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Various radio restorations, including an *extremely* ratty HRO-5. This has a good shot of what the front panel's meant to look like on an unmodified HRO-5.
to electronics hro radio retrotech ... on 25 June 2011
HRO Dial Remove/Adjust edit / delete
Removing and refitting the HRO dial.
to electronics hro radio retrotech ... on 25 June 2011
Maplin Valve Articles edit / delete
A decent overview of valve electronics, originally from the Maplin magazine.
to electronics etext retrotech valve ... on 25 June 2011
Andrew G6ALB - electronic stuff edit / delete
Lots of simple valve projects, and an excellent page on voltage stabiliser valves.
to electronics radio retrotech valve ... on 04 June 2011
The "Mark III" WWII valve transmitter -- a fair match for an HRO -- and replacement HRO knobs.
to electronics hro markiii radio retrotech transmitter ... on 04 June 2011
gedasymbols: Stefan Salewski edit / delete
More sensible resistor and capacitor symbols for gschem.
to cad electronics gschem software ... on 04 June 2011
Virtually The National Valve Museum edit / delete
Handy reference to valves, with datasheets, pinouts, etc.
to electronics retrotech valve ... on 04 June 2011
HRO Product Detector edit / delete
One design, using a generic pentode.
to electronics hro radio retrotech ... on 27 May 2011
HRO dating and versions.
to electronics hro radio retrotech ... on 27 May 2011
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tasty by Adam Sampson.