Zesto Audio EROS 500 Select Manual de usuario
Zesto Audio EROS 500 Select 2022 1 | P a g e
EROS 500 Select
Class A Monaural Power Amplifier
Owner’s Manual
Please read carefully before installing and operating this equipment
Zesto Audio
3138 Calle Estepa, Thousand Oaks, California 91360
805-807-1840 www.zestoaudio.com george@zestoaudio.com
Made in the USA Using US and Imported Parts
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Dear Music Lover,
I wanted to personally thank you for your purchase of my EROS 500
Monaural Power Amp.
I have loved music all my life – as a musician, record producer and
audio engineer. That makes me fuss about sound. That’s a good thing.
Each unit is built by hand with precision and pride to produce the most
enjoyable listening experience for you.
I am proud to put my name on it and honored to share this with you.
Wishing you many happy years of listening!
Sincerely,
-- George Counnas, President of Zesto Audio
FYI:
Zesto is Greek for hot
EROS is the God of Love and Desire in Greek mythology
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Table of Contents
Thank You ……………………………………. Page 2
Table of Contents……………………………… 3
What’s in the box……………………………… 3
Warning and Caution…………………………. 4, 5, 6
Front and Rear Controls……………………… 7
Specifications …………………………….…. 8 & 9
Set Up-Placement, Cables…………………… 10
Power …….……………………………..………. 11
Tubes.…….……………………………...……… 12 & 13
Bias Select Switch…….……………………… 14 & 15
Safety Tips, Fuses………………………….. 16
Operating, Grounding & Turn on………….. 16 & 17
Trouble shooting,………………………………. 17 & 18
Cleaning………………………………………… 18
Warranty Information…………………………. 19
What’s in the box:
Eros 500 Select Monoblock Power Amp
6 KT150 Vacuum Tubes
2 ECC82 (12AU7) Vacuum Tubes
White glove for handling tubes
IEC power cable 6’
What’s not Included:
KT88, KT120, or KT170 vacuum tubes
Interconnect or speaker cables
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Warning and Caution
WARNING: The triangle with the lightning flash symbol displayed on the unit advises the user
of dangerous uninsulated voltage inside the product’s enclosure.
CAUTION: To reduce the risk of electric shock, do not remove the cover. There are no
user-serviceable parts inside; it is recommended that only qualified personnel service this
component.
1. OWNER’S MANUAL: Before powering up the equipment, read all safety and operating
instructions and follow them as instructed. Retain the safety and operating instructions for
future reference.
2. ATTACHMENTS: Use only those attachments recommended by the unit manufacturer, as
others may cause hazards.
3. ACCESSORIES: Do not place the unit on an unstable cart, stand, tripod, bracket, or table.
The unit may fall, causing injury to a person or damage to the unit. Mount the unit
according to the manufacturer’s instructions with the suggested mounting accessory.
4. WALL OR CEILING MOUNTING: Do not mount the unit on a wall or ceiling.
5. WATER AND MOISTURE: Do not use the unit near water (for example, near a swimming
pool, bathtub, wash bowl, kitchen sink, or laundry tub) or in a damp environment (like a
basement or outside in the rain).
6. OBJECT AND LIQUID ENTRY: Do not push objects of any kind into the unit through
openings as they could touch dangerous voltage points and short-out parts, possibly
resulting in a fire or electric shock. Do not spill liquid of any kind on the unit. If water or any
metal object (such as a paper clip, coin, or staple) accidentally falls inside the unit,
disconnect it from the AC power source immediately and contact Zesto Audio for further
instructions.
7. HEAT: Position the unit away from heat sources such as radiators, heat registers, stoves, or
other units (including amplifiers) that produce heat.
8. VENTILATION: Slots and openings in the enclosure create ventilation to protect the
component from overheating. All of these openings must remain unobstructed. Allow at
least 12 inches of clearance above the unit, 1 inch below and an opening behind the unit
for airflow. Do not place the unit on a bed, sofa, rug, built-in bookcase, or rack without
adequate ventilation.
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9. GROUNDING OR POLARIZATION: As a safety feature, the unit may be equipped with a
polarized alternating current line plug in which one blade is wider than the other and a has
an additional grounding blade. This plug will fit into the power outlet only one way. If you
cannot insert the plug fully into the outlet, try reversing the plug. If the plug still will not fit,
contact a licensed electrician to update your outlet. Do not defeat the safety purpose of the
polarized plug.
