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Welcome to the library of
information. Bookmark this page |
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This page is full of links that lead to
every information page on my web site. There is a ton of information below, take your time and read it all. Many questions can be answered by studying the information below. |
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| Click on a link below to navigate this page |
| This table is the index for all the info on this page. |
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| * Transformer wiring diagrams * |
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| Schematics |
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| Mods and Projects |
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| Scratch Building amps |
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| Hoffman board information and parts listings |
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| Helpful info items |
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| Technical and amp service information |
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| Servicing Fender amps |
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| Hoffman Amplifiers stuff |
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Sound Clips
page Sound clips and tunes of all types |
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Misc.
Sound setup and recording info Behringer FCB1010 - Guitar Rig - Windows mixer - Mixcraft |
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Drum Stik A free drum pattern and sequencer program I am working on. Help me test the program. |
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Other stuff I do - Too many hobbies, not
enough time Dallas one wire weather station X10 Home automation My veggie garden My home made CNC machines My Bikes Bike Lights and Mounts GPS stuff Recording music My amps and guitars |
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| How to print the diagrams on my web site on your printer |
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| Top of page |
| Windows printing tip |
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Any of the drawings or layout diagrams on
my web site can be downloaded into your
computer and printed on your printer. Method 1: Put your mouse cursor on top of an image and then right click your mouse. Choose the "save picture as" option. Save the drawing on your Desktop or in a folder where you can find it. Open the drawing with your favorite drawing program. I use Paint Shop Pro to open and edit the drawings. Method 2: Right click you mouse on top of an image, choose copy, then paste the image into your drawing program. How to print the images larger: In your drawing program, you can specify how you want your printer to print the drawing. Choose Landscape format and then Fit to page so the drawing fills out the entire width and length of the paper. I print the long drawings like the AB763 drawing on 8.5 x 14" legal size paper, but they still look good printed on 8.5" x 11" paper. |
| Links to technical and amp service information. |
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Lots and lots of helpful people can be found here. This is where you go to ask tube amp questions. Tube Amplifier help forum |
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Amplifier service technicians listing |
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Schematics and layout diagram page Everything from Acoustic to Wurlitzer |
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PDF tube amp books that you can download Right click on the links below and then choose "Save Target as" Save the PDF files to your computer where you can find them and then read them via Adobe acrobat Note that these are very large files. Radiotron designers handbook 3rd edition - 16 mb Radiotron designers handbook 4th edition - 25 mb |
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| Top of page |
| Hoffman Board information. |
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Hoffman boards are classic amp circuits
that have been re designed using my own
turret lug layouts. I didn't invent the
circuits, I just came up with a slick way to
organize the circuits on super neat turret
lug boards. Note: I don't sell Hoffman boards. I used to make them years ago and sell them. See the board manufacturers listing for people that are authorized to make my board designs. |
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| What is a Hoffman board? |
| Hoffman board manufacturers |
| Hoffman Board manufacturing instructions |
| Hoffman board installation Instructions |
| Choosing a chassis for a Hoffman board |
| Scratch building an amp |
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Sound clips of some of the amps below. Sound clips page |
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Note: The layout diagrams in this
section are my own designs. Look at this page for layout diagram hookup info. * Common Hookup info for my layout diagrams * Note: If there are items on the layout diagrams below that are confusing you, it's probably because you did not look at the page above. |
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Hoffman 5E3 Tweed Deluxe layout diagram Hoffman 5E3 Tweed Deluxe parts listing |
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Hoffman 6G15 stand alone reverb layout
diagram Hoffman 6G15 stand alone Reverb unit parts listing |
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Hoffman AC-30 layout diagram Hoffman AC30 parts listing |
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Hoffman AB763 layout diagram Hoffman AB763 parts listing |
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Hoffman 5F6A Tweed Bassman layout diagram Hoffman 5F6A Tweed Bassman parts listing Bassman reissue filter cap hookup document |
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Hoffman PLEXI 50 layout diagram Hoffman Plexi 50 parts listing Marshall 50 watt power supply diagram |
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Hoffman PLEXI 100 layout diagram Marshall 100 watt power supply diagram |
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Re-Vibe --
Reverb/Vibrato stand alone unit Origins of the Reverb/Vibrato unit Reverb/Vibrato photo page Reverb/Vibrato parts listing The original Re-Vibe had quite a bit of background hum. Original Reverb/Vibrato Schematic Original Hoffman style Reverb/Vibrato layout diagram |
