Marshall super lead 100 crackling sound from transformer

One of the famous marshall plexis, it was introduced in 1965 and with its associated 4. It has recently developed a popping, crackling sound. One thing to note none of these involve modification to the original marshall circuit. Now, the hand wired 1959hw is a line right back to that celebrated era. Got a crackling sound on a 1970 major when hitting hard. Unplug tubes one at a time going from right to left looking from the back while the amp is making noise. Any info regarding this amp or any known mods or tube subs that will improve it in some way without being destructive would be greatly appreciated. Partridge was a very good quality transformer, much better than dagnall or drake. This article tries to give an overview over the early marshall 100 watt amplifiers by piecing together available information and shedding new light on transitional models from 1967. The following tips and tricks will enable you to get much more versatility out of the super lead. This is the finale of our early 1970s marshall super lead 100 model 1959 repair and overhaul. If i were writing down the details off the back of the amp, i would have written this. There is a crackling sound that happens all the time or sporadically this is usually bad preamp tubes.

July of 1969 marshall introduced the date coding system. Originally developed in 1965 to satiate pete townshends lust for power and volume, the 100. How can i tell the date from the serial number 019341. Dsl is an acronym for dual super lead, so it should come as no surprise that this amp has two footswitchable channels classic and ultra. With blue or white vinyl finishes, all brass plated panel and marshall script logo, this was an amp that screamed glamour. Still one of the most used marshall ampds on stage. The owner was complaining that it would all of a sudden start crackling. The following marshall super lead tone tips and tricks will enable you to get much more versatility out of this legendary amplifier. Some of the older amps have an inspection sticker on the top of the chassis and they usually have the day, month and year the amp was made or inspected. It is the 2nd time is has happened so i thought i best get some advice. Now i need a hearing aid 1971 marshall super lead 100w. I have a 1971 marshall super lead 100w head in mint condition. A guy in nashville who is supposed to be an authorized marshall repair tech. To be able to drive a 100w tube amp you need to play loud.

Merren audio power transformers are engineered for longlife and trouble free operation. The jcm2000series dual super lead amplifier comes as a 50watt dsl50 or a 100 watt dsl100 right. If the output transformer shorts between windings it can lead to no output, weak output or funky. Clearish sound at the beginning and then some gain. Rs spares or drake transformer used in the jtm45 the drake rated at 8000 ohms some jtm 100 amps appear with the jmt45 badge in late 1965 check for two 50w transformers and a solid state rectifier 1966 features. If you have a 100watt tube amp, its probably going to make more. This article tries to give an overview over the early marshall 100 watt amplifiers by. Last year i built a super lead clone, in december it was finished and it was ok and played beautifully. Amplifier power transformer replacement parts mouser.

Yes, the vox ac 30, fender bassman, and even the marshall jtm 45 came well before marshall s famous 100watter. This amp is basically the 50w version of the super lead, so the sound is really similar to its big brother. Theres a lot of iron in a power transformer, so these tend to be the most expensive part in an amp and thus can potentially be the weakest link in the signal chain that contributes to quality and tone. The hiwatt custom 100 dr103 august 8, 2014 amplifier features, amplifiers 100 dr103, custom, hiwatt david szabados when marshall amplifiers became wildly popular on the music scene in the mid 60s, clone and copy makers soon followed with their own versions of the famous marshall super lead. The 100 watt marshall super lead model 1959, aka the plexi, was really the first guitar amplifier purposebuilt for rock and roll.