10. POWER SOURCES: Operate the unit only from the power source indicated on the marking
label on the back of the unit. If you are unsure of the type of power supplied to your home,
consult your unit dealer or local power company.
11. POWER CORD PROTECTION: Arrange power supply cords so that they do not suffer
from foot traffic or pinching by items placed on or against them. Pay close attention to cords
where plugs enter the AC outlet and where they exit from the unit.
12. LIGHTNING: For added protection during a lightning storm or when the component is idle
for extended periods of time, unplug the unit from the wall outlet. This will help protect the
unit from lightning and power line surge damage.
13. POWER LINES: Do not locate an outside antenna system in the vicinity of overhead power
lines or other electric light or power circuits. When installing an outside antenna system,
take extreme care to avoid touching the power lines or circuits; contact with them could be
fatal.
14. OVERLOADING: Do not overload wall outlets, extension cords, or integral convenience
receptacles as this increases the risk of fire or electric shock.
15. REPLACEMENT PARTS: When replacement parts are required, be sure the service
technician has used replacement parts specified by the manufacturer or those having the
same characteristics as the original parts. Unauthorized substitutions may result in fire,
electric shock, or other hazards.
16. SAFETY CHECK: Upon completion of any service or repairs to the unit, ask the service
technician to perform safety checks to ensure the unit is in proper operating condition.
17. IMPORTANT SAFETY NOTE:
• Before connecting a new product such as the Eros 500 Select to your audio or home
theater system, turn off all other equipment (preferably unplugging them from the AC
power source). Many audio components feature automatic turn-on circuits that may
activate during an installation, potentially causing damage to electronic components or
speakers. This type of damage is not covered by product warranties, and Zesto Audio
specifically disclaims responsibility for any such damage.
• Power Cord: The removable IEC power cord provided with your unit was specifically
designed for use with this product, but other AC cords may be used. Consult your
dealer for advice on AC power cords and high quality wire in your system.
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· AC Fuse: The fuse is located inside the IEC power entry connector and is user
replaceable. Only replace fuse with the exact same type that was removed. Only use
slow blow fuse. If the unit does not power up, contact an authorized service
representative.
· Important: Any use of aftermarket performance fuses in the IEC mains will VOID the
warranty.
· • Wiring: Cables running inside walls should have the appropriate markings to indicate
compliance and listing by the UL, CSA or other standards required by the UL, CSA,
NEC, or your local building code. Questions about cables inside of walls should be
directed to a qualified custom installer, licensed electrician, or low-voltage contractor.
18. RECORDING COPYRIGHT: Recording of copyrighted material for other than personal use
is illegal without permission of the copyright holder.
19. FCC INFORMATION FOR USER:
• CAUTION: Any changes or modifications not expressly approved by Zesto Audio could
void the user's authority to operate the equipment.
• These limits are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates and can radiate radio frequency
energy, and if not installed and used in accordance with the instructions it may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
• Reorient or relocate the equipment.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from where the receiver
is connected.
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Front & Rear Panel Inputs, Outputs and Controls
Front panel (not shown)
Power on/off switch:
Turns the unit ON/OFF (located on front panel).
Front panel LED lights:
Green indicates high voltage; Amber indicates low voltage (Both lights will remain on
when unit is in use)
Rear panel
15 Amp IEC Power entry connector:
120V AC power with 10 Amp 5mm x 20mm slow blow fuse.
Optional factory installed 220V, 230V/240V 50/60Hz mains, 6.3 Amp slow blow.
The fuse is located in the drawer compartment in the IEC mains connector.
Inputs:
RCA Single Ended High quality recessed gold pin connectors
XLR True floating ground, differential balanced transformer inputs.
SpeakOn Subwoofer connection (Rel Acoustics compatible)
Ground on/off switch:
Connects or disconnects the ground on XLR inputs.
Outputs:
5-way binding posts with 4 Ohm and 8 Ohm taps with black common
Output speaker fuses:
Individual 10Amp and 7Amp 6mm x 32mm slow blow fuses for each output tap.
