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The Technophool page links checked 19 Apr 07
Some retro-tech articles on this site:1922 booklet on Armstrong's superregenerative radio circuit Thanks to Larry Fowkes
Schematic Links on theWeb:
Tech Info at Aiken
Amps (not just for guitar amps...)
Ampage Schematics (Guitar)
Altec vintage pro products, Ampex Audio manuals
Vintage tube amp schematics at AmpsLab
Andrea Ciuffoli - Audio
Audio schematics from Claudio Bonavolta
AX84 - the "open source" guitar amplifier
BAMA (Boat Anchor Manual Archive): Ham radio, test equipment - if it's busy, try the Mirror Site
Scott's Beitmans Site - "Beitman's Most Needed Diagrams", or download the full volumes here
Steve Bench has a site with some unorthodox circuits - now gone - here's a copy.
Blue Guitar - guess what?
had many audio projects and schematics - but you can still rummage...
Canadian Radios and Sams Dial Stringing Guide
Bob Casey's Old Radio Page
Cool Schematics - Guitar amps and effects
Dynaco (tube) schematics from Gary Kaufman
Unofficial Dynaco Page - the rest (I have an SCA-80Q and two pairs of A-25s)
Eico Audio Components - gone - try the Wayback Machine - schematics here
Fender Field guide - photos, info, many schematics
Firebottle audio schematics
The Free Information Society - Electronics
Glowbugs, more Glowbugs, a favorite glowbug (haven't built it yet...), one I DID build 35 years ago
Ham Radio manuals online, Military radio manuals online
More Ham Radio, CB, Russian tubes
Heathkit Circuit Archive- GONE... some still on the Wayback Machine but here it is revived!
A few more Heath manuals here
Test equipment and ham manuals at K04BB.com
Heath, Knight, Eico and more at Kit Central
Tube audio scematics at MachMat
Marantz schematics - from an ex-Marantz engineer (now gone!)
James A. Moorer has a Boatanchor Page (and the rest of his site is worth a look too!)
Norman Koren has written an interesting page on amplifier design
Fred Nachbauer "mad retro techie" is gone, but I am glad I knew him.
Rider's Perpetual Troubleshooting Manual at Nostalgia Air - 20 volumes of radio schematics!
Rider's PA Manual
Pacific TV has many Audio schematics
Early Philco schematics - from Mister Philco himself! More here... and I have a few myself...
Radiotechniek has many (more than 1200!) European schematics
Radiomuseum.org in Germany... auf Englisch bitte
Luca Rossi has 261 schematics on line... and counting! Parlate italiano?
Schematic Heaven - Guitar amplifiers
Schematic Page at Triode Electronics: Audio and guitar amplifiers
A few classic audio schematics from SDS Labs
You're at the right place for Stromberg Carlson schematics
Tech Library at One Electron - Audio, Radio, Test Equipment
Test Equipment and a few radio manuals at Nostalgia Air
DIY Valve Amplifier Gallery from Japan
Many Vintage Schematics, also from Japan.
Vintage Radio and Audio from Brian McAllister
Wade's Audio and Tube page
Wizard Labs has an good article on Safety and Reliability for Vintage amps
Zenith Transoceanic page at Nostalgia Air
Not Schematics but...
The EIA's Source Code Finder
Audio Basics newsletters from Van Alstine
Perhaps more than you'd like to know on transformer design from Patrick Turner
A few old transformer catalogs from Pat J. - are BACK at the Bunker of Doom!
More transformer catalogs from Pete Millett, and a few reference books too
Mmmm... Donuts! Plitron has several articles on toroid transformers for audio
Amateur Radio Technical links
Technical publications at AMFone.net
Tube-o-Rama from Ken Gilbert
Visit the Vintage HiFi museum
Project Gutenberg has reproduced the 1922 Radio Amateur's Handbook (and others - search on "radio")
Literature Archives at Pearl Hifi
Let's Talk Speakers! at Weber Speakers
Audio Classroom series at Audio Express (start at the bottom...)
Boatanchors - some serious links for those old SW and Ham clunkers...
Allied Electronics Databook from 1966 (see below for tube substitutions...)
"Uncle Technology" from Audiotools
A History of American Broadcasting
Vintage radio ads - check 1930 tube prices...