Legendary tones marshall super lead tone tips and tricks. I opened the power transformer to see if it has burn but it seems like normal. I wired threeway lorlin rotary switch for ohms select on a copper plate mounted to cover previously discarded original linevoltage and ohmspeaker select switches corrected some poor psu mods, replaced missing signal caps in preamp with nos mullards from. Marshall jmp 1959 super lead 100watt guitar amp head 1972. How to fix a crackling tube amp top tube amplifier. In the previous video, we called the customer to find out how far he wanted to go with servicing it. A rebuilt 1972 marshall model 1959 super lead 100 watt head. I bought a marshall master model 50 mk2 lead jmp 2 12 combo back in the early 80s. Everything was ok until one month ago when i started hearing a loud crackling noise from time to time, the it started regularly, and finally the ot fuse blown up. Tube noise such as sputtering, hissing, popping can be tougher to find. Those looking for the true marshall sound only need use an original, unmodified super. In the build i included also a ppimv and a zero loss fx loop. The allvalve 100 watt super lead heads of the mid to late 1960s 6769 with the famed plexiglas front panel, have been the holy grail of great rock tone. The amp is completely dead if the amp is completely silent no speaker hum or hiss at all then the problem can be just about anywhere in the amp but you should suspect a bad tube, blown fuse or the power supply in that order.

In 1966, marshall then switched to a single drake pn 784084 output transformer wound for a primary impedance of 4,000 ohm four kt66 tubes. Marshall 1959slp ri hw and nonhw infatuation the gear. I dont think ive had or played any marshalls from 74. The winding geometry as well as core material have been matched to the original. The power indicator lamp on the control panel lights, preamp and power tubes all glow, but no sound at all. This is my marshall jcm 2000 dsl 100 with static, crackling issue. Every 1959 super lead after 1974 had mkii super lead 100w written on the back. Crackling noise on 1973 super lead 100 watt marshall amp forum. Marshall 1959hw handwired plexi 100watt tube guitar amp. The popularity for the 100 watt amp exploded through the late. The new super 100jhmarshalls latest handwired modelis based on an original super 100 reportedly owned by hendrix. Customers have been delighted with the sound of this transformer and amazed at how authentic it is to the original one.

Defective plate or cathode resistors can cause constant static, crackle and pop noise. Discussion in lets talk vintage started by bstoner, jan 14, 2020. I use an old super lead 100 and it is loud enough for any gig. The 100 watt marshall super lead was the amp that started it all for the greatest rock and roll tones achieved or i should say, the greatest loud rock and roll tones of the 60s. To the minds and ears of many, the allvalve 100 watt super lead heads of the mid to late 1960s. Marshall transformers, transformers and chokes from. This one needed a new power transformer and a new set of output tubes. Jtm 100 and jmp 100 in 1965 the jtm45100 prototype and production amplifiers were equipped with two jtm 45 drake output transformers four kt66 tubes and an upright rs spares power transformer. If your tube amp has suddenly began to crackle, youre likely to find yourself. Marshall dsl100 dual super lead repair new power tranny.

I took bucks 1976 transformers from his old marshall super lead 100 mv and built him a. Marshall 1959hw super lead 100 monumentally huge, frightfully loud, and painfully expensive, the 100 watt marshall stack has been the undisputed icon of rock for the last 40 years. Brand new marshall amp making a staticcrackling sound. This amp was at one point modified with another preamp tube and. Some of the older amps have an inspection sticker on the top of the chassis. Tone tips and tricks for the marshall super lead david szabados. This also features the best available, cool running and high performance m6 steel. Great vintage era type constructed, paper layer wound power transformer for 100w plexi type amplifiers requiring laydown style mountings a. The marshall super lead model 1959 is a guitar amplifier head made by marshall. Oh yeah and like bruce, i also love the early 8081 and vs100 valve states. The new amps construction is consistent with that of the original. Over the years, the phrase marshall plexi became most affiliated with the superlead model number 1959, an updated 100watt design introduced in late spring of 1967 that evolved through 1969.

