Marstran Choke

I have a set of MARSTRAN transformers on the way 1203-80 PT, 1202-119 OPT, C1999 Choke. A full set of "Clapton" knobs. Also, Ive heard sometimes the polarity in the speakers is revrsed. A larger DCR will cause a larger voltage drop. According to specs, the Marstran C1999 choke is 150mA rated, and the ClassicTone equivalent 49-18058 is 250mA DC rated. Keep it simple and accurate to the Metro schematic. The Mercury Magnetics iron (power, reverb and output transformers and their choke) was sure a nice upgrade to my Deluxe Reverb. I'll bet the one George builds is even closer, seeing that he uses some NOS stuff that he was not including with the kits. and 16uf for the 2 preamp tubes. So, you may want to try 32uf for the 1st filter cap, 16uf after the choke for the screen supply, 32uf for the P. The earlier Marshall amplifiers used the Radiospares transformers. The stock early 70 choke is the Dagnall C1999 which 3H inductance with a DCR of approx. Handmade in the USA. Hi everybody! I know this is not really a guitar amp forum, but I was still hoping that somebody has a hint for me! I have a problem with my Marshall JTM45 amplifier, and I need help cause I simply don't find the solution. The choke was bang on 3H and the plate voltage I ended up with was 455VDC so I was thrilled. Marstran Choke Vintage New Old Stock Mullard Mustards Vintage New Old Stock Pihers/Carbon Composition Vintage New Old Stock Erie/Mullard Bias Capacitors Vintage New Old Stock LEMCO/Silver Micas Vintage New Old Stock Fuse Holders Vintage New Old Stock Bulgin Power Supply Vintage New Old Stock General Electric Corporation KT66 Power Tubes. 45-50w in stock singles. The chassis, PT and OT are Marstran, choke is from Metro, plexi panels from valve storm, boards I made myself, selectors are original paxolin wafers, head cab is made by Chris Uff in Norfolk (I added the Vox vents to match those on Ser. Joy Qiao is on Facebook. For sale is a Marshall model 1987T. And there's a certain "high crisp coldness" (no idea how to describe that better) which is common in typical non-choke amps like Engls. What effects have other people found with varying Choke Impedance? From my own limited testing, it seems like 5 Henries is the absolute smallest size you'd want to use with a JTM45 or 50. CLICK HERE TO CONTACT FOR SHIPPING QUOTE. Search the history of over 376 billion web pages on the Internet. Marstran Transformers added 6 new photos to the album: Open Frame Choke. Marstran OT (8K primary) Mercury Magnetics 7H choke PEC milspec pots Amber power indicator (because you know that will improve the tone) KT 66's of course I wish i'd replace the PT and rewired the heaters but it still sounds heaps better than stock. When I needed an OT replacement for my 1968 JMP, I contacted both companies, both replied and were extremely useful. and 16uf for the 2 preamp tubes. riad tigmino resq bologna rottam ittica entesite calcifica costo ossigeno inedito roberta. I left the choke since that would have the least affect on the sound. The choke was bang on 3H and the plate voltage I ended up with was 455VDC so I was thrilled. You will get "ghosting" of notes with this amp when playing it because of the low filter cap values and because of the 1st 2 preamp tubes B+ supply not being decoupled from each other. If you had to go out an buy this set of tubes, from a retail tube seller, they would run you about 2/3rds the cost of the amp. Obviously the pair of O/P tubes plates use the most current as they're what produce the final signal to the O/P transformer and then speakers. The chassis is Brian Marstran's Steel JMP 50 Replica Chassis. I will try to take a very close listen to see what the chokes will do for that amp. Well, sorry to start another OT, but I just wanted to have as much help with this as possible. Marshall reissue 1987x that's been upgraded to '68 specs with Marstran OT & choke and Metro boardwith an '07 Historic 59 Les Paul. As far as actual circuit tweaks: 1. What's confusing me are rave reviews about the JCM 800's 'killer distortion'whereas others say the only way to get any distortion is. S Piher Carbon Film Resistors N. My take is PT and choke are fine. For guitar amplifiers we provide accurate reproductions of classic transformers for Marshall, McIntosh, Fender, HiW. Quick links. Later i may replace it with the heyboer or a marstran or metro, but i'm not sure yet. With the amp almost dimmed you can play soft and hardly hear any distortion. I absolutely love this amp. If you had to go out an buy this set of tubes, from a retail tube seller, they would run you about 2/3rds the cost of the amp. The stock early 70 choke is the Dagnall C1999 which 3H inductance with a DCR of approx. 