Blues jr output transformer. Upgrading a Blues Jr.

Blues jr output transformer Price Drop. The OT-18 by SourSound. though I am in no rush. Jun 11, 2008 #2 ; B. Here's a schem. They upgrade with Hammond transformers, but with a different model to the ones you mentioned. Show More. 8kΩ primary, 4 & 8 Ω taps — **larger than stock OT. and was wondering how to hook it up to a cab. Tube Board PCB USA Shipping. jr. 8kΩ primary, 4, 8 & 16 Ohm taps — ** larger than stock OT. The output transformer is undersized to a fault. Fender Blues Jr 1x12 Mod: Standard, Deluxe, Platinum Mods & Upgrades . which is Primary: 8k, Secondary 8 ohm, and is described as being bigger than stock (obvs than the 5e3 stock and not B Jr) Last edited: Jan 31, 2019. Watchers:3. | Output Transformer. Cosmetically perfect. 25. Used – Fair. tinkerers on this board attempted to replace the OPT? The Heyboer model that Billm recommends is available for pretty cheap out there on the interwebs, but I'm wondering if it's easy enough to do without "adult supervision" (i. Which then makes me think the shortest (and probably cheapest) path is to sell the Blues Jr & buy a Blues Deluxe or Blues Deville. 0022uF caps C1 and C16 long gone via a previous Fromel/Bill M mod. 1) I've got an old Classic Tone 40-18027 Power transformer laying around from a previous But they output a B+ as much as 150v higher than your Blues Jr, which means you need to also rework the power supply (filter cap values/arrangement) to make them work. output transformer will sound OK in this set up. Works great and I consider it to be a slight upgrade from the stock transformer. Replaced those. The power transformer is smaller than the power transformer for a 5F1 Champ, the output transformer is also very small. EL84 to 6L6 tube mod. The best way to ascertain if you have an intermittent output tube is to run the amp for a while sans output tubes. This U. Where a standard Pro Junior transformer is theoretically designed for a 15-watt amp, a Switching the Blues Jr. Many thanks, hadn't spotted that, they use the 1750H 6. Please login or register. III with the “Sparkle Mod” you won’t have a cap at C9. Also replaced the output transformer with the larger Hammond 1750H (built for Deluxe w/ 6V6) and added a Presence pot: 100K, audio taper with 56K resistor in series with the low-resistance side. 8kΩ primary, 8 Ohm Secondary –larger than stock OT — 3 9/16″ c-c –new mounting hole must be drilled! Mercury offers Transformer Restoration Services for rare and vintage transformers that are failing or underperforming. , including the boxy sound (it has a nearly cubical cab, acoustically quite Best guitar amplifier power transformers, output transformers and chokes. The output transformer only has an 8 ohm tap (to the best of my knowledge) and the internal speaker is 8 ohms. All I really need as far as the guts are concerned are the output and power transformers (Product ID's #041781 (output) and #041782 (power)). Description/Specs: Includes Standard Mod™ (see above) Includes Upgraded Voodoo-Designed™ VA-BJR-OS Output Transformer ; $209. Jan 31, 2019 #20 Hoffman Amplifiers Tube Amp Forum, Blues Junior output transformer specs. Choke. Get Fast Delivery and Discover More from Mojotone at Opentip. Works in 15 watt amp circuits using with a pair of EL84. Upgrade: stacking is 1" Impedance ca. were kept as close as possible to the original part to preserve the stock “tone”. Chances are that this is already covered in a previous thread, but I need to share this experience I'm currently repairing a Blues Jr III. Fender | Blues Jr. Output Transformer - 4, 8, 16 Ohms. $98. From the Master Volume to the speaker it's all Blues Junior. 063x7/16 blk (@ reverb cable) 1 026038 bushing sr. 7k p-p . 4 Ohm yellow. Here's a gut shot Tubes are now chassis mounted. MIM 90s tube socket board. This piece of gear has sold. Home; Help; Search; Login; Register; Hoffman Amplifiers Tube Amplifier blues jr. or 15 watt EL84 amplifier with an 8ohm output. Jan 5, 2019 #11 or completely different winding on the transformer. Add to cart. III Versions offering 4, 8 ohm Taps. 14-Day On the schematic it’s shows that I should have on the output transformer on its primaries 29. /Pro Jr Output Transformer (Stock) Used – Mint. Instructions for output transformer install are in the box. Rusting could be a problem in wet climes. This PT increases the B+ voltage for use of EL34, 6L6, 6V6. Ohms Law gives you current I = V/R easy cheezy. Add to Wishlist View Wishlist. and Princeton Reverb amps, and also suitable for dual EL-84 amps with an 8 ohm If you look at the photo below there are two ribbons that connect the output tube pins to the main board. I've replaced the transformer and installed new output tubes. Black Tolex with silver cloth. 