I usually use celestion creamback 65 watts, but through scumback bm75s, it gets a lot more edgy. Marshall 1959hw 100 watt handwired tube head 100 watt 2channel tube guitar amplifier head, handwired, with 3band eq and highlow sensitivity inputs the 1959hwtm is a line right back to the celebrated era of the mid to late 1960s, the original was born when pete townshend asked jim marshall. The amp is completely dead if the amp is completely silent no speaker hum or hiss at all then the problem can be just about anywhere in the amp but you should. From the early jtm 45 prototypes to the bluesbreaker combos and later innovations, marshall stood for a particular sonic response, a brand of british rock quite separate from the jangly tones. Here are some things to look for if your tube amp is making intermittent crackling type noises. Our worst fear is that the main secondary of the power transformer. But then again, marshall is my sound, my generation, etc go for it if you havent already. The marshall 2000 250 watt lead amp also blew many output transformers. Grab power tubes by their plastic base, not by the glass. The first super lead heads used el34 power tubes in place of kt66s, dual solid state rectifiers, and a single 100watt drake transformer. Marshall amps had such precedentsetting wattage and tone that their history can hardly be separated from the history of rock itself.

Being music makers ourselves, we love geeking out on all things gear. You can test whether the speaker is getting a proper signal by connecting one multimeter lead to the. Marshall 1976 jmp model 2203 master volume rebuild project. Weave all experienced hissing, buzz, crackle and hum. Easy fix made difficult marshall jcm2000 dsl100 repair.

Once the partridges ran out, marshall never used them again in their amps. The amp powers up but the guitar audio sounds weak or bad. Hybrids that probably do the run the marshall range from clean to. Although many amps are referred to as plexis the 100 watt super lead model number 1959 is most commonly associated with the name. All transformers are double varnished and baked for ultra low noise operation. This is an exact hand wound reproduction of the original 7849 50w output transformer used in marshall amps from the late 60s through late 70s. For reducing the brightness as well as overcoming what was to me a muddy sound. The amps bias makes a critical difference and you really should know all of the bias settings for each amp you own and what the voltage number of the tubes that are in them, especially if you like how your amps sound. The tremolo version was an idea of pete townsend but it wasnt very popular and not many were produced. Built to vintage specs with exact interleave ratios and materials. Classictone transformers home page marshall style transformers.

We also look at a couple of the very vulnerable spots. Im pretty confident that if partridge provided the ots for the majors, the majors would have had far fewer ots blow. The omission of the preamp gain control is where the 100 watt marshall super lead s legendary tone truly comes from. The valve and transformer covers were also brass plated. Not only did it sound great but it looked good too. Marshall date codes early marshall through the jcm800 series. It sounded a bit dark and dingy at first but i recapped it and it came back to life.

This 100 watt legend is hand wired by the masters at marshall. There are 4 preamp tubes with twistoff tube shields and 4 large power tubes or 2 in the 50watt version. Up to that point, amplifiers by fender and other companies were built. Marshall jcm2000 dual super lead 100 head music123. Just when i play certain chords like an open a or if i hit a b bar chord on the 7th fret, its really bad. A guy in nashville who is supposed to be an authorized marshall. This marshall dual super lead head came with a customer complaint of glowing tubes but no sound. My new code 100 2x12 has a prominent digital fizz noise it also crackles, very unpleasant specially when you use tremolo, chorus, delays. Heavy duty built quality, lots of power and easy to handle.

That is, dont ever run a super lead head at 16 ohms into an 8 ohm cabinet as it puts a strain on the head and could damage it. Jul 18, 2019 while fender and vox amps have their place in moving electrified guitar forward, the creations of jim marshall fostered an entirely new sound and allowed guitarists to fill stadiums with it. Ive tried unplugging and quickly replugging the instrument input and speaker cable, turning all knobs, and depressing and releasing the fat switch. The 80s were a time when many musicians opted for the hotrodded marshall sound a. How the marshall plexi, 2204 and jcm800 amplifiers work. The gain channel is distinctly early marshall, with all of the awesome qualities of the plexi and jtm amps. Everything was fine until a couple of weeks ago, when i turned it on and began making a static sou. Your amplifier transformers recieve the same level of detail as with our designs residing in fighter jets and critical space applications. Marshall style cabinets vacuum tubes speakers tolex and tweed grillcloth transformers test equipment vacuum tube accessories chassis baffles adhesives glues capacitors resistors turret eyelet boards back panels cabinet hardware amplifier kits bias testers faceplates knobs capacitor kits covers logos pilot lights pots reverb accessories reverb tanks capacitor pans. These pesky noises can come and go or be triggered by certain notes. Please click on transformer for wiring diagram rohs compl. Marshall 1987 lead, 2204 master volume lead and jcm800 lead series 50 watt power amp the simpler 50 watt power amp is shown below but the 100 watt power amp used in the super lead plexi. A weaker power supply for ss rig wont magically turn sand into glass audio ss power stage is a very different beast and dont work like a valve power stage though you can make a valve.

