The new RedRoo Guitar Amplifier Kits have been on trial with professional Guitarists for most of this year, and they are giving it glowing reports.
Here are some quick photos of one of the prototypes.
The preamplifier section is a multi-stage progressive distortion design, with several 12AX7 stages in cascade, alternatively biased hot and cold. An effects loop can be connected between the preamplifier and power amplifier sections, with an effects by-pass switch if not required.
The power amplifier section uses a 12AT7 voltage amplifier and an NPN transistor phase splitter driving the output stage. The output stage is push-pull using either EL34 or 6L6 tubes giving about 18 Watts RMS into 4, 8, or 16 Ohm speakers. Using a different type of output transformer it can also be configured as a parallel/single-ended output stage giving about 8 Watts of pure Class-A sound from two 6V6's. Presence and Depth controls tailor the feedback response around the output section.
The front panel has controls for Gain, Bass Midrange and Treble, Volume, Presence and Depth. This combination gives you a great ability to tailor the sound to your taste. The separate gain and volume controls allow you to adjust the amount of overdrive at any volume level.
There is a mute switch with it's own indicator light, and, for kitset safety, like the SE5 stereo amplifier, the power supply uses an external 12V 10A desktop power adaptor.
The rear panel has 6.5mm jack connections for the effects loop and speaker outputs, and an effects bypass switch.
Like other RedRoo amplifier designs, all components in Guitar Amplifier Kits are mounted on a PC Board so tricky point-to-point wiring is minimised. The front panel components (potentiometers etc.) can either be soldered-in, or plugged-in for ease of assembly and replacement.
RedRoo kits are top-of-the-range Guitar Amplifier Kits with professional grade components. We don't know the exact kit price yet, but it be very competitive. We also need to finalise the documentation and work out a name. (Everyone likes the name "Flying Turtle" so looks like its RedRoo's "Flying Turtle" amplifier. Same name as a sailing boat on Sydney Harbour but seems to have its origin in folk law*).
The kitset will be available soon, so, if you are interested or need any further information, please contact us. Keep watching this space.