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Specifications per amp (based on KT150 tubes)
Output
Pure Class A, Push-Pull Ultra Linear design
250 Watts per amp
4 Ohm and 8 Ohm non-differential output taps
Three 5-way binding posts
10 Amp and 7 Amp Slow-blow speaker fuses (6mm x 32mm)
Non-inverting output polarity
SpeakOn connector for a subwoofer (Rel Acoustics compatible)
Specs for SpeakOn subwoofer cable: Pins +1 and +2 go to the 8 Ohm output and pin -1
goes to ground
Power rating for Auto Bias Select Switch Settings
Left Position:
KT88 = 150 Watts per channel
KT120 = 150 Watts per channel
KT150 = 150 Watts per channel
KT170 = 150 Watts per channel
Middle switch position:
KT150 = 200 Watts per channel
KT170 = 200 Watts per channel
Right switch position:
KT150 = 250 Watts per channel
KT170 = 250 Watts per channel
Inputs
Transformer true balanced differential input
XLR gold pin balanced input with pin 2 hot, impedance 12K Ohms
RCA gold pin single ended input, impedance of 12K Ohms
XLR ground lift switch
3.3 Volts RMS input to reach rated output
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Detailed Specs
Monaural
Auto bias
No negative feedback
Frequency response 20Hz to 30Khz ~ 3dB
Total Harmonic Distortion ~ 0.07% at 1W into 8 Ohms
Gain of 27dB
Noise level > 4 mV RMS into 8 Ohms with input shorted
1% metal film resisters throughout
Polypropylene capacitors throughout the signal path
Power
Large custom Toroidal power transformer
120 Volts AC mains with 10 Amp 5mm x 20mm slow blow fuse
Mains fuse located in drawer compartment of IEC power connector
3 pin 15 Amp IEC power inlet connector
Optional factory installed 220V, 230V/240V 50/60Hz with 6.3 Amp slow blow fuse
Power consumption at rated output 756 Watts
On/Off switch conveniently located on front panel
Amber LED low voltage and green LED high voltage indicators
Active Components
Six (6) KT150’s vacuum tubes
Two (2) ECC82 (12AU7) vacuum tubes
Other Features
Each unit is made by hand
50 hour factory burn in on all circuits and vacuum tubes
Dimensions 17" W X 20" D X 10" H (43.1 cm x 25.4 cm x 50.8 cm)
Weight 79 lbs. (35.8 Kg)
Shipping weight 96 Lbs. (43.5 Kg)
Shipping box 27" W X 27" D X 13" H (68.5 cm x 68.5 cm x 33 cm)
16 and 14 gauge Zinc plated steel enclosure
Two year limited warranty
Six months warranty on 12AU7 Vacuum Tubes, 90 day warranty on KT150 power tubes
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Set up
Placement
Warning! You can damage this amplifier by not providing adequate ventilation on all 6
sides and at least 12” above the unit. It is not recommended to install the Eros 500 Select in
an enclosed rack or directly on a carpet.
Tip! Placement near other components such as network routers, satellite TV boxes,
table or floor lamps can be a notorious source of hum or clicking noise in your system. It is a
good idea to put all your lighting and digital sources on their own power strip.
For best performance, it is not recommended to drive the EROS 500 directly from a DAC or
to use a passive volume control. The EROS 500 is designed to be driven by a powered
preamp.
Cables
Interconnect: Using RCA or XLR interconnect cables; connect your preamp to the inputs of
the power amp.
Tip! If you have a choice, balanced cables are preferred for sonic reasons.
Speaker cables: The output of this amplifier is non-differential. The common black binding
post is grounded. Connect the speaker to the common black binding post and either the 4 or 8
Ohm output red binding posts.
Tip! Take advantage of the multiple taps as your system may respond better to the 4 or
8 Ohm. For example, some systems find there is more bass with the 4 Ohm, and some find it’s
more open on 8 Ohms.
SpeakOn connector is Rel Acoustics compatible.
Subwoofer cables: Two ways to hookup your Subwoofer:
1. SpeakOn cable connection is a more reliable, safer and sonically optimized for your
subwoofer. Ask your dealer for cable recommendations.
SpeakOn cable specs: Pins +1 and +2 internally go to the 8 Ohm output and pin -1 goes to
ground.
2. If you do not have SpeakOn cables, the Eros 500 output is non-differential, so you can
hook up your subwoofer between the common and the red 8 Ohm binding post.
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