retro-thermionic

Retro thermionic audio harks back to the golden age of sound, utilizing vacuum tubes and thermionic valves to craft warm, rich tones. These analog components, reminiscent of mid-20th century technology, impart a distinct character to audio signals. Engineers embrace the harmonic saturation yielding vintage vibes sought after by audiophiles and music lovers. This process involves designing circuits with artistic and aesthetic intuition.

Friday, May 8, 2026

“Automony” - small signal preamplifier

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  Completed the cct. brds. thirty years ago and they have sat around until recently. There is no pcb but just a pad brd. There is no hookup ...
Friday, April 17, 2026

“Dadirri” - 71a power amp.

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  Every now and then you build an amp which stands out from all the other builds you have done in the past. Of the 71a amps I have built the...
Thursday, April 16, 2026

50W Class A Holton based power amp

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  For a long time friend, who already has two of my power amps, one SS and one tube, I was requested to build this Class A power amp. Holton...
Friday, January 30, 2026

“Immerse” - headphone amplifier using 5W chip amps.

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I had two 5W chip amps (TDA1905) in my collection for many years but did not need just another low wattage power amp to drive speakers. The ...
Thursday, January 15, 2026

“Five” - Pass inspired F5 Class A power amp with SMPS.

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  For some reason, still unknown, I had chronic hum issues with this build. I tried two different F5 cct. bds. and one Class AB module. Even...
Saturday, November 8, 2025

“Mimic Classic” - MM RIAA phono stage

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 As you will see by earlier posts I have made a number of these. While building the earlier couple I realised I still had parts on hand for ...
Wednesday, May 14, 2025

ArmaDillo - 600W Sure Class D power amp

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Complete apart from decal - all18kg of it. Two 600W 12A transformers, two 47,000uf Mundorf MLytic high current caps in a sturdy 3U enclosure...
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retro-thermionic
Fifty years+ in electronics with a passion for audio.
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