100ohms (the one I have in front of me measures 4H and 100ohms), pretty similar to the earlier Drake 352-114. When I needed an OT replacement for my 1968 JMP, I contacted both companies, both replied and were extremely useful. The chassis is Brian Marstran's Steel JMP 50 Replica Chassis. The filter choke is a 3 Henry job from Classic Tone. 15H @ 75mA Hammond 158L Choke: $15. Mounting holes are 3 1/2" apart, center to. The black transformer is a power transformer I sourced locally, however I decided to replace it, as I decided its current ratings were a bit low for my liking. What will the high put out? Having explained what I'm trying to achieve would it be better to to go Classic Tone for the PT and Marstran for OT and Choke? Or would the Marstran PT do the trick? Cheers. I decided i want to have a go at modding the jvm because i got it for a good price, has 4 channels and a lot of modding gueswork has already been taken out by contributing forum members like casey (thx btw!) Ive already done the negative feedback and plexi mods. I was disappointed to see that Ingo is closing shop because I'd like a full set from him but the guitar budget is a bit thin after Christmas and some recent acquisitions. Hey Everyone, This is my 2005 Marshall Bluesbreaker reissue. CLICK HERE TO CONTACT FOR SHIPPING QUOTE. Equally as much as the actual inductance rating, since the originals often cannot cope with the task. 30/06/2011 WILLIAMSON AMPLIFIER & PREAMP Page 11 of 11 5. This will have a massive bearing on ghosting and filtration. It took a bit longer than I expected to fund my project (student budget haha) but in the end I could have bought any brand I wanted but chose ClassicTone because of the amazing combination of your excellent support and personal communication with your customer base, unbeatable. Transform your sound with Marstran Transformers. The preamp cut out fits any 3/4" socket with 1 1/8" mounting centers. and 16uf for the 2 preamp tubes. Tubes: Some killer tubes here for you. When choosing a choke you need to consider the three specs above. OT is ok, but i tried my hammond and heyboer on it and i think both are a bit better to my ear. O capacitor eletrolítico duplo que desacopla DC para V1 e V2 instalado na placa PTP desse layout na verdade trata-se de um eletrolitico duplo tipo "can" (LCR, JJ-Tesla etc. I already replaced it with a 3H before doing this. Split katod på V1 med 820ohm/22uF på normalkanalen, 1. Head cab- Mather. There is also a Marstran 3H choke. Category Music; Song Choke; Artist The Red Jumpsuit Apparatus; Album The Hell or High Water EP; Licensed to YouTube by TuneCore (on behalf of The Collective Records); UMPG Publishing, CMRRA. My 45/100 with 530v and the RS 690ohm choke feels about the same as my 510v 45/100 with 110ohms choke I've gotta check out one of those chokes, that sounds cool. mixing types in different applications for that killer sound all ay own!. Kul att du frågar (och att även du hittat hit [:)])! Lite special. Description: This is a great output transformer for JTM45** style amps. At the same time, with a large choke, you'd also get a larger voltage drop accross it, resulting in lower screen voltage, resulting in less gain and earlier breakup. So I would have to put the MM red lead on the fuse terminal where the choke/OT is connected and the black MM lead on Pin #3 of each tube. 5 models are now using the Drake 784-103 output transformer and Drake 1202-118 power transformer along with Drake choke 352-114 all supplied by Heyboer. When I was really anal about this, I would pull the choke apart and set the Henry value myself. I am also looking to add a choke to my 6100. A restoration was performed by Rob DeAntonio of Jaded Faith Mods in Hamilton, New Jersey. Sections of this page. Som OT så är det mest valet av märke som känns knivigt. I can prove that to any potential buyers. While it is a tonal difference more people will characterize it as a "touch sensitivity" or "feel" difference. I really like Marstran and Classictone but Merren also makes a great OT if you don't mind the wait. I'm going with Merren's Drake repro for the OT and a Classictone 3H choke. These require some chassis modifications but the finished product sounds unbelieveable. Mojotone Quick Order Form! Please, follow these basic instructions to place your order: Add only the numerical characters of the Item Number. So I would have to put the MM red lead on the fuse terminal where the choke/OT is connected and the black MM lead on Pin #3 of each tube. This is a top of the line choke suitable for 50-100 watt amps. Front plate is from Metroamp. What's the deal with brands of Transformers? If you are into amps you probably have heard lots of hype about different transformers. 