Connect the raw switch to the free end of r9 and the empty r9 mounting pad. Bassman ab165 layout bassman ab165schematic bassman. Just a quick point here for information sake as that the 6g6 and 6g6a bassman also came with a single 12. Blackface bassman board layout aa165 w trainwreck chan. Fender heaven schematics shown in blue are missing from the archive. Is there any point in doing a blackface converting of silverface amps. The cab has a weber alnico blue pup 10 and a weber alnico silver dog 12. It is not a comprehensive catalogue containing all. Amplifiers especially tube amps contain high voltages that can kill. Fender had two versions of the blackface bassman head, the short lived aa864 and the ab165. Back then, tubes were much closer to the designed spec, but not usually sold as matched sets and fender certainly didnt buy them as such so a bias matching control was more useful. I had a tech put a mid knob where the ext speaker jack was. Warning if you are not a qualified technician please do not attempt any repair you are not confident with. Getting started all the files at schematic heaven are in adobe acrobat form.
I sent him my pdf of the layout but he is igorning me. These schematics cover almost every vintage fender amp and a few of the early silverface amps. Id draw it out, but i dont remember exactly how i do it. You can find the ab165 schematic including layout by following the link to the tube amps schematic library at the bottom of this page. It focuses on the early decision phases when looking at amps, for example on internet auctions. The tube amp library of information click the link above for tube amp info, schematics, board building information, projects, mods, transformer diagrams, photos, sound clips. Ab 165 provides a means for taxpayers to contribute funds to scholarship organizations in lieu of paying all or part of the excise tax currently mandated by the nevada department of taxation. Service manuals, schematics, eproms for electrical technicians. I could easily build a jtm45 from a layout but i dont have a. Fender users manuals, free download musical instruments, guitars. The ab165 bassman was designed with a biasbalance adjustment the first fender amp to use this system. Graph is from the excellent and free duncan tone stack calculator. Please take 30 seconds to register your free account to.
In any case, i will do my best to get a complete layout down within the next few days, permitting my free time. Are there detailed instructions anywhere i can use. Also some files are djvu so you need djvu viewer to open them. I started looking at your layout and comparing to the original schematic. The fender bassman is a bass amplifier introduced by fender during 1952. Nevada educational choice scholarship program ab 165. Relative merits of blackface and silverface bassman circuits. All of the designs are available for download in jpg and powerpoint. I recently acquired an ab165 and want to convert the bias to aa864 spec. Fender guitar and bass amplifier owners manuals and. Bassman allen mod or jtm45 type mods pics or layouts. Fender forums view topic 66 bassman aa165 or ab165.
Some of the eyelets that you think you want to use could be grounded from underneath by a hidden wire. If ordering for an older discontinued amp, please include photos or as much descriptive information on the product as you can. They have all been completely redrawn from whats available on the web. Providing tools allowing you to research pending legislation, stay informed with email alerts, content feeds, and share dynamic reports. This chart shows you how to read the color codes on resistors. Download the pdf here and download the diylc file here. Prowess amplifiers fender schematics bassman ab165 layout. Pin 1 is connected to the wrong side of that 100k resistor. Playing helpme in the style of sonny boy williamson ii.
However, the most noticable change in the ab165 was introducing a gain stage in the normal channel. Now strap on your technogeek helmets because im about to nerd out just picture me pushing my taped horned rims up on my nose as i say this to you but the bassman can be man different amps. The deluxe reverb schematic and layout below have been annotated with. Even when unplugged the capacitors can still contain a substantial charge and must be discharged before attempting any work. Prowess amplifiers fender schematics bassman ab165. In 1965 fender dropped the ab763 pro but added the aa165 pro reverb so the nonreverb pro is somewhat rare. Tone heaven i have found that the premier guitar article really boils it down well. Doing a bit of research, it could sound even better.
