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Welcome to Rob Robinette's Tube Amplifier Website. I'm robrob on many amp forums and I freakin' love tube guitar amps.


How Tubes & Tube Amps Work  The non-electronic tech's guide to understanding electric guitars and tube amplifiers.

        How to Read Tube Amp Schematics It's easier than you think.

The Fender 5E3 Deluxe

    How the 5E3 Deluxe Works  My guide to understanding the classic 5E3 tube amplifier.

    5E3 Deluxe Modifications I detail the modifications I did to my homebuilt Fender 5E3 Deluxe clone.

    Deluxe Models  Fender's Deluxe amp went through many changes from 1946 to 2013, some major and some minor, but you won't find a bad sounding one in the bunch. See how the amp changed through the years with schematics shown for every model and how the changes affected tone.

    My 5E3 Deluxe Build  How I built my 5E3 Deluxe/Proluxe.

Fender AB763 Blackface

    How the AB763 Blackface Deluxe Reverb Works The layman's guide to understanding the classic blackface tube amp circuit.

    AB763 Blackface Modifications My favorite mods for the Fender blackface amps including the 65 DRRI & 68 CDR.

    AB763 Amp Model Differences What's the difference between a blackface Tremolux, Vibrolux and Super Reverb?

How the JCM800 Amp Works  Classic Marshall high gain amps are examined.

General Tube Amp Info

    Tube Guitar Amplifier Overdrive What goes on in a tube amplifier circuit when it's pushed into distortion.

    How to Voice an Amp Techniques for tweaking an amp's tone.

    How to Bias a Tube Amp Measure and adjust plate dissipation.

    Tube Bias Calculator  Let me do the math for you with this easy to use tube bias calculator. A 51 tube database means you don't have to look up your tube's dissipation rating.

    Android Tube Bias Calculator App  A free Android App for easy tube bias calculations.

    Tube Amplifier Troubleshooting  My technique for troubleshooting problem amps.

    5F6A Bassman Mods and Info  Lots of modifications and info on my favorite amp, the 5F6A tweed Bassman.

    Bassman Micro Amp The Bassman Micro tube guitar amplifier is a MajorValve designed compact practice amp that's moderately easy to build, uses three 12A*7 tubes and puts out 1 to 3 watts of output power. The Bassman Micro's single channel preamp circuit is the 5F6A Bassman's Bright Hi channel and the phase inverter is from the earlier 5E6A Bassman.

    Deluxe Micro Amp  The Deluxe Micro is another MajorValve designed compact amp which attempts to capture the magic 5E3 tweed Deluxe tube guitar amplifier tone in an easy to build, two tube, 1 watt output practice amp.

    Champ Micro Amp  A MajorValve designed Micro version of the simple but great sounding late 1950's Fender tweed 5F1 Champ. The full size Champ puts out 5 watts of power and as many people have figured out, that's too much for apartment dwellers or basement practitioners. The Champ Micro tube guitar amplifier is compact practice amp that's very easy to build, uses two 12A*7 tubes and puts out 0.75 watts of clean output power which drives a Weber 12A125A 12" Alnico speaker very well. The Champ Micro's single channel preamp circuit was inspired by the 5F1 Champ's Hi channel. The Champ Micro features two stages of gain and a dual triode parallel single-ended 12AU7 power tube from the proven Deluxe Micro.

    How Fender Input Jacks & Jumpering Work  Graduate school level discussion of the classic Bright - Normal - Hi - Low input circuit.

    Reverb & Tremolo  How they work and some layouts for add-on reverb and tremolo.

    My BootHillAmps.com  SixShooter amplifier build Very cool 2 watt practice amp with grid biased preamp.

    VHT Special 6 Ultra Mods  Several modifications for a very cool hand wired and easy to mod amp.

    Tube Amp Spice Analysis Use the free LTSpice program to simulate amp circuits to learn and tweak.

    Telecaster Mods  A few mods I did to my favorite guitar.

    The Trainwreck Pages  I really like Ken Fischer's article, The Trainwreck Pages, so I spent a crap load of time putting the original poor quality scanned PDF file through optical character recognition (OCR) and a bunch of editing to create high quality versions of his article. I created a web page, searchable PDF, Microsoft Word DOC and Open Office ODT files.

    B9A Prototype Board  Tube guitar amplifier layouts using the ValveWizard's B9A development board PCBs. The boards make for easy tube circuit prototyping and allow a modular mix-and-match approach to prototyping. It is easy to stitch together an amp using one B9A board with the Fender 5E3 Deluxe preamp with the 5F6A Bassman phase inverter and the Vox AC15 power amp.

If you are here to learn how tube amplifiers work I recommend you start with How Tube Amps Work, then read How the 5E3 Deluxe Works to see the differences between the super simple 5F1 Champ and the slightly more complex 5E3 Deluxe. Next read 5E3 Deluxe Modifications and Voicing an Amp to learn how changing components can affect the amp's tone.

WARNING

Amplifiers have large capacitors that store enough electricity to kill even when the amplifier is unplugged. If you open an amplifier you MUST verify it is unplugged and no voltage remains in the capacitors before working inside it.

MajorValve says watch yourself inside that amp (Some people call me MajorValve because I held the rank of Major in the Air Force).

Comments and corrections are always welcome at robinette at comcast dot net.


[ How Tube Amps Work ] [ How the 5E3 Deluxe Works ] [ 5E3 Deluxe Mods ] [ Deluxe Models ] [ Amp Troubleshooting ] [ 5F6A Bassman Mods and Info ] [ How the AB763 Deluxe Reverb Works ] [ AB763 Mods ] [ DRRI & 68 CDR Mods ] [ Tube Bias Calculator ] [ Overdrive ] [ Deluxe Micro Amp ] [ Bassman Micro Amp ] [ Champ Micro Amp ] [ Tube Amp Forum ] [ My 5E3 Build ] [ Reverb & Tremolo ] [ SixShooter ] [ Spice Analysis ] [ VHT Special 6 Ultra Mods ] [ Telecaster Mods ] [ Android Tube Bias Calculator App ] [ The Trainwreck Pages ] [ Fender Input Jacks ] [ B9A Prototype Board ]

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