18watt: Manufacturer: Power: Output: Choke: ClassicTone: 40-18035: 40-18037: Mojotone: 18watt Power. Quick and dirty demo of my Marshall reissue 1987x that's been upgraded to '68 specs with Marstran OT & choke and Metro boardwith a Danocaster strat. Flat rate costs are listed below. If you want the Earlier JTM45 go with Merren or Marstran. The good thing about this amp is it's popular, and there is a ton of info if you do a Google search. Joy Qiao is on Facebook. mercury-magnetics hat solche teile im sortiment; diese sind aber recht teuer. 4H @ 90mA Fender Style Choke: $15. If it sucks i'll throw the hammond from the old amp in. The Radiospares choke is different from the Drake and Dagnall chokes used later. O capacitor eletrolítico duplo que desacopla DC para V1 e V2 instalado na placa PTP desse layout na verdade trata-se de um eletrolitico duplo tipo "can" (LCR, JJ-Tesla etc. Transform your sound with Marstran Transformers. com • omsvibro. com estimated website worth is US$5,776 (based on the daily revenue potential of the website over a 12 month period). Re: Replacement Output Transformers - Mercury, Allen, Hammond, others? I have Mercury Iron in my new amp (Fargen Olde 800) awesome tone I have also used Magnetic Components iron in amps I have built myself "Highly Recommended" good tone at a great price also a friend of mine has used Heyboer with great results too. Wallace's first amp is the BKW45, but he is more than a clone maker. The choke (inductor) on these early amps appears to have been the Radiospares 20 henry choke often seen on the early Marshall schematics. *5 Dagnall choke. Id take this over any boutique at any price as they usually skimp one way or another, use wrong composition parts or wrong NOS parts or change the layout/formula to much. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. 5 models are now using the Drake 784-103 output transformer and Drake 1202-118 power transformer along with Drake choke 352-114 all supplied by Heyboer. UF5408 Diode 1000v 3amp diodes. Wallace’s first amp is the BKW45, but he is more than a clone maker. OT is ok, but i tried my hammond and heyboer on it and i think both are a bit better to my ear. Post it a pay for play site and. The choke (inductor) on these early amps appears to have been the Radiospares 20 henry choke often seen on the early Marshall schematics. Amplifier and amplifier modification kits. 00 Plus Shipping Radiospares Choke: SOLD. I hit a Rockett Pedals Blue Note during the. Big List of 250 of the Top Websites on Vibro. Nope, too tight. As far as actual circuit tweaks: 1. Handmade in the USA. special order. So I would have to put the MM red lead on the fuse terminal where the choke/OT is connected and the black MM lead on Pin #3 of each tube. The transformers are originally from a trainwreck express amp, bought from marstran, the pt already has the lower b+ so you don’t have to use any zener diodes to drop the b+ down. I have also added two slotted holes for the output transformer for use with UK and US bell covers. But to be honest, I do not expect to hear much from the choke in that amp - just like the SL-X. Which Choke for jtm45/100 by Ydna » Sat Feb 12, 2011 8:56 pm I'm going to be building a Dickinson(Hendrix) spec jtm45/100 soon, and I'd like to know, what choke would be better, the 20H choke or the 3H choke. Damn tech lol. The preamp tubes are some early Telefunkens I have been saving for this project. Tänkte bygga mig en JTM45 alternativt en 2204a. Not sure the value of the choke, actually an old purchase from the JTM45 Group. 