Zesto Audio is pleased to announce the launch of their new Eros 500 Select Monoblocks, quite possibly the most powerful Class A tube amps available. Each amp has 250 watts of dynamic Class A power. The Eros 500 Select ships with KT150 output tubes, but has the perfect auto bias to accommodate KT88s, KT120s and KT170s.
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 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