6k, I had a blues jr with the TO20 side by side with this one and it actually had more distortion, I think the 8k load keeps Hello, I have a Fender Blues Jr American, I am thinking of making a modification, change the source and the output transformer by one of a 30W, swap the sockets and put valves 6L6 JJ Tesla, so that has more headroom, Blues Jr. e. Bolt hole spacing is 3 9/16″, new mounting After removing the parts that where going to replaced I put in the new quality F+T filter-caps. I am an amp tech running into a problem I'v never seen before. B+ Red. Welcome To the Hoffman Amplifiers Forum April 25, 2025, 06:15:29 am: Welcome, Guest. I was looking at the back of the Blues Jr. Regular price $52. For twenty years I played through the Blues Deluxe that I Hey, guys. I don't understand why any boutique builder would offer upgrades, they should be offering the best amp possible to start with !! I build and sell amps and carry out repairs, i've blind tested 5E3's (15 or 16 people, can't find the results at the moment) with Mercury mag, Hammond and Dagnell, there was no definitive number of people prefering one tranny set over another. I have a Blues Junior on the bench today and as you turn the volume above 2 or so it creates a sudden, awful distortion that overpowers any other sound. Re: Changed Output Transformer in a Blues Jr -Need Help! « Reply #5 on: April 27, 2022, 03:01:48 pm » You possibly damaged one or more solder pad/traces removing those resistors or broke one or more jumper/ribbon cables by The first major cause of a fuse blowing is an output tube that shorts. 5V 125SE Series Single Ended Tube Output Transformers; 1627-1642 Series Single Ended HiFi Output Transformer; General Replacement 125J series 8watt Push Pull Tube Output ; The Blues Jr. There were several other things I didn't like about the Blues Jr. I liked it, but I had some residual doubts about whether a Blues Junior would have been better for me. Pre-amp and Reverb is a mish-mash of vintage Fender circuits. 2) Upgraded Power Supply Caps-100uF 450V F&T-22uF Fender Blues Jr Power and Output Transformer 2020. The Power Transformer (PT) takes wall voltage of 115VAC and transforms it into a very high voltage tap, a low volt heater supply 6. I am going to get after it again in a couple days but just thought I would ask if anyone else has seen the problem. Reverb has your back if your item is lost, damaged, or doesn't match its description. I might give that a go Upgrade Power Transformer for the Fender Blues Jr. If you remove the output valves, the HT will be wrong as will the 15v rail, because the secondaries of the mains transformer will be high in turn making the -ve bias incorrect with EL84s fitted. USA, Made In Mexico and Blues Jr. $20. You might also want to search out aftermarket transformers for a Deluxe. Pacific Transformer Fender Blackface Champ/Vibro-Champ Output Transformer 2022. 3VAC and can other secondary outputs as well. I do know that the 6L6s are going to need a higher output transformer from the Billm site but I need to do some more investigation to see if the Power transformer also Output Transformer 049969 Push-Pull for Blues Junior Pri: 6950 Ohm / CT Sec: 4, 8, 16 Ohm Power: 15 Watt Files: Datasheet. Adding another cab in addition to the internal I also put in the Billm 22 watt Output Transformer which automatically switches the amp from 8 ohm to 4 ohm when you plug into the provided aux jack. board. Output Transformer 0049969000 OT Amp at the best online prices at eBay! Free shipping for many products! Genuine Fender Blues Junior Output Transformer 0049969000. Direct Replacement Fender 49969; For Blues Junior model; Technical characteristics: Frequency response: 70Hz - 15KHz; Input impedance: 6950 Ohm; Output impedance: 4, 8 and 16 Ohms. Up for consideration is a Fender Blues Jr upgrade package. The Blues Jr transformer is 240V at 125ma with no center tap. Pro Junior used I wondered if I had made the right choice. 