REFER SERVICING TO QUALIFIED PERSONEL. HOT SURFACES, KEEP
COMBUSTIBLE MATERIALS AWAY FROM TUBES, DO NOT BLOCK AIRFLOW
CAUTION

GENERAL SAFETY INSTRUCTION - READ BEFORE FIRST USE!
The amplifier should be plugged to power socket with ground connection. Please note
that tubes can reach operational temperature with exceeding 150 Celsius therefore
tube exchange should be done with the device unplugged from AC power, after
allowing the tubes to cool down and letting the capacitors discharge (minimum 15
minutes). Recommended ambient temperature for the amplifier to operate is
between 15 and 30 Celsius. In case of tube glass cover break, stop the device operation
immediately and switch off the power supply from the mains. Remove the damaged
tube after cooldown of the device (min. 15 minutes).
DEVICE VENTILATION
Proper ventilation provides long lifetime of the amplifier. Upper and lower cover are
equipped with ventilation holes which guarantee a free airflow. Bottom ventialation
holes provide cool air into the device case, which flows through it and escapes at the
top cover. Do not obstruct the airflow around the amplifier. Allow at least 30cm(12
inches) free space above the tubes and 10cm (4 inches) for the rear and sides. Do not
place the device on any other heat source. All ventilation openings should remain
uncovered during operation of the amplifier.
LIMITED WARRANTY
The amplifier was manufactured and tested to the highest quality standards. The
limited warranty covers defects in material or workmanship for 36 months (tubes for

12 months), from date of purchase. Our limited warranty is void if the product is
returned with tampered labels, any alternations or in case of improper use. To request
warranty service, please provide sales receipt / document of purchase and
description of the problem. Product shipping is at buyer's expense.
INSTALLATION AND BREAK-IN PERIOD
Before turning the amplifier on for the first time, please install the tubes in the
sockets, as described on the illustration. Take care while installing the tubes, ensure
the pins fit appropriate holes in the socket. New amplifier requires a break-in period
which takes place during normal use of the device. Please note that the optimal sound
quality will be reached after approximately 30 – 50 hours of operation. In day to day
use, tubes reach their operational temperature after 15 minutes from starting the
device. All tubes must be installed before turning on the amp. Never place the unit in
an unstable location. A device may fall, causing serious personal injury or death. Only
use furniture that can safely support the device. Ensure that the amplifier is not
overheating the edge of the supporting furniture. Do not place the device on tall
furniture without anchoring the furniture. Do not place the amplifier on cloth or other
materials that may be located between the unit and supporting furniture. Keep away
the device from the reach of children.
ABOUT FELIKS-AUDIO
Feliks Audio is a boutique manufacturer of hand-crafted tube amplifiers, with over 20

years of audio solutions development experience. All our products are in-house
engineered, tuned and assembled at our site in Lubliniec (Poland). We create special
and unique designs, blending together technology and tradition.
Originally, Feliks Audio focused mainly on custom made amplifiers tailored to client's
order. Over the time we have developed many innovative and sophisticated audio
solutions. Thanks to that we have gained valuable knowledge and experience across
broad range of applications. Our amplifiers, among them Espressivo, Elise and
Euforia, have won many supporters across the world.
Our products offer a perfect blend of passion for honest sound, great attention to
technical details and beautiful finish. We do follow design simplicity, minimizing the
number of elements in projected signal path. Thanks to this approach we ensure that
the sound produced by our devices is pure and true.
WHAT MAKES ESPRESSIVO mark II SO SPECIAL?
Espressivo is the entry level OTL amplifier by Feliks Audio and offers amazing sound
clarity with the typical “tube” feel. The amplifier is fully handmade from high quality,
carefully selected components and can take 3 selectable audio inputs. The amplifier's
sweet spot lays with medium to high impedance headphones (from 60ohm) and can be
also used as effective tube pre-amp for both tube and transistor amplifiers. In its
second iteration (as Mark II) it is built around two 6922 driver and two 6N30P power
tubes.

§Incredibly detailed music scene
§Very low noise levels and AC interferences
§Broad frequency: 15 Hz – 45 kHz +/- 3dB
§New electric circuit built around high grade tubes – two 6922 drivers and two
6N30 power tubes, resulting in much improved details and musicality
§Integrated 3-way sound source selector performs very well also as pre-amp for
tube or transistor power amps (in the pre-amp mode the 3-way source selector is
used)
§Internal resistance reduced by ~20% providing more power to drive even low
impedance headphones
§New improved gold plated ceramic tube sockets
§Pre-amp mode implemented
§Input/output safeguards eliminating undesirable power on/off noises and
distortions
§Available in 4 exclusive finishes
§Extended 3-year warranty
TECHNICAL SPECIFICATION AND ELECTRICAL SYSTEM DESCRIPTION
Espressivo is built with 2x 6N30P and 2x 6922 tubes. Power supply is based on a

custom made stabilized toroidal transformer with electronic ripple suppression. The
amplifier is equipped with automatic bias circuit, therefore no re-tuning is required
after changing tubes.
§Impedance: 100 k ohm
§Frequency response: 15 Hz - 45 Khz +/- 3 dB
§Power output: 400mW
§Amplification level: 20dB
§THD: 0.4 % (300 ohm, 20 mW)
§Optimal headphones impedance: 60 - 600 ohm
§Headphones output: Jack 6.3mm
§AC: 230V/120V (power cord included)
§Weight: 3.5 kg (7.7 lbs)
§Dimensions without tubes: 275x220x115 mm [10,8x8,7x4,5 inch]
TUBES USED
Espressivo is originally equipped with high quality tubes. Stock pre-amp tubes are
6922 power tube are 6N30P. Tubes can be changed by the user, to the following:
Driver tubes: E88CC, 6N23P, 6DJ8,
Power tubes: no replacement

SUPPORT
We wish you many happy hours enjoying your new tube amplifier. Should you have any
inquiries please contact us directly at [e-mail] or visit our website
www.feliksaudio.pl
Manufacturer: HFelektronika, 42-700 Lubliniec, 2a Tuwima street

Product name Serial number
Warranty start date
Signature of the warrantor
WARRANTY CARD
This is your warranty card. Make sure your seller has completed all of the
fields below. In the case of a warranty service, include a copy of your
purchase with this card. Please also include a description of the fault with
the card.