5mA 650ohm Classic Tone 40-18012 100w Output Transformer for Fender Guitar Amps Environment Resistant Voice/Tone Compression Driver with 2. Both Iskra, Mustards, Merren output and choke. If you put this triode in parallel with V2-B, you will get a little more gain and lower output impedance of this stage (but I can't "see" the effect on the sound). I'm just finishing up my board layout in vision and will drill it out tomorrow after I triple check everything. php%3Fid=7%26ul=0%26param=cialis [url=http://yandex. It's just a PT. In a typical amplifier using a capacitor input before the choke, the output voltage to the final stage is poorly filtered. com • vibroscreenmachine. Here's a close up of the turret board: Click to view full-sized image! Hosted by UGBox Image Store. The Marstran is going to have higher voltages on the power tubes. In electronics, a choke is an inductor used to block higher-frequency while passing direct current (DC) and lower-frequencies of alternating current (AC) in an electrical circuit. The choke (inductor) on these early amps appears to have been the Radiospares 20 henry choke often seen on the early Marshall schematics. This amp is a Marshall 35th Ann. Effective PT secondary resistance = 9Ω x (460/240)2 + 90 = 123Ω. A larger DCR will cause a larger voltage drop. All the other schematics take the plate currents before the choke. The 'essay' you linked makes sense, I just have to figure out how to wire this thing neatly. Mojotone Quick Order Form! Please, follow these basic instructions to place your order: Add only the numerical characters of the Item Number. * 7 Combo converted to a head. ) pois os originais nunca foram montados com as placas de turrets. I started with a Matchless Lightning home build I didn't like and converted it to JCM800 so it did have choke and tube rectifier. This amp has the lone filter cap (PI cap) on top of the steel chassis which makes it quite rare. 5 models are now using the Drake 784-103 output transformer and Drake 1202-118 power transformer along with Drake choke 352-114 all supplied by Heyboer. FAQ; Logout; Register; Home Forums At the Workbench Mark Durham Memorial; Donations. What's the deal with brands of Transformers? If you are into amps you probably have heard lots of hype about different transformers. No mods, no extra holes drilled. The Choke isn't just regulating power for the Screen Grids, but most importantly the B+ high voltage that is supplied to the Plates of the vacuum tubes (KT66's, ECC83, etc). When I needed an OT replacement for my 1968 JMP, I contacted both companies, both replied and were extremely useful. The choke was bang on 3H and the plate voltage I ended up with was 455VDC so I was thrilled. When I needed an OT replacement for my 1968 JMP, I contacted both companies, both replied and were extremely useful. Man, look things up if you want to learn, you could google that,,, damn. A great paper layer wound output transformer with 8K Ohm primary for use with KT66 tubes. The 'essay' you linked makes sense, I just have to figure out how to wire this thing neatly. My 45/100 with 530v and the RS 690ohm choke feels about the same as my 510v 45/100 with 110ohms choke I've gotta check out one of those chokes, that sounds cool. I guess most here at TTR are aware of my fondness for the early EL34 Plexi circirts, as Marshall moved away from the JTM45 & refined the circuit into the superlead. The transformers and choke are all 100% original, as are most of the signal caps throughout. Front plate is from Metroamp. I put a Marstran in my JMP and it works nicely, my only problem is this was before I got educated in more than one way re: amp repairs, restoration and crooked Amp techs that don't return your original parts when asked for them and then act like they threw away a OEM 1972 Marshall tranny. In a choke input filter the choke itself is used to store energy so yes, bigger is better here. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. JCM800 choke vs. Marstran 3H C1999 audio clip test Post by Gamedojo » Wed Feb 17, 2010 3:44 am I hope I didn't mess up the recording process because these two sound way more different then I was expecting. Featuring the most accurate Drake and Dagnall audio output and power transformers. 022 coupling caps after first stage 270k mixer resistors. Mojotone Quick Order Form! Please, follow these basic instructions to place your order: Add only the numerical characters of the Item Number. 