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The Tore-T Re-Vibe mod Tore-T is a European gentleman that came up with a very cool mod that eliminates the hum that the original Re-Vibe had. I modded my personal Re-Vibe with the Tore-T mod and it is dead quiet. I would recommend building this version and not the original version. Tore-T visits my amp forum on a regular basis. Reverb/Vibrato layout diagram with Tore T mod Updated Tore T Reverb/Vibrato Schematic |
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| Top of page |
| Mods and Projects |
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These mods and projects are not supported
with any sort of tech support by me
personally. Some are projects that I have built for me personally or I built them to document a build process. In some cases you need to have major fabrication skills to build these projects. Please go to the Hoffman amp forum for technical questions. |
| Note: I don't recommend using relays to do switching unless you are an experienced builder. Relays and switches add extra wire and can add hum and other problems unless your layout is perfect. I prefer to hot wire the gain stages to keep wire lengths as short as possible. |
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| Sound Clips of the projects below |
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What is an 18 Watt Stout? If you take a stock Marshall 18 Watt circuit and add in another pre amp gain stage, you get a terrible monster amp that can go from clean to mean. I added a second gain stage and call my version of the 18 Watt, the 18 watt Stout. I also came up with a way to wedge reverb into to the Stout. |
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18 Watt Stout With and without gain switch The 18 watt Stout Pictures - with switch 18 Watt Stout - layout diagram with voltages - with switch 18 Watt Stout - schematic - with switch 18 Watt Stout - layout diagram - No switch, gain stage on full time. 18 watt Stout bare board picture - No switch 18 Watt Stout - schematic - No switch
18 Watt Stout - parts listing - with or
without switch/relay |
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18 Watt Reverb Stout Gain stage on full time, no switch
18 watt Stout with Reverb - Pictures |
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18 Watt Reverb Stout With relay to switch off Gain stage
The 18 watt Stout with Reverb - Pictures |
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Tube pre amp in a pedal
box Notes: This is not a
kit, it's a one of a kind personal project
that I created from scratch. |
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All tube Stereo guitar pre
amp project Notes: This is not a kit, it's a one of a kind personal project that I created from scratch. It requires major fabrication skills. I built this stereo pre amp to use with my Stereo effects unit. I now use it mainly for recording and it sounds great! Stereo pre amp project Stereo pre amp project- layout diagram Stereo pre amp project - schematic
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All tube Stereo guitar
power amp project Notes: This is not a kit, it's a one of a kind personal project that I created from scratch. It requires major fabrication skills. I built this stereo power amp to go along with the stereo pre amp above and my stereo effects unit. Stereo power amp project Stereo power amp project - schematic
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A Gibson GA-5 circuit
built into a Schedule 40 PVC electrical box The Schedule 40 GA-5 amp Schedule 40 schematic Original Gibson GA-5 schematic Craig Barnett created a board layout and parts listing for the Schedule 40 Schedule 40 Circuit board layout diagram by Craig Barnett Schedule 40 Parts listing by Craig Barnett |
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Hot switch Mod and relay
switching info Hot Switch Mod - add a gain stage to some of my boards and other amps. Add a relay to the Hot switch mod and relay switching info. Plexi 50 with Hot Switch Mod schematic Compare to a regular Hoffman plexi layout diagram to see the before. |
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Add reverb to the Western
electric circuit. Notes: The reverb mod works great. I used this circuit on my 30 watt Hoffman combo amps. Add Reverb to the western electric circuit. |
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| Bias current checker |
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| Wah Wah bypass switch mod |
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| Top of page |
| Servicing fender amps |
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This is just a general Fender amp
servicing guide. Many Fenders used the same
cicuit inside with just a few different
parts in the same spot on the board. You
don't need a special Deluxe Reverb service
Guide to be able to Service a Super Reverb
or a Pro reverb. STOP: Before doing any service work on an amplifier, you must make sure the amplifier is unplugged from the wall and the filter caps are drained. Filter caps can hold a charge that can give you a severe shock. The easiest way to drain your filter caps
is to warm up the amp and then play the amp.
Do not shut the amp off with the power switch
or the standby switch. Just unplug the amp
from the wall and keep strumming your guitar
until the sound dies away. Follow along with the instructions below by referring to the Super Reverb Layout diagram on this page. See this Windows diagram printing tip on how to print this diagram. |
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| Inside the amp - caps, resistors, etc. |
| Filter caps |
| Jacks, pots and tube sockets. |
| Power cord and fuses. |
| The heater system |
| Biasing the amp |
| Oddball amp noises |
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| Top of page |
| Transformer wiring diagrams |
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The links below lead to wiring diagrams for
the transformers I sell. Note: I do not sell Fender and Marshall transformers. Most are copies of older style transformers. |
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| Toroidal power transformer wiring diagram. |
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| Fender Style Transformer wiring Diagrams |
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| Marshall Style Transformer wiring Diagrams |
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| Discontinued Hoffman Transformers - wiring diagrams and info |
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| Top of page |
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