00. Have any Blues Jr. -User Name-Password. Browse: Find many great new & used options and get the best deals for Genuine Fender Blues Junior Jr. I will change that last resistor tomorrow, and briefly put the tubes all in and see if the B+ goes up even with a load. Between a ground and the brown wire I get none but between ground in the blue wire I get anywhere between 700 and 2000 VAC ( after the tubes warm up). Home > Transformer Upgrades > blues jr > Page 1 of 1. Peavey | Classic 30 | Power Transformer. View similar gear. Sometimes the tube can remain shorted, and other times, once a replacement fuse is installed, the bad tube can begin working, only to fail again at some point. 500x. This website uses cookies to ensure that you get the best experience. Information about the manufacturer. Price $60 + $15 Shipping. I think it might be nice to get a rounder sound out of the Blues Jr. Long story short, I said **** it and replaced the original OT with the DC OT. Listed:2 years ago. 5v on the grids. MAINS transformer for: Fender® Blues Junior, also for Blues Junior III   Upgrade for Fender Pro Junior Amp (004-1783-000)   NEW: Re: How to measure bias in a Blues Jr? « Reply #10 on: March 04, 2023, 03:49:23 pm » You could easily add a small tag terminal to Doug’s BJ tube socket replacement board for mounting the other lead of 1R bias sensing resistors from the cathode pins. N. Also I replaced the resistor in the voltage devider with a 24k ohm to cool the bias. . From your previous post, I believe yours have been sorted out. I have found a few sites that either sell used transformers or brand new transformers for insane amts of money. III Versions. Drop in upgrade output transformer for your Blues Jr. Good for 15 watts from a pair of EL84/6BQ5, 6V6GT, etc. uses a steel frame to mount all the components. I purchased an output transformer from I recently picked up a Blues Jr 3 for a really great price. from the supplied 230V to the required 240V is a good thing to do here on this septic isle. *, 15 Watts Physically, parts were designed to look similar to original factory units (where possible). Wherever possible, these transformers use parts and designs similar to original factory units to preserve When installing a new/different output transformer there is a 50/50 chance the wires will be in the squealing configuration. I plan to replace the power transformer to change the bias voltage. Billm RIP. 8 Ohm green. (@ v4,5) 018022 bushing snap 5/16x17/32 blk (@ output transformer) 026116 bushing sr . Reverb Buyer Protection. Try contacting Rat Amps in the UK. The main 47uF filter-cap is doubled in value to 100uF which along with the bigger output transformer helps to give the amp a bigger Dave Smith at The Guitar Shop in Richardson (DaBeck Amps) sold me some new, higher value filter caps (350's instead of 300's, 100 mf on the 450 instead of 2/11 Blues Jr. More Information. Far more than tubes, speakers or other amp components, the transformers establish the platform for shaping your amp’s sound. c. Fender Project Reverb Style Push Pull 15W Output Transformer - APD-8045A-H. Watch this gear and we'll notify you if it becomes available again. with higher rated plate voltage EL84s for a short period of time. That difference is large enough to possibly cause damage I am beginning to think it might be the speaker or the Output transformer. Herstellerinformationen | Manufacturer Information Hammond Manufacturing Co. Welcome, one and all, to the latest edition of Fix It Friday. I have replaced the filter caps with F&T caps and replaced the 1n4006 diodes with 1n4007. Bryan Sours custom designed this transformer to my specs and the results are astounding. The first thing that amazed me was how small the transformer set is. The back of the Blues Jr covers the area where you plug in the speakers and footswitch so I gently pulld back the tolex and trimmed the back for easy reach to the jacks then reglued everything Heyboer Transformers, Mercury Magnetic Transformers, Jupiter Condenser, F&T Caps, Tubes, Sitches, Jacks, Wire and all kinds of Amp Parts available online from amppartsdirect. FIF : Blues Junior Power Transformer Swap. In either case, they give your Blues Junior an authoritative sound that you won’t believe. 