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Removing and refitting the HRO dial.
to electronics hro radio retrotech ... on 25 June 2011
A decent overview of valve electronics, originally from the Maplin magazine.
to electronics etext retrotech valve ... on 25 June 2011
Andrew G6ALB - electronic stuff
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
Good article on the history of the receiver.
Virtually The National Valve Museum
Handy reference to valves, with datasheets, pinouts, etc.
to electronics retrotech valve ... on 04 June 2011
One design, using a generic pentode.
to electronics hro radio retrotech ... on 27 May 2011
Takes a bit of digging to find, but there are good radio restoration articles here on the R1155 and assorted Racal gear.
to electronics radio retrotech ... on 21 May 2011
Really good valve audio section -- how they work, what the actual differences between manufacturers are, and so on. Hilarious page on how to design audio equipment for audiophiles.
to audio electronics radio retrotech valve ... on 16 May 2011
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tasty by Adam Sampson.