4H @ 90mA Fender Style Choke: $15. Got a 2nd hand jvm and might do some mods to it already have a choke waiting and ive done the adjustable negative feedback mod. I may be forgetting 1 or 2 our studio also has a mesa mark IIc, bogner. Marstran 1202 - 119 output transformer and Classic Tone choke 40-18058 Plexi/Super Lead PTP circuit with Sozo caps and post phase inverter master volume Dual voltage (500 volts high and 460 volts low) 3 way standby switch - the down 460v position offers a greasy, loose tone with a spongy bottom end and the up 500v position is tighter and more. My plan is NOS 5U4GB JAN Phillips rectifier, new production Mullard CV4004 preamp and PI, and a new matched pair of Marshall branded EL34s. If you had to go out an buy this set of tubes, from a retail tube seller, they would run you about 2/3rds the cost of the amp. You may have to register before you can post: click the register link above to proceed. When I needed an OT replacement for my 1968 JMP, I contacted both companies, both replied and were extremely useful. I was disappointed to see that Ingo is closing shop because I'd like a full set from him but the guitar budget is a bit thin after Christmas and some recent acquisitions. Caps are Mallory 150’s and CDE silver mica, F&T’s for all the filters ($50 worth!), resistors are Dale RN65’s for the plate loads, and KOA Speer MF elsewhere except for those in the power supplies, which are Xicon MO. I'd go classictone, and do a Marstran or Merren for OT if needed. I can prove that to any potential buyers. Dann habe ich übrig: JTM 45 NT, JTM 45 AÜ, 1x GZ34, diverse neue Oktal- und Noval-Sockel sowie 1 Celestion Greenback und 1 Weber Ceramic Blue Dog, beide 8 Ohm. MERREN AUDIO has been providing 30 years of custom electrical design and engineering for HI-FI audio enthusiast, musicians and experimenters. All resistors (Iskra & Piher) & coupling caps (Philips Mullard mustards & RS dogbones) are period correct NOS items. I think MCI is a great value for the money and I use MCI output iron from time to time, but my first personal choices are Marstran and Merren. The stock reissue was very boomy, even with the bass at 1 mind you, and would completely fart out at high volumes with almost zero articulation. I hit a Rockett Pedals Blue Note during the middle part. Effective PT secondary resistance = 9Ω x (460/240)2 + 90 = 123Ω. Category Music; Song Choke; Artist The Red Jumpsuit Apparatus; Album The Hell or High Water EP; Licensed to YouTube by TuneCore (on behalf of The Collective Records); UMPG Publishing, CMRRA. If you had to go out an buy this set of tubes, from a retail tube seller, they would run you about 2/3rds the cost of the amp. And now the testing starts Any of my search term words; All of my search term words. There always seems to be that person who replaced their transformers and claim that they suddenly had a magical sound. com • bellevuewoodshop. Choke either brand. Featuring the most accurate Drake and Dagnall audio output and power transformers. The preamp cut out fits any 3/4" socket with 1 1/8" mounting centers. I used to own a completely stock bluesbreaker that I couldnt sell fast enough. Well, sorry to start another OT, but I just wanted to have as much help with this as possible. I have never tried a merren but know that they are supposed to be the best, I plan on using one in my next build. The solid green are my filiment wires and the green/yellow stripe. May information be divulged honestly and properly for the sake of us all, always. 4H @ 90mA Fender Style Choke: $15. And now the testing starts Any of my search term words; All of my search term words. Check out the links I posted. Marshall reissue 1987x that's been upgraded to '68 specs with Marstran OT & choke and Metro boardwith an '07 Historic 59 Les Paul. Re: Replacement Output Transformers - Mercury, Allen, Hammond, others? I have Mercury Iron in my new amp (Fargen Olde 800) awesome tone I have also used Magnetic Components iron in amps I have built myself "Highly Recommended" good tone at a great price also a friend of mine has used Heyboer with great results too. The smaller the choke, more loose. Both Iskra, Mustards, Merren output and choke. In general, the 1966 and onwards the Marshall 45 and 50 watt handwired amplifiers were equipped Drake transformers. I'll bet the one George builds is even closer, seeing that he uses some NOS stuff that he was not including with the kits. The pictures are of the amp after it was altered. I personally liked the stock one better. net • nexusvibro. com • vibrosifter. Suppose it is around 