The Spontaflex Reflex Web Page

"An idea of the ingenious reflex operation employed is given by the fact that the headphone output is taken from the same emitter that the aerial is applied to!" Some very cool 1960s transistor radio designs.

to electronics radio retrotech ... on 21 July 2005

12V Space Charge Tubes: A Junkbox Resource Guide

Low-voltage valve audio designs.

to audio electronics retrotech ... on 09 July 2005

Vacuum Tube Audio

Hifi valve designs, including the very simple "Darling" amplifier.

to audio electronics retrotech ... on 09 July 2005

Pete Millett's DIY Audio pages

Amplifier designs -- in particular, the HA-4 is a very neat headphone amp. Valve data sheet books as PDFs too.

to electronics retrotech ... on 09 July 2005

Fun With Tubes

I came here looking for the All-American 5 information, but there are lots of other valve-related articles here too.

to electronics retrotech ... on 06 July 2005

Optigan

Sort of like a Mellotron, but on a considerably smaller budget (transparent discs rather than tapes).

to electronics music retrotech ... on 16 May 2005

Mick's Audiworld Index Page

Another hifi collector.

to hifi retrotech vinyl ... on 09 May 2005

The Analog Dept.

Lots of stuff about turntables. Some of the home-made turntables are particularly neat.

to hifi retrotech vinyl ... on 08 May 2005

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