AB763 Amp ProjectBack to Library pageA junked out Deluxe Reverb carcass with a Hoffman AB763 one channel turret board installed |
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Note that Hoffman boards are not assembled by looking at my builds. I do test builds first and change the designs based on those builds. You assemble Hoffman boards using the documents listed below. The Layout Diagram, Schematic and BOM for this board are on this page |
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| The old Deluxe Reverb chassis I started with came out a pile of junked Fenders I purchased This amp only has the reverb channel and so there is an extra tube socket that is not being used. |
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| This was the first Hoffman AB763 board I made If you look at the transformer hole you can see it was hacked out by a caveman Someone had installed a very large Twin Reverb power transformer in the chassis I installed a 022798 Super Reverb power transformer I had to use some fender washers to get a grip on the over sized chassis hole |
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| Here's a good shot of how I ran the filter caps along the front edge of the amp I did not use a cap board and cap can. |
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| Another shot of the Hoffman AB763 board and filter caps |
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| Another shot of the Hoffman AB763 board and filter caps |
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| A front panel shot before I installed the custom face plate I added a dwell control to the reverb section and I am using a 3 spring 9AB3C1B reverb tank |
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| I sent the cabinet to Mojo to have it recovered. I made the 2 x 10 baffle board and installed some Jensen Speakers |
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| Front shot with the custom face plate |
| This used to be a 1966 Deluxe Reverb chassis. I purchased the chassis and cabinet as part of a large Fender junk pile deal. The chassis had a Twin Reverb power transformer in it when I bought it and it was pretty hacked up. The cabinet was bare wood. I made a new 2 x 10 baffle board because I like the sound of 10 inch speakers in Fender type amps. I installed a Hoffman AB763 reverb combo circuit board in the chassis. I added a dwell control to the reverb and it has the normal reverb mix control found on all Fender AB763 combo's. It has power tube tremolo, not opto tremolo. I deleted channel one from the AB763 circuit board. Who uses channel one? Then I moved all the controls to the left. The controls starting from the left are ( Volume, Dwell, Mix --- Treble, Mid, Bass, Speed, Intensity ) The baffle is a 2 x 10 speaker arrangement so this amp is now closer to a Vibrolux Reverb than a Deluxe reverb. It has a 022798 power transformer, which is the Super Reverb/Pro reverb power transformer so it has more power than a Vibrolux Reverb. It is Probably around 40 something watts. The output transformer is a Hoffman H50WO, that I had laying around so I decided to put it to good use. I have a rotary impedance selector on the back so I can use different cabinets or two cabinets at once. The filter caps are all inside along the front edge, there is no cap can. I am using EH6L6 power tubes and the amp sounds very good. I have also used EH6V6's in the amp but I needed more over head for the surf tune stuff I do. I had Mojo re-cover the cabinet and add grille cloth to the custom 2 x 10 baffle board. The speakers are new Jensen C10Q's. You can find more info on the Hoffman AB763 turret boards on this page You can hear this amp on this page. Sound clips page |
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