The Red Roo Amplifier
Red Roo is a high-quality, single-ended, 5 Watt per-channel, Class-A valve amplifier that can power either loud speakers or low-impedance headphones. It can also be configured as a 10 Watt mono-block. No compromises have been made in the selection of components and the professionally designed printed circuit board aids trouble-free construction.
With a little patience and skill you will have a superb sounding amplifier you can be proud of, at a fraction the cost of a similar commercially built amp.
RedRoo comes as either a design pack or a full kit of parts. The circuit uses DC heaters and a unique power supply that produces no buzz or hum and extremely low background noise. The output transformers are unusually large for the power level, which ensures strong and accurate base reproduction with delicate high frequency details. At RedRoo we encourage experimentation; you can try different types of valves and each output stage can be configured as either a triode, pentode, or ultra-linear stage. There is also provision on the PC board for an optional Bluetooth input module, if streaming from your smartphone or laptop is your thing.
Scroll down to read more, and please let us know what you think.
Many musicians and audiophiles still prefer the sound of an old-fashioned thermionic valve (aka Tube) amplifier. Valves have a typically "warm" and "open" sound produced by the synergy of many factors that solid-state devices just cannot simulate.
A RedRoo valve amplifier lets you experience your favourite recordings just as the original musicians and their sound engineers intended.
"I Built it Myself"
There is nothing like saying I built it myself.
Choose your best way to build our projects: either as a full set of technical documents together with a high quality printed circuit board, or as a kit of parts ready for assembly. Some key components are also available individually, and we also offer the PC board fully assembled and tested.
Please check the experience level required for each project option and also please read the section on valve safety.
Is DIY for Me?
A difficulty level scale (1-5) is shown for each kit-set. The number relates to the information in the table below. levels 1 and 2 do not require previous experience. Levels 3 and 4 require some knowledge of electronic components and skilled construction. Level 5 is for the experienced and skilled constructor.
If you don't have the necessary experience you should either seek help from someone who does, or you should at least build a few simple electronics kits first. Easy steps!
Please also read the section on valve safety.
Valve amplifiers are safe unless they are physically damaged, misused, poorly located, or are being worked-on without taking appropriate safety precautions.
Electrical Safety - Hazardous Voltages
Valve equipment contains hazardous voltages, (several hundred volts, or more), and it can hold that high-voltage charge for a very long time after the power is switched-off. If you are working on valve circuitry make sure it is switched-off and the high voltage power supply is fully discharged.
Burns or Fire Risk
Valves operate very hot and can cause a nasty burn. They can also ignite materials that come into contact with them, such as flapping curtains etc.
● Position valve equipment well away from combustible materials. Leave at least 200 mm clearance on all sides and the top for adequate ventilation.
● Never leave a valve amplifier switched on when unattended. Keep out of reach of small children
Read more about valve safety on the kit information page.