Prowess amplifiers offers resources for the guitar tube amplifier builder. Free fender diagrams, schematics, service manuals schematics. Ab165 ac568 bassman bassman 10 bassman 20 bassman 50 bassman 60 bassman 70 bassman 100 bassman 125. Schematics and layout diagrams here are hundreds of original fender schematics and layout diagrams, available for free viewing and download. Now, its easier to get matched sets, but tube performance is all over the place, so an overall bias adjustment is more useful. It is not a comprehensive catalogue containing all eras of fender amps that will guide you to a specific model. Theres a kindle version for 99 cents, and if you buy the paperback you get the kindle free. Prolly, modified from a ac568 i can see the added cathode ground strap on the 6l6gc.
Registered scholarship organizations list pdf overview. Disconnect one end of resistor r9 and bend it to one side. Panasonic dmreh50 repair service manual cd in pdf format. I came across your layout and schematic and it caught my attention for sure. In comparing to layout and schematic diagrams, i see unique elements of both circuits ie the 10k resistors connected to bias pot of the ab circuit look original and the rc network around the 12at7 from the aa circuit looks like some new resistors added or replaced. They are available for free download to help you with your amplifier repair and. Or feel free to post gut shots with explanations of your modded bass channel.
If you remove the death cap and free up the ground switch by removing existing wires to it if youre. Can anyone provide instructions over an ab165 layout of how to implement the bass channel preamp mods of this layout. Register now for our free onevote public service or gaits professional trial account and you can begin tracking this and other legislation, all driven by the realtime data of the legiscan api. Depending on when yours was made, this may help you determine for sure what you got, regardless of what the tube chart says as stated prior, they can be quite unreliable. The blackface ab165 and silverface aa270 have great tone as it is. Do you have a fender guitar or bass tube amp that needs repair or modifications. A step by step, note for note analysis of some of sonny boys signature riffs. Quick look seems that this amp has the ab165 circuit layout. Tube chart on mine is actually correct, but mine was made in last week of aug 66. We believe that this is the most complete, highest resolutio.
There is also a pdf with a list of the transformers and choke for each model. Type s, ss, cls, and clss nuts provide loadbearing threads in thin sheets with high pushout and torqueout resistance. To view the templates of offer scroll through the view box underneath to view the a5 booklet designs available. Fender diagrams, schematics and service manuals download for free.
We have a huge schematics inventory, projects section and forum. A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in. Rightclick to save the file or leftclick to open from your browser. I see the difference in the layout drawings, but want to be sure i am doing it correctly the 1st time.
To open downloaded files you need acrobat reader or similar pdf reader program. My ab165 is wired as a cross between a 5f6a and a jtm45. If it helps any, i have a 66 bassman and it is an ab165. Besides being a popular and important amplifier in its own right, the bassman also became the foundation on which.
Downloadable powerpoint and pdf design templates for a5 booklets. There is also the 6g6b model which has a blackface but is really brown or white in the nature of the circuit had a presence control, and had white barrel knobs so it is really not a part of the blackface family. It also includes samples of many of the resistors typically found in vintage fender amps. First there was the 5f6 notable mostly because it had a second gain stage basically a 25uf cap which you will see is deleted on the 5f6a layout. Tube amplifiers home schematics fender schematics bassman ab165 layout. Fender fm212 dsp service manual free download,schematics. I know stock the blackface circuits aa165, aa864, ab165 all sound great as is. The buyers guide to vintage fender amps is targeted for beginners with some or little experience with tube amps. These are invaluable reference tools if you are digging around inside of your vintage fender amplifier. What can we possibly draw from this knowledge with the ab165 and aa864. In fact, the ab165s bias scheme is poorly thoughtout anyway, and even if you. Fender audio repair service owner manuals and schematics on 1. Stuprint brings you a selection of great downloadable design templates that can be used for printing a5 booklets. I will check out that link and try to get something soon, schematic and completed layout based on ab165.
Here you will find our collection of fender schematics. I am going to be building a blackface bassman from scratch and as you know, there are so many directions to take. Also, has anyone dissected the allen mod to be able to provide instructions. V2 12ax7 2nd gain stage bass channel and normal channel for ab165. Aa864 tube layout seen from behind, v1 is to the right side. Look at the schematics and layouts so you can figure out what you are going to do.
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