FEZZ AUDIO Lybra 300B PSE Integrated Amplifier User Manual

: June 5, 2024
: FEZZ AUDIO

FEZZ AUDIO Lybra 300B PSE Integrated Amplifier User Manual

SAFETY TIPS

Never place the Fezz Audio Lybra amplifier near heat sources, such as radiators, heaters or direct sunlight. Ensure adequate ventilation and airflow
We also warn against exposure of the amplifier to conditions such as very low temperatures and/or high humidity.
During normal operation, the vacuum tubes radiate significant amounts of heat – there is a risk of burns.
The amplifier should be plugged directly into a wall socket. If you must use an extension cord, please make sure that it has load parameters sufficient to ensure proper handling of current delivery to the device.
When cleaning, always disconnect the Lybra from the power source. Use a dry, soft cloth. Do not use water or cleaning agents.
If your amplifier starts to misbehave or to work incorrectly, if it’s temperature gets too high or you start feeling smoke – immediately disconnect the device from the mains.
Due to the risk of exposure to high voltages – please do not open the lid of the amplifier. ATTENTION: This warning remains in force also in a situation where the device is already disconnected from the wall outlet.
Always replace fuses in accordance with the original, intended specification.
Do not make repairs on your own, or adjustments beyond those as described in this manual. Execution of any unauthorized repairs or modifications of the device result in a loss of warranty.

NTRODUCTION

Thank you for Your trust and for choosing the Fezz Audio Lybra amplifier.
Fezz Audio Lybra is one of the finest parallel single ended 300B tube amplifier made by Fezz
Audio. It provides openness and spatial sound. Powerful, sublime, very involving and uniqe to itself. Fezz Audio Lybra gives you the best sounding experience you can get from the 300B tubes.

VACUUM TUBE AMPLIFIER

Many of us, when looking upon audio amplifiers of decades ago, keep repeating a slogan, like a mantra: “Such things are not manufactured anymore”. When we finalny manage to acquire such a amplifier, we treat it in a very unique way. We look for the best possible location to present it, we adore the moment that we switch it on and we shall certainly not fail to mention in passing about this new “treasure” of ours to Any of our visiting guests.
Whatever we do is all underlined by a great feeling of fondness to those times long past.
Why is this happening? The most likely reason is that it is a vacuum tube amplifier. An amplifier with a specific warmth to its sound, with a natural ambience, timber. We also do know that the ‘Big Names’ have created their memorable music albums using vacuum tubes.
When one explores this topic in depth, it turns out that many a prominent musician, till this present day, plays backmusic and creates music using solely analog amplifiers, and they justify their decision with just a few words: “The vacuum tube simply sounds better, it has a soul and an ambience”.

Once that we purchase such an amplifier, set it up, hook it up, a kind of hesitance kicks in … “Gee, this equipment is 40 years old”. Will it continue to be reliable? We are aware that there is contemporary production of vacuum tube amplifiers out there, but these amplifiers are very expensive. Thus, in praxis, they are exclusively destined for the audiophile circles. And it is at this very point where the unique offering of Fezz Audio comes into play. A unique vacuum tube sound, made available at a price point similar to a new, “transistor” based device as sourced from a market.

INSTALLATION OF THE DEVICE

UNPACKING

Please kindly check if the packaging of the Lybra amplifier has not been damaged during transit. If you find any damages, please immediately contact your dealer. Remove the
amplifier and accessories from the packaging. Make sure that the content is not damaged.

Please do not dispose of the original packaging, so as to facilitate possible shipment of the device in the future.

CONTENTS OF THE PACKAGE

The package should contains:

Fezz Audio Lybra 300B vacuum tube amplifier
vacuum tube of type 300b EHG (gold) by Electro Harmonix -4 pcs.
vacuum tube of type 6sn7 by Electro Harmonix -2 pcs.
vacuum tube of type 12ax7 by Electro Harmonix -1 pc.
power cord
user’s manual
cotton gloves
optional: remote control, vacuum tube protective cage

If any of the above items are missing in your package, contact your dealer immediately.

