Project Sunrise III... Where to start with this tried and tested beauty? Project Sunrise was our first amplifier design. She has sold all over the globe and has been reviewed, tested and loved for years. She was the first in a series of tweak-able hybrids which simply give so much more vs. the competition. She is what started all this madness for us! If you are looking for an amplifier that can really deliver specifically into lower impedance headphones, then Sunrise III is for you. Overall, an outstandingly musical amplifier with great power.

Features of Sunrise 3.1

• Designed for medium to low impedance headphones. Best suited for headphones 32-300ohm
• Line output for pre-amp use (volume controlled)
• Manual bias design with easy-set LED bias system, no multimeter needed
• Manual voltage setting with quick access through top cover
• Variable input gain with easy to swap module
• Capable of utilizing a wide range of 6v and 12v tubes. More options available with adapters (1A heater current)
• Selectable output impedance per quick access jumpers located on the sides of the amplifier
• Lightning quick protection circuit with tube warm up delay
• Onboard RGB LED under the tube to dial in a color that suits you
• Top quality components sourced in the US from reputable distributors. No gray market or counterfeit components that plague other manufacturers (designed for the long haul)
• Beautiful piano gloss black .096 thick double sided PCB in 2oz copper with top and bottom ground planes & gold wash. Will not bend or flex while inserting a tube
• Medical grade power supply included
• Class A output stage, no overall Feedback
• 5 YEAR WARRANTY on G1217 built amplifiers
• Shipped, built and kitted from the US
• US / Netherlands design team

For Advanced Tuners:

• Input capacitor section is drilled for multiple capacitor footprints. 2, 2.5, 3.5, 5 or 7.5mm spacing available
• Output capacitor section is drilled for 7.5mm
• Power supply capacitor section is drilled for 7.5mm
• Input capacitors can be bypassed for optimal sound (can result in a scratchy sound only when adjusting volume)
• Variable output resistance, selectable from 1, 32 or to 69ohm

Actual Project Sunrise Measurements:

• Single ended, class-A output stage
• Power consumption: 13W continuous 19W peak
• Power supply: 24VDC (0.55A cont, 0,8A peak)
• Input Resistance: 11k / 31kOhm gain module dependent
• Input Sensitivity (6N23): 270mV (dependent on tube)
• Gain: 14-26dB (dependent on tube)
• Max Output voltage (no load): 5.4V
• Output Resistance: Selectable 1, 32 or 69Ohm
• Frequency Response: 4 Hz – 350 KHz (-3dB) with 32 Ohm load
• Signal to Noise ratio: 91dBA (dependent on tube)
• Crosstalk: -88dB (dependent on tube)
• THD: > 0.013% (dependent on tube)
• Suitable for: 32 - 300 Ohm Headphones

Dimensions:

• 6.5L X 5W X 2.75H in inches

Weight:

• Acrylic Chassis .89lb (without power supply)
• Aluminum Chassis 1.24lb (without power supply)