Blues junior fixed bias mod, anyone know what resistor. I changed r52 with a 100k variable resistor i think a 50k would have done the job, but i had a 100k in my spare box el84 max pa is 12w. Fender blues junior manuals and user guides, amplifier. In the oldest blues jr s made before 1996 the tone is dark, the tone. When replacing output tubes, please note the specific tube. Pcb assembly chassis assembly cabinet assembly miscellaneous schematics service diagram fender musical instruments corp. Room4blues, fender blues junior settings zotemans blues junior settings for the fdp fender community youtube fender blues jr settings. My fender blues junior is from 2003 i think mim cream board so i use pages 2 and 3 of this document.
One of them lights up like its gonna blow up, and then i lose all base and tone. Only one i can find is for older green board and all component numbers are different. Most schematics i saw had the 10k ohm resistor as r48. In the course of selling and building amps i often get asked how my amps will compare to fender blues junior. It is aimed at achieving the warm, tubedriven tone common in many styles of american blues and blues rock dating back to the 1950s, while remaining both portable and affordable. Fender blues junior service manual download, schematics. On the other hand, while you are correct that the tubes are inverted, a good number of fender and other amps are arranged in the same way and, in the case of the blues junior, there is a tube retainer which holds them in place. Schematics and layout diagrams vintage fender amp repair. The blues junior is a good choice for someone trying to get their first tube amp but it not a professionals amp by any stretch. But the tubes are remote to not attached to the circuit board. Because of occasional irregularities in supply, the specific tube type used in each amplifier is subject to change without notice.
Fender tube amp schematics, hoffman amps tube amp schematic library. So, for me, wattage does matter as i have more range of volume and tone with the blues jr. The fat switch wiring layout is straight from hoffmans bj conversion. User manuals, guides and specifications for your fender blues junior amplifier. This mod fixes that to produce that lush classic reverb tone that made fender amps famous. I would conclude that octal conversion is essentially the same power since i cannot perceive any loudness increase from 4. The fender blues junior is like a smaller version of the famed hot rod deluxe and deville amps, right down to the cosmetics. The blues junior has become such a common commodity that holds a place as a moderately priced amp that everyone. Made for hard rock, bursting with gigfriendly features, this alltube amp is at home in the studio or onstage. Im about to start a new series of cancer treatments, but im told these will not be debilitating, unlike. For those of you that have changed the fixed bias resistor on your mim blues junior what resistor did you replace the stock one with.
Whether you need to speak to consumer relations or simply want to drop us a line, this is your source. The bigger cabinet makes the blues deluxe sound fuller but it is ear piercing at volumes over 1. I cutandpasted another tube section into the blues junior schematic. Blues junior top panel functions blues juniortm introduction the fender blues junior is a truly professional, small, tube amplifier. Database contains 4 fender blues junior manuals available for free online viewing or downloading in pdf. In the oldest blues jr s made before 1996 the tone is dark, the tone mod brightens up and adds more clean headroom to these first versions of the blues jr for a great improvement in tone. Fender guitar amplifier owners manuals current fender. Funciones del panel superior funciones del panel interior especificaciones top panel functions bottom panel functions specifications. We believe that this is the most complete, highest resolutio. Schematic for the original usabuilt blues junior amplifiers. Can anyone direct me to the best place to get help fixing my blues jr iii. Modifying a fender blues jr university of illinois. In this video i walk through the schematic of a fender blues junior tube amplifier. If you have a copy of an old fender guitar amplifier owners manual not shown in this archive, wed love to have a copy to post here.
Favorite blues junior settings fender stratocaster. Compact size, professional tone, and traditional styling make the fender blues junior ideal for rehearsal, backstage warmup, and. Hi like you can see, i have a problem with my blues junior this is my problem. Now comparing my board to schematics i was puzzled for a while. Fender blues junior modifications fromel electronics. Fits the fender hot rod deluxe, hot rod deville, blues deluxe, blues junior and blues deville, and 59 bassman reissue. The blues junior iv features the classic fender look of sparkling silver grille cloth, lightly aged to give it even more mojo. Need new blues junior schematic 103revc telecaster. What about the blues junior is so different from the vintage 50s and 60s fender designs that are so coveted and that so many of my amps are inspired by. Anyone having a copy to post, especially in pdf format, would be greatly appreciated. Pcb assembly chassis assembly cabinet assembly footswitch assembly miscellaneous schematics diagrams fender musical instruments corp. Fender blues junior amplifier and pedals demo youtube.
It sounds great right out of the box, and there are also many popular and fairly easy and some not so. Blues junior schematic and layout pdf newest version uploaded on. It features 15 watts of tube el84 power, and it has a single channel with basic eq as well as a fat switch which pumps up the midrange and gain a. Compact size, professional tone, and traditional styling make the fender blues junior ideal for rehearsal, backstage warmup, and studio work.
Note s texas blues ramon 4 2 5 10 11 in 3 blues 2 doug 4 5 5 7 6 in 3 roadhouse clean jesper hansen 4 7. Blues junior settings with ascending volume values description posted by rever b maste r middl e bas s trebl e fa t vol. The halftube connected by the colored lines is the unused half of v2, designated v2a. These are invaluable reference tools if you are digging around inside of your vintage fender amplifier. Plugging in, the clean tone was exactly what i was looking for. The included 1button footswitch is used to remotely activate the fat switch, boosting the midrange for pronounced tonal thickness when soloing. Fender blues junior iii schematic rev d the tube store. Hotrod deluxe prosonic protube revtwinvibrolux protube superconcert pro jr rumble bass customshop stage 112se. If you are converting a stock pro jr and are using the original pt, the rectifier and bias cicruint will be different than if you are building from scratch and using a 18 watt pt the layout and schematic in my pdf file will change its just a rough draft with notes added at the bottom heres links to the work in progress layout and bom pdf files. I need the current new c revision schematic for my new blues junior. Fender pro junior sch service manual download, schematics. Its laid out just like the schematic for the bassman, and its technically a dccoupled cathode follower.
