ZESTO AUDIO EROS 500 SELECT MONOBLOCK CLASS A KT150 AMPLIFIERS

Zesto Audio of the USA has announced the launch of their new Eros 500 Select Monoblocks Class A tube amps available.

George Counnas, President and Chief Design Engineer of Zesto Audio says, “I was excited to find that my new circuit design using KT150 tubes produced so much power that they didn’t even break a sweat creating such beautiful, effortless musical detail from my speakers”.

Zesto Audio Eros 500 Select Monoblock front

ZESTO AUDIO EROS 500 SELECT MONOBLOCKS

Each amp has 250 watts of dynamic Class A power. The Eros 500 Select ships with KT150 output tubes, but has auto bias settings to accommodate KT88s, KT120s and KT170s.

Rear of the Zesto Audio Eros 500 Select Monoblocks

AUTO BIAS SELECT SWITCH

The Zesto Audio Eros 500 features a three-position Auto Bias Select switch.

Auto Bias Select

George says, “The Bias Select switch is safe and easy to use, and you can change on the “Fly” so you can hear the difference. You don’t have to be an engineer to enjoy my equipment.”

KT150 VALVES

The Eros 500 Select has options including RCA or true floating transformer balanced XLR connectors. The Eros 500 Select has four different tube options and three power options for the KT150s and KT170s.

There is an independent ground switch to eliminate hum. The Subwoofer SpeakOn connector is Rel Acoustics compatible for a safe and reliable connection. There are two different taps, 4 Ohm and 8 Ohm to better match your speakers.

Zesto Audio Eros 500 Select Monoblocks with KT150 valves

ZESTO AUDIO EROS 500 SELECT 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

SpeakOn subwoofer cable specs: 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

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 resistors 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 located on front panel

Amber LED low voltage and green LED high voltage indicators

Active Components

Six (6) KT150 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)

16 and 14 gauge Zinc plated steel enclosure

ZESTO AUDIO EROS SELECT 500 PRICE

The Eros 500 Select Monoblocks retail price is $35,000 a pair and ships with KT150 output tubes. Shipping and taxes are additional.

HiFi Pig Says: Zesto Audio has a well-deserved following for their valve gear, which we have enjoyed greatly at HiFi Shows.