062x37/64blk (@ power cable) 1 049103 cab assy blues jr tweed (complete cabinet) 1 049103020 back assy blues jr tweed (backboard) 1 038566 cable assy spkr rt ang 13-1/2 (speaker cable) Cookies & Privacy. They're supplied 230V, many of us have wall voltages of > 240V Apparently some amps have international transformers and can just be rewired whereas mine and most later Blues Juniors sold in America are 110v only which is why I I have seen one of the largest mods for blues jr's is to replace the output transormer, the TO20 that everyone puts in is nothing more than a small deluxe reverb transformer. The output transformer doesn’t seem to be bad at all anymore now that the blown screen resistor was EDIT: Unless there is a viable mod to remove the MV from the Blues Jr. 290XEX Fender Blues Junior Power Transformer 15Watt 240V 50Hz 330V - 6. Standard push-pull primary with three wires; red center tap, brown and blue I've spent Sunday modifying a Blues Junior. Thread starter mcentee2; Start date Jan 28, 2019; This site may earn a commission from merchant affiliate links like Ebay, Amazon, and others. Bolt hole spacing is 3 9/16″, new mounting hole needs to be drilled $ 208. Custom Fender Blues Jr. I know these amps are biased way too hot and this is the cause of all problems. Key components in the Fender Blues Jr schematic include the power transformer, output transformer, Features Fender Blues Jr. Originally $30, now $22 (27% price drop) $30. I'm doing the Hoffman Amps point to point conversion of the Blues Jr. More than ample to cool the output valves down a bit. The output transformer is minuscule in this amp, it’s easily smaller than a Champ output transformer by a reasonable margin. Power: 15Watt Replacement for Fender part number 049969. $22. Standard push-pull primary with three wires; red center tap, brown and blue plate leads. (Heyboer-made) output transformer is an upgrade from the original and our tests confirmed a noticeable improvement in the tone of the amp after replacing the original output transformer in Replacement for Fender part number 049969. New Handwired board, New Output Transformer . 6k primary but larger. Upgrading a Blues Jr. The blue wire that is running across the 2 ribbons on the left is the connection from the output transformer primary to the plate of V4. which means they lowered the primary Z to 6. Views:75. OT is 7K:8. 2 018022 bushing snap 5/16x17/32 blk (@ output transformer) 1 026116 bushing sr . Mercury Magnetics FPROJR-O Pro Jr. The transformer is an upgrade version ,designed specially to withstand extreme working conditions and heat loads /current overloads typical in guitar amplifiers. The TO20 is a direct replacement for Blues Jr. Jan 6, 2019 #19 Shop Blues Jr. Also, a few seconds after powering on it begins to emit a louder than usual hum. detailed instructions). tube socket 9 pin pcb mount xv1-5 014689 xstr n-ch jfet j111 to-92 chassis assembly part # description reference designation 049307 chs assy blues junior 120v (comlete chassis) 047560 bracket tube retainer pro. For example, my personal favorite Sony MDR7506 Professional Large Diaphragm Headphone has an impedance of 63 Ohms while the Blues Jr output transformer typical outputs 8 Ohms. Celestion Greenback = I think these are around $100. 8 ohm secondary. Plugging headphones into a tube amp most likely will damage the output transformer and the power tubes. Transformer Upgrades. Part No. i have the blues jr. The 0. So after reading up on how everyone loves the simple Blues Junior Output Transformer. Measures Hey all, The circuit board for my Blues Jr's tubes recently burnt out and when I searched this up it said that apparently this is quite a common problem so I am planning on trying my hand at repairing it myself and have bought a new board. Joined Apr 17, 2015 Press the wires from the output transformer as far away from the board and as close to the chassis as possible. Install the . I aim for 11. I have several other mods in mind - reverb improvement - transformer upgrade - speaker upgrade. 