Legendary tones the marshall shoppers guide part 1. Bought a new marshall amp less than six months ago. When this happens, the natural hum from your power transformer is no. The first 100 watt amps known today as jtm45100s used jtm45 plexi faceplates and white super 100. There is a crackling sound that happens all the time or sporadically. The multinational primary voltages of 100 120220230240 are featured here. Tone tips and tricks for the marshall super lead by david. Old transformers and leakingdry caps will add noise but also cause irregular. If you see this you know with 100% certainty that the tube is bad. From what ive read in 1968 12xxx was mostly what was showing up. The legacy of marshall amps doesnt rest solely upon the 100 watt super lead, though. Marshall jmp 1959 super lead 2channel 100watt guitar amp. The 19651967 marshall super 100 amplifier aka jtm45100.

Let the tubes warm up about 30 seconds before you turn on the second switch. A a hi there, i have a fender hot rod deluxe that is just six months old and well looked after. Aug 08, 2014 moving over to the o50jm, i was amazed at how different this transformer sounded, even though other than the lead wires that exited the transformer, it has the same specifications and parts as used in the o50jmsl. In this video we take a look at the innards of a jcm2000 dual super lead 100 watt head. Rockitt retro 100 watt plexi, 1959 superlead plexi replica. Also, this is a great lay down type power transformer for for use in 100w or so diy amp projects and new oem buildssee specifications for details. To get the sound, one needs to turn up the amp to a loud volume to distort the el34 quartet power tube section. Now i never tried this amp out and its not possible for me to try it in the near future, so i just wanted to see whether you guys have any experience with these amps. Yeah, the 68 i have can sound pretty distorted and aggressive, especially through the right speakers. I recently picked up a marshall lead 100 mosfet model 3210 made in 1987 and have to say its impressive, especially for being a solid state amp.

Transformers should always be installed by a professional electronics technician since there are high voltages involved and may result in serious physical harm to yourself, the transformer andor your equipment if installed incorrectly. If you cant find a 100 watt bulb for your limiter a 150 is the next best thing. Marshall 1959hw 100 watt handwired tube head 100 watt 2channel tube guitar amplifier head, handwired, with 3band eq and highlow sensitivity inputs the 1959hwtm is a line right back to the celebrated era of the mid to late 1960s, the original was born when pete townshend asked jim marshall if he could make it louder. Aug 08, 2014 the omission of the preamp gain control is where the 100 watt marshall super leads legendary tone truly comes from. I just bought this 1968 marshall super lead 100w plexi. If your tubes burned out, would you know how to get the same sound back as you had before. Transformer marshall, power, for jtm30, 30 w antique. If you find that the fuse blows after replacing one of the power tubes, and still blows when you install a known good power tube, you could possibly have a blown output transformer. I dont think you will go wrong with the super bass.

New models of the transition era while all those changes happened, new models started being developed to expand marshall s catalog. A damaged amplifier is an obvious reason for changing parts out. Hey guys, im about to buy the marshall super bass 100watt mk1 for bass guitar obv. After installing it, i knew that the o50jm was the choice for the hardrockers, whether using a plexi or metal panelfront marshall. If your amp is making loud, staticy sounds when you play, you may. Jul 22, 2009 it made a crackling sound, then no sound. If the sound does not occur, try turning up the volume controls to the. You dont want to hear the crackle but rather feel that its there. Closest is a super lead from very early 1976, but its had a master volume installed. Marshall 1959hw handwired plexi 100watt tube guitar amp head. Photos inside a twin reverb, deluxe reverb and marshall super lead with internal parts identified and described. Im getting a crackling kind of sound but not all the time.