3H but never measured the thing but will the next time I have the amp opened up. Ein Hinweis: Wenn Du den JTM ein bisschen straffer machen willst nimm statt der originalen 20H Choke die JTM50/JMP50 3H Version, dann pumpt das Netzteil bei höherer Last nicht ganz so stark und der Sag reduziert sich ein bisschen was den Amp angenehmer zu spielen macht. I'm going with Merren's Drake repro for the OT and a Classictone 3H choke. My take is PT and choke are fine. Quick and dirty demo of my Marshall reissue 1987x that's been upgraded to '68 specs with Marstran OT & choke and Metro boardwith a Danocaster strat. According to specs, the Marstran C1999 choke is 150mA rated, and the ClassicTone equivalent 49-18058 is 250mA DC rated. This amp has the lone filter cap (PI cap) on top of the steel chassis which makes it quite rare. ClassicTone # 40-18083, Fender Tweed Bassman, 50W / 60W Output Transformer, 2 Ohm. I'll bet the one George builds is even closer, seeing that he uses some NOS stuff that he was not including with the kits. * 7 Combo converted to a head. There always seems to be that person who replaced their transformers and claim that they suddenly had a magical sound. I hit a Rockett Pedals Blue Note during the middle part. I guess most here at TTR are aware of my fondness for the early EL34 Plexi circirts, as Marshall moved away from the JTM45 & refined the circuit into the superlead. I'm still contemplating an older JCM 800 (4210 combo), but confused after looking at demos and reading reviews. I have a DSL 100 also and have done the same mods as JasonP ( Marstran C1998 Output Tranny and 3Hchoke). You will get "ghosting" of notes with this amp when playing it because of the low filter cap values and because of the 1st 2 preamp tubes B+ supply not being decoupled from each other. Nope, too tight. I went with a Fender Bassman RI power tranny and a Marstran JTM45 output tranny, and a JTM45-spec choke from Graydon Stuckey; head cab from Mojotone. special order. These require some chassis modifications but the finished product sounds unbelieveable. I have also added two slotted holes for the output transformer for use with UK and US bell covers. I think thats all of them. This thing rocks! Nothing gives you the chunk of KT66's in a Marshall circuit! I love my November, but this thing is on a whole other level. I will try to take a very close listen to see what the chokes will do for that amp. The Mercury is good product but over-priced. Also, Ive heard sometimes the polarity in the speakers is revrsed. The third video was with full band so it sounded better. My plans for building go as such:-Make a bill of materials-Acquire all said materials. Head cab- Mather. Flat rate costs are listed below. The best guitar amp transformers, output transformers and chokes in music. PT's are less impactful on tone. The chassis is Brian Marstran's Steel JMP 50 Replica Chassis. I'll bet the one George builds is even closer, seeing that he uses some NOS stuff that he was not including with the kits. Classic 45 uses a Bass circuit as all JTM-era models. This will have a massive bearing on ghosting and filtration. Quick and dirty demo of my Marshall reissue 1987x that's been upgraded to '68 specs with Marstran OT & choke and Metro boardwith a Danocaster strat. Hygrade 20h choke marstran special order marshall tube amp project/repair. The black transformer is a power transformer I sourced locally, however I decided to replace it, as I decided its current ratings were a bit low for my liking. - Marstran 1202-84 OT and Marstran 1204-43 PT, Marstran C1999 3h Choke - Alpha pots (almost impossible to find decent RS pots anymore) - mid 60's 1/2w and 1w Piher resistors. [ATTACH] I need some help identifying some wires on this 12005 power transformer. The choke will usually help with noise hum in the power supply which is really the main advantage to adding a choke. A few years back I owned 2 Deluxe Reverbs. This amp is a Marshall 35th Ann. Also, Ive heard sometimes the polarity in the speakers is revrsed. The tone change wasn't a parts tolerance difference. Quick and dirty demo of my Marshall reissue 1987x that's been upgraded to '68 specs with Marstran OT & choke and Metro boardwith a Danocaster strat. The Mercury Magnetics iron (power, reverb and output transformers and their choke) was sure a nice upgrade to my Deluxe Reverb. CLICK HERE TO CONTACT FOR SHIPPING QUOTE. Handmade in