So along my journey of learning about tube amps, I've run across several resources that have helped me greatly, and even more that I haven't had time to dig into, but know exist. With the release of the Champlifier, I figured it'd be helpful to jot these down so people looking for tube specific information could have some places to start. Since tubes have been around much much much longer than I have :wink:, this is just a teeny tiny sampling of what's out there. If you find something cool, post it up. Often one reads about the dangers of high voltage, but not many tell you what the real threats are and how to stay safe. This is Colorado State University's High Voltage Safety Manual. It presents the dangers of working with high voltage and what you can do to keep yourself safe. http://euverc.colostate.edu/safetyte...ety_Manual.pdf Once upon a time, in a land far far away, tubes were common everyday items. Tube testers were in drug stores, and a youth could make a killing fixing old TVs and radios by replacing the dead tubes and re-selling them. During that time, much work was done to improve tubes and understand their behavior. Many classic tube texts are out of copyright, and as such are now in the public domain and can be distributed freely.
There is a plethora of classic texts which are out of copyright scanned and available for download here for free: Technical books online
The two books I see most recommended are the Radiotron Designers Handbook, 4th Edition (RDH4) and the RCA RC-30 Receiving Tube Manual.
RDH4: RDH4 mirror
RCA RC-30: Tube Data Most of those books above were printed 40+ years ago, and while tube technology hasn't done much since then, many people have presented much of the same information in their own (often more understandable) way. Others have broken down the tried and true techniques to help the DIY guy or musician build or repair his equipment.
R.G. Keen's GEO FX has several tube geared pages.
Guitar Amp Page: GEO's Guitar Amp Pages
Amp Debugging Page: Tube Amplifier Debugging Page
MOSFET Follies (snippets and ideas for using MOSFETs to replace tubes where it makes sense): http://www.geofex.com/Article_Folder...osfetfolly.htm
Randall Aiken has some very good technical information on his page. These often look at individual elements of an amp and the details of why they are done a particular way. He also has a bibliography of "must have" tube texts.
Tech Page: TechInfo_2
Merlin Blencowe has posted several "how to design" step-by-step pages on his site in addition to publishing a power supply and preamp design book. His presentation of the information is a nice addition to the classic tube texts.
Valve Wizard site: How to design valve guitar amplifiers
Richard Kuehnel has several calculators, part-by-part explanations of amps, and full on fundamental electronics tutorials available on his site in addition to his several tube related books.
Amp Books: Amp Books for Professional Builders
Kevin 'O Conner has published a series of books titled The Ultimate Tone
which are often referenced online.
London Power: Tube Amp Books - Tube Amp Kits, Tube Amp Books from London Power Now you've seen some pages, but want to read more "in the field" sort of stuff, or perhaps get some repair guidance, or see what other DIY guys are building, there are several amp focused forums that can help you out. I haven't frequented many of these, but they are referenced often so I present them for completeness.
Music Electronics Forum (reportedly the first music electronics page on the net, great resource for debugging a broken build or fundamental theory): http://www.music-electronics-forum.com/
AX84 (Tube amp projects focused on the 12AX7 and EL84 tubes): AX84.com - The Cooperative Tube Guitar Amp Project
Metro Amp (Forum focused more on Marshall style designs): MetroAmp.com Forum • Index page
18 Watt (Forum focused on Marshall style amps using the push-pull EL84 output stage): 18 Watt Community Center
The SE, PP, and 45 Watt family of forums: Cookie support required | Single-Ended Forums
, Cookie support required | Push-Pull Forums
, Cookie support required | JTM-45 / Bassman 5F6A You need tube amp parts? Ok, here we go: (I have used some of these retailers, and have only hear of others, I have no affiliation with any of them)
Antique Electronic Supply: Antique Electronic Supply LLC
Apex Jr: Apex Jr.Home Page
Hoffman Amps: Tube amp parts, Guitar Tube amplifier parts, Tube amp information
Mojo: Amp Parts, Cabinets, Guitar, Bass, Pickups, Pedals - Mojotone.com
Triode Electronics: Triode Electronics Home Page and World HQ
Watts Tube Audio: Watts Tube Audio ~ Everything Tube Amps!
Weber: Weber Speakers - Making the world a bit louder each day. And you need tubes for a tube amp right? (I have used some of these retailers, and have only hear of others, I have no affiliation with any of them)
Eurotubes: Eurotubes - Vacuum Tubes by JJ Electronic - ECC83, 12AX7, 6L6. 6L6GC, EL84, EL34, KT77, KT66, KT88
Groove Tubes: http://www.groovetubes.com/main.html
Ruby Tubes: Ruby Tubes
Tube Depot: Welcome to TubeDepot.com!
The Tube Store: www.thetubestore.com - Your online source for amplifier tubes! And last but not least, some sites are just handy:
Duncan's Tube Amp Page (Tube Data, Tone Stack Calculator, SPICE and Schematics): Duncan's Amp Pages
Schematic Heaven (Schematics for many common amps): Schematic Heaven. Where All Good Amp & Effect Designs Await Resurrection...
DIY Audio Forum (More Hi-Fi Related, but loads of good info):diyAudio