DESCRIPTION OF ELEMENTS OF THE AMPLIFIER

A ) 6SN7 tube sockets
B ) 300b tubes sockets
C ) Volume level potentiometer
D ) 12AX7 tube socket
E ) Source selector
F) Housings for the output transformers

INSTALLATION OF THE VACUUM TUBES

Place the Lybra amplifier on a stable surface. Carefully remove the vacuum tubes from their packaging and install them in the appropriate sockets, according to the stickers on tube
boxes starts from a left side.

The pins in the base of each of the vacuum tubes are “coded”, and this has the result that the insertion of the vacuum tube into the socket is possible only in one correct and appropriate orientation. If, whilst inserting the vacuum tube you sense resistance, and you can not push the tube into the socket, please check the orientation of its pins, rotate the tube to the correct position and try again.

WHERE TO PLACE YOUR AMPLIFIER

Due to the presence of high temperatures during normal operation of the vacuum tubes, the location that you pick to place your amplifier should ensure ample ventilation, a free flow of air. Please maintain at least 10 cm clearance between the housing of the amplifier, together with the vacuum tubes, and other devices or elements of the interior. The sound quality may be degraded as a result of vibrations.
Therefore we recommended to place the amplifier on a flat and stable surface.

CONNECTIONS

source signal inputs
speakers outputs for the right channel
speakers outputs for the left channel
mains switch
socket for the main fuse
IEC power supply cord socket

The figure above shows the rear panel view of the Fezz Audio Lybra amplifier, together with the description of the inputs and outputs allowing for connection of the other elements of your audio system.
Follow the instructions below to connect Your sound system correctly.

STEP 1 / CONNECT THE SPEAKERS

Check the impedance of the speaker set that you posses. Connect the speaker cable to the appropriate terminals on the rear panel of the amplifier. Depending on the impedance of the speakers that you posses, connect it to the terminal marked either 4 Ω or 8 Ω. If your speaker impedance is 6 Ω – connect the speaker wire to the terminal 8 Ω.

STEP 2 / CONNECT THE SIGNAL SOURCES

Connect the signal source to the amplifier inputs IN1, IN2 or IN3. Select the source of input signal by rotating the input selector located on the front panel of the amplifier. In order to achieve the highest sound quality, use only high-quality RCA cables. Pay attention to the proper connection and distinction of the right (R) and the left (L) channels. For the best sound quality, we suggest using the Fezz FAC 01 interconnect cable dedicated for Fezz Audio vacuum tube amplifiers.

STEP 3 / CONNECT THE POWER SUPPLY CORD

Make sure that the amplifier is switched off. Connect the power cord to the IEC socket on the rear panel of the amplifier.
The amplifier is designed to operate at a rated voltage of 110-120V / 50/60Hz. Connecting the device to a mains network with incorrect parameters can lead to damage that is not covered by manufacturers warranty.

FIRST POWER-UP AND GETTING STARTED

Make sure that all of your wiring is connected in accordance with the information as provided above on page 9 of this manual.
Select the source of signal using the rotary selector switch located on the front panel. Set the volume control to minimum. Turn on the mains power of the Lybra amplifier, signalisation light will turn red for 30 seconds. After this time the light will turn white. From this moment the amplifier is ready to use. Make sure the sound source is turned on, then gradually increase the volume level by turning the potentiometer.

The operation of the amplifier narrows down to adjusting the volume via VOLUME potentiometer and selecting an audio signal source via rotation of the SOURCE switch.

”BURNING-IN” THE AMPLIFIER

Any tube amplifier requires an initial pre-heating (or “burn-in”) period, in order so that it achieves its full sonic potential. This is due to the presence of residua polarization of dielectric elements and due to a necessary stabilization of working parameters of the vacuum tubes. The stabilization of the electrical parameters of the system occurs in a natural process whilst playing music through your audio system.
A preliminary degree of pre-heating of the amplifier is reached after about 10 hours of quiet music playback.
The full sonic capabilities shall stabilize and unfold within a time-span ranging from 40 to 60 hours of music reproduction at a moderate volume levels. In the initial period of operation of the amplifier it is advisable to avoid short-term operation periods of the amplifier. Once activated, it should remain operational for a period of about 4-6 hours.

REPLACEMENT OF THE VACUUM TUBES

Your amplifier is equpped with automatic bias module. It’s necessary to use vacuum tubes that have previously been pre-selected and paired.

