April 12, 2021

Free Download

Its been about three years since the initial design now, and quite a few RedRoo amps have been constructed in that time.  All the amps that I know about have been great performers and 100% trouble-free. I had the chance to do some tests and voltage measurements on some ...
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Chassis Kit

April 12, 2021

New Chassis Kit - Coming Soon

Making the chassis is usually the most expensive and difficult part of any electronics project. We have been experimenting with a chassis for this project which is made from 2.5mm thick fiberglass PC Board, with white silkscreen lettering over black. The front panel will be ...
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New post

April 12, 2021

Small Signal Relays - Alternatives

The RedRoo amplifier uses two signal-relays to switch between the two RCA inputs and the Bluetooth input. This avoids having to hand wire a conventional input selector switch, and terminate a lot of hand wired shielded cable.  Compared to larger power relays, signal rel...
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Circlotron Amplifier

June 25, 2019
For years I've been mucking around with valve amplifiers, much to the amusement of my family and friends. My first attempt was a version of what's called the Murray amplifier; a 20 watt per channel design by Australian Cyril Murray in the 1960's, which used 6CM5 television l...
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