00 Installation fee (included) The OT was freakishly tiny! The original one was about the size of the replacement models that I put on 20 watt Blues Jr's. came in, oscillating. I put a Hammond transformer in my tweed BJ 3 nos to convert it from 110 to 240v. (USA, MIM and III versions) and they work exceptionally well to put the final touches on an amp with our Best guitar amplifier power transformers, output transformers and chokes. Output Transformer quantity. Transformers and capacitor upgrade, and a couple mods. Spec Sheet. On the Blues Junior schematic (attached), the '240V WIRING' for the power transformer shows 7 connections, while my transformer has two, white ('0') and black ('240V'), just as the '120V WIRING' diagram on the schematic. Reason was, the three 22uF capacitors were all leaking their guts out. Primary: A1 Brown. Used the BJ power and output transformers. The power and output transformers were mounted too close (or in the wrong orientation) to each other, and the power transformer appeared to be inducing hum directly into the output transformer. UPGRADE: OUTPUT TRANSFORMER for Fender Blues Junior, Hot Rod Series, 15W, 4, 8 + 16 Ohms. I have found in the past that smaller output transformers have less bass response than the larger transformers If you search the web for Pro Junior/Blues Junior replacement output transformers, you’ll certainly find a few with the additional 4-ohm tap, but you don’t have to stop there. I've done several Billm Output power is up around 20 watts and the amp takes on a wonderful roundness with a brighter, glassier top end than you can get with EL84s. I like to see EL84's in Blues Jr running 26 to 29 milliamps, just barely past the Output transformers marked "upgrade" allow for greater versatility by adding secondary connections that did not exist on the original units. Unless you've got $300 to spare for a new set of output transformers. I can't see one on the Hoffman site and unsure about the Allen Amps TO26 I've got the stock power transformer and an Allen T020MT output transformer. Ltd. Guelph, Ontario Canada N1H 1E5 Fender | Blues Jr. The two main transformers in an amp are the power and output transformers. 063x7/16 blk page 6: cabinet assembly I am currently gathering up all the needed parts to build a Fender Pro Jr. Hammond 1760F direct replacement for Fender Blues Junior but upgraded with 4,8 & 16 ohms secundary. More Information My amp is a 1998 Blues Jr green board. amp and I'm also upgrading the transformers at the same time. P-CLASS30-P. 6V - 20. I've got a few questions on the build that I thought I'd put out there. S. See a video of this amp in action on the British Custom 7 Page . Tubes: 12AX7, EL-84. Written by Logan Tabor. It's slightly Drops right into Fender Blues Jr, Pro Junior, Princetons, and old Gibson Amps. 27% price drop. mcabe Tele-Meister. Despite the improvements in IV, there are still problems that exist. LTD in brown tolex, i the Allen TO26 has 3-1/8" mounting centers, the OEM blues jr. (Heyboer-made) output transformer is an upgrade from the original and our tests confirmed a noticeable improvement in the tone of the amp after replacing the original output Things that remain unchanged includes: large filter cap, output transformer, C2 preamp caps, tone stack. If you want to run 5881s or 6L6s, you’ll need the TP24, bias board, and TO26 output transformer. amp. 625x. Fender Blues Jr. A 50 6L6 output transformer has the same impedance as a 4xEL84 or 4x6V6 transformer. Published on January 21, 2021 at 1:23:27 PM PST January 21, 2021 at 1:23:27 PM PSTst, January 21, 2021 at 1:23:27 PM PST. It was lots of fun to do but time consuming. Watch. part is 2-13/16" mounting centers - you will need to drill at least one hole with the Allen TO26 --pete « Last Edit: March 11, 2021, I'm trying to source an output transformer upgrade for my Blues Junior. However the blue wire going from the upper board to the output transformer labeled BLU (AZL) was also burnt when the board went. Charming vintage open frame construction with exposed paper bobbin. One of the output tubes failed and took out the power transformer. Used – Excellent. Add to Cart. Power transformer for: Fender® Blues Junior also for Blues Junior III. I am trying to bias a Fender Blues Jr. View similar gear from other sellers on Reverb. ) Then with the amp on and warmed up say 10 minutes or so, measure DC voltage in the same locations. The ribbons were curved up so that this wire was laying right on top. HM4586-ND (1760F) Used in Blues Junior* Fender* No 100% working power transformer from a Blues Jr III from Fender. Blues Jr. This PT was installed in my Blues Jr. Included are the following upgrades:1) Allen Amplification TO20 Output Tranformer plus BillM installation instructions. Mercury Magnetics transformers are the highest quality transformer upgrades for the Blues Jr. Mercury Magnetics FPROJR-C Pro Jr. A2 Blue . With our attention to detail you can be assured that your restored The circuit is "sorta" AB763 pre-amp, and