OPTIONAL EQUIPMENT

TUBE CAGE

HT (pre-in) input

The additional HT (Pre-in) signal input makes it possible to use this amplifier as a stereo power amplifier. In order to make this possible, it is necessary that you have a separate
preamplifier with its own volume control, or a receiver with ‘Pre-out’ output.

REMOTE CONTROL

The remote control anables remote adjustment of the volume level.

BLUETOOTH MODULE

Select the source of input signal to “3”
Turn the Bluetooth mode ON (on your device) and scan for Bluetooth devices. You will see “Fezz Audio” on the device list. Select, connect and pair both devices.
To pair the amplifier with another Bluetooth signal source, please follow the instructions below:
– Turn the Bluetooth mode OFF on the previously used device
– Turn the Lybra amplifier OFF for approx. one minute
– Turn the Lybra amplifier ON
– Turn the Bluetooth mode ON (on your device) and scan for Bluetooth devices.

You will see “Fezz Audio” or “Fezz Audio” on the device list. Select, connect and pair both devices.

TROUBLE-SHOOTING GUIDE

If your amplifier does not work as it is supposed to, it is fairly easy to diagnose and remedy some of the common malfunctions, by following procedures as outlined in this following.

THE PROBLEM	PROBABLE REASON	THE SOLUTION

After turning the power switch to the ON position, the amplifier does not switch on.| A blown fuse| Please exchange to faulty fuse to a new one (8,0 A T), within the fuse holder as depicted with index 4 on page 8 of this user’s

manual.

An improper connection of the mains cable| Please check if the plugs of the mains cable are properly inserted into the electrical mains socket and to the socket as depicted with index 5 on page 8 of this user’s

manual.

The sound produced by the amplifier is distorted. A hum or pops have appeared and are coming from one of the channels.| An improper placement of the vacuum tubes in the sockets| Switch off the amplifier. Wait until the vacuum tubes cool down. Check for proper placement of vacuum tubes in their sockets. If necessary – correct their

orientation.

One of the driver tubes (6sn7) has lost its nominal working parameters| Switch off the amplifier. Wait until the vacuum tubes cool down. Exchange the positions of the driver tubes between channels. Turn on the amplifier. If the disturbing sounds have moved to the other channel, inform Your local Fezz Audio dealer about tube which need to be

replaced.

One of the Power tubes (300b) has lost its nominal working parameters| Switch off the amplifier. Wait until the vacuum tubes cool down. Exchange the positions of the power tubes between channels. Turn on the amplifier. If the disturbing sounds have moved to the other channel, inform Your local Fezz Audio dealer about tube which need to be

replaced..

If You have verified the aforementioned situations, and your problem still persists, please
contact Your local Fezz Audio dealer.

TECHNICAL DATA

Type: Stereo integrated vacuum tube amplifier
Model: Lybra 300B
Output power: 2x15W
Circuit architecture: PSE parallel single ended
Speakers impedance: 4Ω/8Ω
Inputs : 3xRCA
Harmonic distortion THD: <0,25%
Frequency response: 12Hz-60kHz (-3dB)
Power consumption: 180W
AC fuse: 8,0 A T
Net Weight: 18kg
Dimensions (width x depth x height): 420x410x175mm
Tubes: 4x 300B, 2x 6sn7, 1x 12AX7, autobias.
Colour schemes: black, white, burgundy, red
Optional equipment as a remote contol, tubes protective cage, HT-input, BT module

Declaration of Conformity

Manufacturer: Toroidy.pl Transformatory L. Lachowski Sp.k. (owner of Fezz Audio brand)
Address: ul. Mazowiecka 20 16-001 Księżyno POLAND
I declare that the product:
Brand: Fezz Audio Vacuum tube amplifier
Model: Lybra 300B

complies with the following European Union Council Directives and Standards relating to electromagnetic compatibility (EMC Directive 2014/30/EU) and the low voltage Directive (2014/35/EU).
This declaration of conformity is the result of an examination carried out in accordance with
European Standards for EN 60065:2002+A2:2010+A12:2011+A11:2008 for low voltage, as laid down in article 10 of the EMC Directive.