The Red Roo SE5 Tube Amplifier Kit
Class-A Sound. The Red Roo SE5 tube amplifier kit is a compact top-quality, class-A, single-ended design that can deliver five-watt RMS output to loudspeakers or headphones.
The circuit uses a two-stage triode Constant Current Draw Amplifier (CCDA) driving a single-ended (SE) EL34 output stage. The EL34 single-ended output stage can be configured either in triode, pentode, or ultra-linear modes, with ultra-linear being the recommended mode for most people (unless you choose the audiophile upgrade which is triode or pentode only).
Easy to Build. The SE5 tube amplifier is very easy to build. For a trouble-free build, order the solderless kit which is supplied with fully assembled and tested PC boards. Alternatively, if you want the full kit building experience, order the full kit of parts which comes with individual components that need to be soldered into the PC boards.
High Quality Components. The RedRoo SE5 stereo amplifier uses high-quality components throughout such as audio-grade polycarbonate coupling capacitors, low ESR conductive polymer hybrid aluminium electrolytic cathode-bypass capacitors, gold pin tube sockets, and large output transformers for accurate bass reproduction. The PC Boards are extra thick with 2-oz copper tracks for enhanced durability and heat transfer.
User Functionality. The front panel has a large solid metal volume knob and toggle switches for power on-off and input selection, and a 1/4-inch headphone jack. The rear panel has input connectors, speaker connectors, a speaker impedance switch, and a feedback on-off switch so you can experience no global negative feedback sound.
The input selector toggle switch selects between two sets of RCA inputs and a Bluetooth input for streaming from your smartphone or computer. A 3.5mm jack socket is provided on the second RCA input.
Audiophile Upgrade. An audiophile upgrade is available for the SE5 stereo amplifier which includes audiophile-grade output transformers, and Mundorf EVO or Auricap coupling capacitors. The upgrade makes a very noticeable difference to the sound for people with high-end loudspeakers and a quality sound source. The audiophile upgrade does not support ultra-linear mode (triode mode is best for audiophiles).
Power Supply Design. Mains power does not enter the chassis and the unique power supply design, DC heaters, and an earth-loop breaker all help to eliminate power supply-induced hum or buzz from the speakers.
Care is required as the circuit contains hazardous voltages up to 280V DC.
The SE5 dimensions are 185mm wide, 215mm deep, and 165mm high.
