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Technical Blog

SPOTFIRE 35W Hybrid Stereo Amplifier

Here is a photo of the prototype SPOTFIRE hybrid stereo amplifier that started life in the rats-nest on the bench a couple of posts ago. It's in the final stages of design and needs some PCB changes and documentation, but it's an absolute hit performer. Here it is undergoing...
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Why 'SPOTFIRE' ...

For some time I've been searching my mind, unsuccessfully, for a new name for RedRoo tube amplifiers. Suddenly, out of nowhere, SpotFire came to mind, and to my surprise the business name, the trademark for that Class of goods, and the website domain were all available. ...
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A New Years Rats Nest

January 1, 2025

New P-P Amplifier for 2025

Electronics designers use many different prototyping methods. These days, it's very likely that a new design will never actually be prototyped but rather simulated using programs such as SPICE.For very simple circuits like tube amplifiers, I like the rats-nest method. It isn...
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The Red Roo Guitar Amplifier is Here.

The Red Roo Guitar Amplifier is now available for advanced purchase.Like all Red Roo amplifiers, it uses only top-quality components and is easy to build by anyone with a little electronic construction experience. It's a stand-alone "lunchbox" type amplifier so you will need...
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I've been playing around with the ARTA audio measurement software from https://artalabs.hr/ Although intended primarily for loudspeaker measurements, it does a very good job for tube amplifiers as well. I use this DAC https://focusrite.com/clarett-plusHere are...
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More Power!

June 15, 2023

How Far Can I Push My SE5?

People have asked us how far can they push their SE5 amplifier, power-wise. As it turns out, quite a long way. By connecting a full-wave voltage-doubler circuit to the AC output from the power supply, it's possible to achieve much higher HT voltages. Using an HT vo...
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Speaker Sensitivity, Amplifier Power, and Decibels

Here at RedRoo, we receive a lot of questions from people wondering how the SE5 amplifier will work with their small bookshelf speakers. That sounds like an easy question to generally answer YES, but, like anything in electronics, it depends on several factors:Speaker effici...
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The RedRoo Vinyl Preamp is now available, both as a full kitset or an information pack with PC boards for people who want to roll their own.I've had it playing for the last few months and it sounds great. This is a high-quality kitset which will rival preamplifiers many...
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Here is a photo of the new RedRoo Guitar Amplifier, without its protective cover. This is a top-shelf guitar amplifier with all the controls that a musician needs to create their own unique sound. The kitset is in the final stages and will be available soon.  For most o...
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Here are first pictures of our prototype RIAA pre-amp that we were showing at the recent StereoNET Hi-Fi show in Melbourne. The preamp has either two switched moving-magnet phono inputs, or one moving-magnet and one moving-coil when fitted with Lundahl LL9226 step-up transfo...
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