Audio manuals at HiFi Engine
Hi-Fi Literature - ads from '40s to '60s (and check "MAD looks at Hi-Fi")
Crystal Sets and One-Valve Radio competitions from Historical Radio Society of Australia
For more on crystal radios, stay tuned...
Philco radio, more Philco, Silvertone, Firestone Air Chief, Atwater Kent, Grebe, Detrola, Truetone, Zenith (30's...)
Midwest Radio, another Atwater Kent site, another... can't forget Crosley, Packard Bell... or the Zenith T/O
Classic audio: McIntosh, H.H. Scott, Marantz, Sansui, Pioneer, Sherwood, Soundcraftsmen, JBL/Altec, Fisher consoles
Vintage Technics, classic speakers, FM tuners, Dual turntables, Voice of Music, ElectroVoice, AR turntables
The Reel Deal is at Vintage Texas
Tektronix 'scopes, Hickock tube testers, the Tube Tester page, an hp Museum, the hp Archive, the hp Memory Project
Stereo Manuals and more
Jim McShane is THE expert on Harman Kardon Citation tube amplifiers
An amazing list of audio links from Steve Ekblad
Antique Radios - forum, articles, classifieds, links
Daniele has tube boxes you can print and a few radio publications
Find radio stations by location, call letters, or format at radio-locator - coverage maps too!
Retro Thing - vintage and retro-tech
Vacuum Tube Data:
Amperite current regulators 1,
(Thanks to John Stewart)
The Obsolete and Seldom Used list from the 1946 Sylvania data book
My list of similar and equivalent tubes with different bases
A list of tube introduction dates which might help in dating an old radio (Thanks to Ken Owens)
1928 Price list for RCA tubes (multiply x 10 for today's equivalent)
1945 Sylvania Aids to Wartime Servicing (tube substitutes)
1945 Sylvania Tube Characteristics booklet
1946 Clarostat Ballast tubes
1946 articles from Sylvania News (thanks to Bas Horneman):
VR Tubes 1, 2 Plate Ratings 1, 2 Grid Emission 1, 2 Filament Failure 1, 2
1953 Sylvania Tube Substitution booklet
1954 Sylvania Transmitting Tubes booklet
1963 RCA Industrial Nuvistors booklet
1969 RCA Industrial tube booklet
Vacuum Tube Data on the web:
tube substitution guide from GE
Another tube substitution list
A list of common radio tubes (1920's to '60s)
Industrial to RETMA tube number cross reference
Tube numbering systems and more...
From the Allied 1966 Electronics Databook - tube substitutions:
0A2-, 2ER5-, 3W4-,5DH8-, 6AT6-, 6BM5-, 6CU6-, 6GK5-, 6L5-, 7DJ8-, 11KV8-, 12CA5-, 17D4-, 35C5-
Foreign - American: 1H33-, D77-, EF812-, PM07-
and American - Foreign: 0A2-, 4ES8-, 6BD7-, 6EL7-, 8A8-, 16GK8-
Duncan Amps Tube data search, design software, schematics...
Tube Classics has data on European audio tubes
NJ7P Tube Search A LONG list of tubes with basic data, pinouts, substitutes...
Pete Millett's HB-3 Over a thousand RCA data sheets - more tube manuals too
Frank Philipse Electron Tube pages - over 20,000 tube numbers!
Nostalgia Air Tube Substitutions
Gary's Tube Page Audio, Dynaco Archive
Audiomatica (maker of SOFIA tube tester) - measured curves for many tubes
VT52 - check under "Downloads"
Roehrentabellen (German for "Tube Tables") - in English too
DrTube Audio tube data
Amperex 1963 condensed catalog
1933 RCA tube manual (8 MB pdf file), 1937 RCA tube manual (15 MB pdf)
WPS Tube catalogs
Sylvania 1943, 1949 and 1959, RCA RC-25 (1966) and TT-3 and TT-4 - all at the Bunker of Doom
Mike's Electric Stuff - Nixies, many REALLY weird tubes
JMH's Virtual Tube Museum ...more unusual tubes
UK National Valve Musem ...basic data for many tubes
Ake Holm's Tube Data - many tubes including Magic Eye Tubes
More on Tuning Eye Tubes... (in German, it's "Magishe Augen") ...and even more...
Nextube has Russian tube data and a list of US equivalents.
More equivalents, Russian and Chinese
More on Russian tubes in German, though... translate with Google or Babelfish
Tom Schlangen couldn't find some tube data he wanted, so he measured them - here are a few more...