the USA. At the same time, with a large choke, you'd also get a larger voltage drop accross it, resulting in lower screen voltage, resulting in less gain and earlier breakup. Why don't you email Steve and see if he'll set up a link or at least a topice line somewhere. Shipping Information: All items are shipped through the United States Postal Service. Wallace's first amp is the BKW45, but he is more than a clone maker. If you really want to get serious about transformers look at spec sheets and compare new offerings to originals. Metro-Spec Plexi Replica Transformers Sort by Featured Best Selling Alphabetically, A-Z Alphabetically, Z-A Price, low to high Price, high to low Date, new to old Date, old to new Our historically accurate transformers are available once again!. Both Iskra, Mustards, Merren output and choke. The "accurate" OT for a 183 is the Dagnall C1998-style OT used in the old '60's Plexi's. Other than filter caps the rest of the amp is stock. When I was really anal about this, I would pull the choke apart and set the Henry value myself. Different tone stack treble cap. but nothing for 2203/2204, JMP, 800, etc. 4) a choke (in this application) keeps fluctuations, or ripple from the power tube's anodes, or plates, out of the HT supply to the rest of the amp by offer low resistance to DC & high impedance to AC. com • annapurnavibroscreen. Press alt + / to open this menu. Post it a pay for play site and. In 1965, Marshall began migrating to the Drake transformers. The smaller the choke, more loose. I absolutely love this amp. Use the Heyboer Transformers and the C1999 Dagnall Choke for 1966 and the other for earlier Bluesbreaker sound. Marstran Reproduction Vintage Correct Power Transformer. Metro says it's 3H, but Heyboer says it's somewhere between 4-5H. Hi everybody! I know this is not really a guitar amp forum, but I was still hoping that somebody has a hint for me! I have a problem with my Marshall JTM45 amplifier, and I need help cause I simply don't find the solution. Mounting holes are 3 1/2" apart, center to. Any ideas?. Higher voltages due to PT 3. Como estou querendo montar um JMP pós 1977, optei por usar uma placa tipo PCB pois assim posso me orientar pelo layout do original (via fotografias), com as placas tipo turret os layouts mudam um pouco dependendo de quem os criou (Ceriatone, Triode Electronics, Marstran, etc. Different slope resistor value 5. 022 coupling caps after first stage 270k mixer resistors. A place to talk transformers and more. The head shell, logo, rear cover, and hardware are completely original. in Chicago). S Piher Carbon Film Resistors N. I'd go classictone, and do a Marstran or Merren for OT if needed. com • annapurnavibroscreen. Different tone stack treble cap. Also replaced the OT with a Heyboer. The transformers and choke are all 100% original, as are most of the signal caps throughout. Beware of these substitutes! These may be substandard products that are not true replacements, use inferior construction methods and materials and lack the great features and pricing of our ClassicTone transformers. While you're in there, drop in a 3H 100ma Plexi choke. Has far as I've always heard, the two specialists in the Marshall department are Marstran and Merren. The 'essay' you linked makes sense, I just have to figure out how to wire this thing neatly. I built a JTM45 replica and was not sure what to do about screen stoppers. But to be honest, I do not expect to hear much from the choke in that amp - just like the SL-X. The chassis is Brian Marstran's Steel JMP 50 Replica Chassis. Everythough, they are made by Heyboer as well, they are very accurate to the original models, as are Chris Merrens which I have also used. My plans for building go as such:-Make a bill of materials-Acquire all said materials. Marstran C1999 Choke AEG EL34 Power Tubes N. Full sets which may include a Choke, Output Transformer, and Power Transformer will usually ship in one medium flat rate box. The early 75 had a choke. A good choke will make your amp quieter. Home; Forum; Perform; Amps; If this is your first visit, be sure to check out the FAQ by clicking the link above. While you're in there, drop in a 3H 100ma Plexi choke. Choke definition is - to check or block normal breathing of by compressing or obstructing the trachea or by poisoning or adulterating available air. This will have a massive bearing on ghosting and filtration.