THIS LISTING IS FOR A PROJECT HORIZON III DIY AMPLIFIER KIT WITH VINTAGE 12AU7 RCA CLEARTOP TUBE PLUS POWER SUPPLY WITH ACRYLIC CHASSIS. SEE MY OTHER LISTINGS FOR A FULLY BUILT AND TESTED PROJECT HORIZON III
This kit requires basic electronics knowledge, use of a multimeter, a quality soldering iron and miscellaneous tools such as flush cuts, sae allen wrenches and so forth. Please contact prior to purchase if you have any detailed questions on the the kit version of this amplifier. A fully assembled and tested version of this amp is also available in our listings! Shown with optional stainless thumb screws available on our site.
Our goal with Project Horizon was to produce a highly tune-able class A hybrid which targets higher impedance headphones (120-600ohm) Project Horizon
will let you roll a LARGE selection of 6 & 12V tubes and will power
them properly with a dedicated heater power supply. Some other features
like selectable output impedance, easy LED bias setting and the ability to take the input capacitors out of line with the audio signal are things other manufacturers just do not offer.
This amp has it where it counts! This amp is open, dynamic and plays with authority. In short, this is not a cheap toy with counterfeit parts on a cheap PCB. This is a beautifully designed & engineered amp you can truly own and enjoy for a lifetime.
Features of Horizon 3.1:- Designed for higher impedance headphones. Best suited for headphones 300-600ohm but OK with headphones 120-600ohm
- 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 (500mA heater current default, 1A available with option supercharger module)
- 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
- Class A output stage, no overall Feedback
- Medical grade power supply included
- 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 1.5, 35 and 120ohm
Actual Project Horizon Measurements- Single ended, class-A output stage
- Power consumption: 13W continuous, 19W peak.
- Power supply: 48VDC (0.55A cont, 0,8A peak)
- Input Resistance: 11k / 31kOhm gain module dependent
- Input Sensitivity (6N23): 270mV (dependent on tube)
- Gain: 20dB (dependent on tube) Changed from the original higher 26dB specification
- Max Output voltage (no load): 14.1Vrms at 300ohm
- Output Resistance: Selectable 1.5, 35 or 120ohm
- Frequency Response: 10Hz – 160 KHz (-0.5dB) with 32ohm load
- Frequency Response: 4Hz – 400 KHz (-3dB) with 32ohm load
- Signal to Noise ratio: 91dBA (dependent on tube)
- Crosstalk: -88dB (dependent on tube)
- THD: > 0.013% (dependent on tube)
- Suitable for: 120-600ohm Headphones
Dimensions:- 6.5L X 5W X 2.75H in inches
Weight: - Acrylic Chassis 1lb (without power supply)
- Aluminum Chassis 1.34lb (without power supply)
NOTE: AMPLIFIER SHIPS WITH US IEC320 CORD ONLY (SAME AS PC POWER SUPPLY WITH
US EDISON PLUG) DIFFERENT COUNTRIES MUST SUPPLY THEIR OWN POWER CORD -
ADAPTER
SHIPPING / SHIPPING TIMES:
- We ship all amps, kits or pcb's via priority mail or global priority mail
- Kits generally ship within 3 business days of receiving payment. Each amp or kit is hand crafted or put together at the time of order
- We ship Monday - Friday and go on the USPS holiday schedule