12V "Space charge" tubes
EIA manufacturer codes, Philips Codes, Telefunken Date codes, even more date codes
Data on grounded plate operation of 6AU6 - thanks to Ray Moth
Tube manufacturers / sellers (with data online)
Svetlana US is GONE but check the Wayback Machine - Tube
Eimac Transmitting Tubes
FAQ list - commonly used tubes from Vacuum Tube Valley.. and Eye Tubes
MachMat Tube data sheets
IGA Valves has this reference page - Russian tubes and more
Ask Jan First has Infozone - including this neon glow lamp manual
Dons Bulbs has a Bulb Data Library
Tube Tidbits from Vacuum Tubes Inc.
Vintage Components, in the UK
Vintage Tube Services has started a history of tube makers
For Western Electric tube data, go to the source...
Amperite still makes ballast tubes and time delay relays
Retrovox (Australia) has some interesting data
Richardson Electronics has data sheets for SOME of the tubes that they stock...
Russian tube data at GSTube.com
Triode Electronics Tube data page
Ned's new site has Tube data too...
House of Tubes online store has a few tube manuals - GONE!
Nixie tube data at Sphere
Audio forum... another
... Ok, just one
Affordable Audio webzine, and Bas Hornman's DIY Audio Magazine
The title sez it all... Odd Toobs
The Hollow State Newsletter
Now THIS is a power tube!
The Museum of RetroTechnology
High-speed photography at Liquid Sculpture
Where's Waldo? At the Silicon Zoo!
This is Patently Silly
The future isn't what it used to be...
Technofossils! OK, historic scientific apparatus...
The Evil Mad Scentist's laboratory and the Steampunk Workshop
How to make... stuff at Instructables and Hacked Gadgets... or maybe you'd rather take it apart...
Japanese Design Database... Wow!
"Spread Spectrum" radio stems from this 1941 patent. You may have heard of the Inventor...
Arthur C.Clarke proposed communications satellites in geostationary orbit in 1945
As for inventors, Edwin H. Armstrong rates right up there... his 1936 paper on FM radio
Remember Popular Electronics Magazine? You'll remember Don Lancaster!
Dave's Homemade Radios - more homemade radios at Sparkbench
Now HERE is a radio collection - Radiotiques
And Radiola Guy !
Bob Pease is Staff Scientist at National Semi. His columns in Electronic Design are great!
Vacuum Tube page from Elizabeth Tuttle
D. W. Grimwood's Electron Tube page
Take a look at the radio collection of Deco Dan, and here's another interesting collection
From Lebanon - Mid Century Radios
The Valve Page
A collection of Radio Direction Finders
The web page of... Philco Grump
And heeere's Triode Guy!
Thermionic madness at Tubelab
A page devoted to the Knight-Kit Wireless Broacaster
Broadcasting From the Home! at SMECC
Homemade vacuum tubes and semiconductors, among other experiments...
More DIY devices - Instruments of Amplification
More things that glow: Neon University, Kilokat's Antique Light Bulbs, Xenon flash tubes
OK, I admit it, it is the 21st century... so here's the LED museum!
Before there was a 555 timer... there was the lowly neon bulb...
The transistor is now over 50 years old - history at Mister Transistor and the Transistor Museum.
Obsolete calculators, computers, semiconductors... at Decode Systems
Transistor radios at Childhood Radios
and then, of course, you'll need Proximity fuzes
Build your own laser - or a basement nuke
DON'T try this at home (but if you do, I want to watch...) Teslamania!
Fun With Tubes - just what it says....
High Voltage, lasers, other fun stuff - The Gadget FAQ from Sam Goldwasser
MORE stuff you shouldn't do at home (but SOMEBODY did...)
The Tube Lust page at Enjoy the Music
World Tube Audio Portal - links to everywhere
Tone Lizard's Lounge
A site dedicated to my favorite science fiction writer, Robert A. Heinlein
Was Ghost Riders in the Sky the greatest song ever written? Or was it one of these?
Boozhound Labs ... well, hard to explain...
Doctor Gizmo has left the planet...
What to do with those useless TV Tubes...
All you geetar pickers need one of these here geetar tunas...
Data sheets for the Belchfire 6000SUX, the Umac 606, and Signetics Write-Only-Memory 1, 2
Light emitting Vegetables ... and Kimchee
Pay attention, because It's the Law!
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