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Schematic Heaven
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This site has the widest range of free guitar amp schematics on the net (but please feel free to re-educate me!).
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The Fender Amp Field Guide
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Just what it says it is. Includes layout & schematic drawings for dozens of models of Fender amps.
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Duncan's Amp Pages
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Tube amp info and some very handy (and free) tone control & power supply simulation software.
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Aiken Amplifcation
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Randall Aiken's "Tech Info" section is required reading for anyone even thinking about designing their own amps.
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Audio Xpress
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Skip the home page – go directly to these "Audio Classroom" articles on tube amp design. Not guitar-oriented, but essential basic info.
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Norman Koren
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"A resource for designing tube amplifiers with SPICE simulation." Still over my head, but maybe some day...
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Steve Bench
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Lots of good tube-specific articles, including the most in-depth explanation of loadlines that I've found.
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Tube CAD Journal
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Very hi-fi oriented, but has occasional articles on tube circuit basics.
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Antique Electronic Supply
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These guys used to specialize in antique radios, but they've seen the light and now carry lots of guitar amp parts, too. Not often the cheapest source, but they do have the lowest prices on the web for Accutronics reverb tanks.
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Angela Instruments
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Another well-stocked source for 'vintage' parts. Very competitive prices on many Hammond transformers.
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Apex Jr.
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"… in the surplus electronics business for over 25 years." The name that always comes up when people are looking for teflon-coated wire.
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Jenkins Sound Shop
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Primarily a cabinet builder, but they have good deals on cabinet hardware and the grille cloth I love (i.e., the background pattern for this site). Tell Doug I sent you…
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Kropotkin NOS Tubes
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Nothin' but tubes.
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Mojo Musical Supply
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Just about everything for tube guitar amps – components, hardware, you name it...
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Obsolete Electronics
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Nothin' but transformers.
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STF Electronics
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Good range of parts, as well as some kits.
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Triode Electronics
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Seems a little hi-fi oriented, but a good source for new tubes.
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Torres Engineering
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Guitar and amp parts and kits.
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The Tube Store
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The name gives it away, eh?
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Small Bear Electronics LLC
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Pedals, pedal kits, pedal parts (many of which are applicable to amps, too). Also some good how-to articles.
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Weber VST
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Manufacturer of excellent speakers. Also sells some parts.
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Vintage Speaker
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Another source for speakers.
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Jameco Electronics
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Not a huge selection, but a good source for 22ga 600V PVC-insulated hookup wire and prototyping components, as well as some tools. When they've got what I want, this is where I go when I want it tomorrow (they're one town over and I can pick up my parts on the way to work).
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Digi-Key
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A very fat catalog of components.
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Mouser Electronics
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Not as huge as Digi-Key, but they have most of the non-tube-specific parts you're likely to need, some useful "kits" (assortments of a range of values of a type of part) and the widest selection of eyelets I've found.
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McMaster-Carr
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Outrageously huge catalog of industrial supplies of all sorts. Great source for sheet metal, garolite, tools and even knobs for pots – always worth a search. Very fast delivery, in my experience…
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Newark
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Another of the big catalogs, but I don't have any experience with them.
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Ack Electronics
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These guys keep popping up as a recommendation from other amp builders, but I haven't bought from them, yet.
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