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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
HRO - Barry Williams edit / delete
Good article on the history of the receiver.
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
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
Dave Kimber's home page edit / delete
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
Includes a handy reference to tone control circuits.
to audio electronics retrotech tone valve ... on 16 May 2011
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tasty by Adam Sampson.