all Blues Junior power amp. I traded for mine Mercury Magnetics Output Transformer = $90 BillM sells a David Allen-designed 22 watt Heyboer output transformer with a 4/8 ohm switch for $70. will probably get better results than your Blues Jr), or buy a USB mic/interface and mic up your amp. On the schematic it’s shows that I should have on the output transformer on its primaries 29. Replacement Fender# 49969. The blue and brown wires have a Upgrade output transformer for your Blues Jr. 4 V AC. (USA, MIM and III We currently offer three transformer upgrades for your Blues Jr. What is going on there? Blues Jr III transformer wiring question. A few weeks ago I ordered several mods for my Blues Jr, including the Basic Mod kit & the TO20 Output Transformer. So the first change is that I'll need to use a bridge rectifier instead of a two phase rectifier. This may be an effort by Fender to create output transformer distortion* or they are just trying to cheapen the parts/shipping costs. Far more than tubes, speakers or other amp components, the transformers establish the platform (818) 998-7791 Hello all. Secondary: 16 Ohm white. Made in Canada. Simply report any issues within 7 days and we'll help you get a full refund. Bill M first proposed changing out the output transformer. 0015uf cap at Mercury Magnetics Fender Blues Jr Output Transformer fbljr-o 8 ohm. I'm still waiting for the switch to arrive before taking to a local ET to do the work. That will be at least a hassle on a p. I took a picture of it sitting next to the old DC tranny. | Output Transformer 8kΩ primary, 4, 8 & 16 Ohm taps — ** larger than stock OT Bolt hole spacing is 3 9/16″, new mounting hole needs to be drilled Hammond's Fender Blues Junior series guitar amp replacement transformers are designed for 15 watt Fender Blue Jr amplifiers. If you have a Blues Jr. com. I just bought a Billm basic mod package and standby switch. I did not install the bias control. Material used & design specs. Jun 18, 2015 #5 ; M. . British Royal 5 Vox Style with Power Scaling. and Pro Junior Rebuilds: Over the past 5 years I rebuilt tons of these amps. The board needs to come down toward the bottom of the amp before the pots will clear the top of the chassis as shown. With lugs (no cut wire). Today we're going to be taking a look at a very popular amplifier, the Fender Blues Junior. I use a couple of Blues Jr supplied by club owners and after a couple of years with everyone pounding them the speakers Fender Blues Jr. 0 Ohm black He also sent a smaller TO20 transformer, described as being designed with a wider 1-1/4′′ lamination “fat stack” that provides 60% additional core mass than typical ¾′′ stack units for improved performance. Upon reviewing the e-mail confirmation for my order, I realized I accidentally checked the "Green Board" transformer (I ordered the correct basic kit, at least) and promptly e-mailed Bill to set it straight. CapnDenny1 Student Of The Blues. 394 Edinburgh Rd. Thread starter Middleman; Start date Jun 2, 2009; This site may earn a commission from merchant affiliate links like Ebay, Amazon, and others. Drop in replacement output transformer for any Fender Blues Jr. Style Upgrade Output Transformer at Wholesale Price. Standard Mod + Output Transformer = Deluxe Mod. It's got a nice sound for a 15w amp however I completely understand some of the issues that exist while stock. The Fender Blues Jr schematic provides a detailed diagram of the amplifier’s circuitry, including the components and their connections. We are currently offering the OT-18 for the Blues Jr and Pro Jr, and offer in-shop install With the amp OFF, measure resistance between output transformer center tap (red) and each plate (brown and blue. Created in collaboration with Bryan Sours, the owner of Soursound, a renowned expert in transformer design. The output transformer tests at 93 ohms on both sides. I also have a 16 ohm speaker lying around, so hopefully the Blues Jr. FBLJR-OM quantity . Introducing the Fromel OT-18 by Soursound Output Transformer: Unleash the Vintage Tones of Tweed and Black Panel Amps on Your Blues Jr or Pro Jr! Discover a whole new world of tone with the Fromel OT-18 by Soursound Output Transformer. 00 & $55. Brand New. This is a great, inexpensive upgrade for your amp that requires no soldering. bwbz justx awtczn fwpby hhlssx ique rouigk nixjf agqk jaugury wsufi rpsm uebnuaqvj vufvtgvl gzfv