Fender groove tubes your new blues junior iii amplifier comes equipped with the highest quality tubes available, sourced from various manufacturers. Picked it up for a song when a major australian music retailer went bust a while ago. A true classic, with that latenight blues tone found nowhere else but in a fender. It is disclosed solely for use by qualified technicians for purposes of equipment maintenance and service. I bought in vacation to new york a brand new, in the box, blues junior. Fender audio owners manuals current fender audio owners manuals archive this article contains a list of all fender guitar amplifier owners manuals currently available.
Blues junior lacquered tweed guitar amplifiers fender. The tmb tone stack is from robrobs website and deviates from the original bj design. Hot rod deluxe this is the model name for warranty claims. Like many guitarists, i am the proud owner of a fender blues junior amplifier. Schematics and layout diagrams here are hundreds of original fender schematics and layout diagrams, available for free viewing and download. Highlighted parts have been modified in some way for this project. It sounds great right out of the box, and there are also many popular and fairly easy and some not so easy modifications to improve the tone even more. The blues junior is a tube guitar amplifier introduced in 1990 by the fender musical instrument corporation. Ive used the fender blues junior owned by a friend probably the nicest, bestsounding of any of the smaller amps. Why a fender blues junior does not sound like a vintage. A powerful, roadworthy beast, the bassbreaker 45 delivers loads of. On first impressions at least, the fender blues junior iii is perfect. Stock blues jr is said to be 20 watts when measured in this same way. Jun 02, 2012 my fender blues junior is from 2003 i think mim cream board so i use pages 2 and 3 of this document.
A nofrills workingmans amp, the bassbreaker 1830 packs two amps into a single chassis for belllike clean tones and gloriously dirty crunch. Power sw, pilot lamp, reverb, master vol, mid, bass, treb, fat sw, vol, in. Hoffman amplifiers tube amp forum, hoffman fender blues junior. Im having some issues with the output tubes on my blues jr iii. Need new blues junior schematic 103revc telecaster guitar. In addition to the classic black tolex model, there have been several limited edition releases over the years as welloften equipped with different speakers or electronic mods to offer a unique spin on the original amp.
Super 112 super 210 93 super the twin tonemaster customshop vibrasonic customshop vibroking customshop vibrolux rev customshop. If the unit should suddenly stop working, take it to an authorized service center to have the. Thanks to my son andrews heroic efforts, we have cleaned up the backlog, and all but a few kits have been sent. Pack of 6 stainless steel back panel screws suitable for fender reissue tweed series amps. Fender forums view topic adjustable bias for blues. Celestion speakers are acclaimed worldwide for their distinctly rock n roll flavor, with a more modern sound and utterly classic roar when pushed. The fender blues junior is a truly professional, small, tube amplifier. Notices specifications theory of operation parts lists. In the unlikely event of an electrical fault, your blues junior iv amplifier is protected by an internal fuse. The cathode follower mod billm audio blues junior mods.
Favorite blues junior settings discussion in amp input normal or bright started by paulbiz, jun 15, 2010. Lacquered tweed takes fender s 15w gem and gives it the true vintage treatment with a lacquered tweed covering and a vintagevoiced 12 jensen speaker. And note, im not adding a sag resistor but wanted to dedicate space should i do so later. View and download fender blues junior iii service manual online. Fender amp heaven schematics tweed blackface brownface. Go with your ears but to me, fender amps sound better when theyre turned up. Fender blues junior iii service manual pdf download. Fender diagrams, schematics and service manuals download for free. Pcb assembly chassis assembly cabinet assembly miscellaneous schematicsservice diagram fender musical instruments corp.
Its golden tones are generated by an alltube signal path using a pair of el84 output tubes and 3 12ax7 preamp tubes. I have arranged to have my amp checked out by a local tech on friday after some recent changes and it would be helpful to be able to instruct him on what to use to change the amps bias. Jan 30, 2018 in this video i walk through the schematic of a fender blues junior tube amplifier. Its a nice little amp but many people on the interwebs complain that, stock, it sounds boxy and lacks bottom end. Fender frequently releases limited editions of the blues junior. Has the original fender speaker in it and 15 watts is more than enough for me. Service manual, operating instructions manual, service diagram, owners manual. Figure 1 is an annotated schematic of the fender blues junior. I analyze the circuit and compare it to other well known tube amps including recommendations for mods. Im using the same blues jr pt, an upgraded billm ot and a standard fender reverb driver from hoffman. The reverb on older blues jr s sounds horrible, this mod changes the reverb to the design of the newer blues jr s.
The information contained herein is confidential and proprietary to fender musical instruments corp. 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. Note s texas blues ramon 4 2 5 10 11 in 3 blues 2 doug 4 5 5 7 6 in 3 roadhouse clean jesper hansen 4 7 5 7 10 out 3 am. I recently purchased a fender blues junior amp and wanted to show how my pedals interacted with the amp. The input jack is at the top left of this schematic, and from. Your new fender amplifier comes equipped with the highest quality tubes available, sourced from various manufacturers worldwide. If your blues jr was made before 2001 the reverb sounds pretty bad.
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