Eros 500 Select Class A Tube Monoblock Amplifiers

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Eros 500 Select Key Features

• Sextet of KT150 output tubes create 250 watts of Class A musical power.
• Class A power is fast for a more lively, immediate response to your music
• The Bias Select switch is engineered with 3 perfect auto bias settings for KT88, KT120, KT150 and KT170 output tubes.
• The Bias Select switch is safe and easy to use, change on the “Fly” so you can hear the difference.
• 4 Ohm and 8 Ohm taps gives you options for your speaker preference. 4 Ohm may give you more base and the 8 Ohm tap may sound more open.
• The optimized frequency response provides the best musical range to benefit the natural harmonic structure of the instruments
• The SpeakOn cable connector provides most reliable hookup for your subwoofer.
• Transformer balanced true differential XLR input offers noise cancelling and rejection, as well as providing ground isolation from your preamp.
• Should you need to eliminate a hum? The Eros 500 has a XLR ground switch installed for your safety. This eliminates the dangerous temptation to lift the ground from the mains.
• The combo Push-Pull and Ultra Linear circuit design provides lower distortion, more power, and a better performance out of your tubes.
• No Negative Feedback in the circuit design provides better dynamic range because it doesn’t compress the music.
• Non-inverting polarity retains the same phase as the input (so your trumpets blow and don’t suck)
• Large Custom Toroid power transformer provides plenty of available power.
• Toroids have lower noise because they concentrate the magnetic field and are very efficient in the 50 to 60Hz mains range.
• Choice of high quality gold plated Single Ended RCA or Balanced XLR connectors to suit your needs or cable preferences
• Gold pin sockets are more reliable because gold doesn’t oxidize when it heat cycles.
• An extensive grounding scheme is designed into the power supply, wiring and all tube circuitry.
• Elegantly designed, heavy duty 14 & 16 gauge zinc plated, fully grounded steel enclosure isolates external noise and vibration.
• All fuses are easily accessible
• It’s ready to enjoy with 50 hours of factory burn in on all circuits and vacuum tubes.
• Each unit is hand built “Made in the USA”

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 = 125 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 8 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