Fullbridge amps from KOREA (Zenon) - What are they like?!

Brazilian fullbridge amps are gaining in popularity, so what does one factory in Korea have to offer? I will be looking to make a proper fullbridge vs halfbridge / korea vs brazil video in the not too distant future so if that interest you, be sure to subscribe!

[@wal]

Awe yeah, getting close to 50k subs! Good to see you back in action brother!!

[@numlockkilla]

Yeah I've been watching since the old door cards for his TL door panels. I wanna see that cars front stage finished. It's so clean.

[@matrowbrify]

I was considering running the new wolfram oxygen series when they come out next month but I will wait for big D to dyno one to make sure its worth it.

[@kylejirousek5832]

Williston audio labs. Can you dyno a concrete audio 8k? Very curious. Claims 9500 watts 14.4 outta an 8k.

[@GlycerinZ]

11 months later and only an additional 7.1K subs? He should have at least a couple hundred thousand, but I imagine he's just too advanced for most people. He REALLY knows his shit

[@Sawyer0608]

Bruh why were none of my college professors as interesting / dedicated as you? I went into electrical engineering to learn exactly stuff like this and its sad its not found anywhere in any curriculum. Much love my man! Ill be the first to hit up any books you decide to write ;)

[@PHUSII]

It would be interesting to see you build your own amp, get a blown amp with a correct board or just get a bare board and install just the right components and make it the perfect amp for yourself! It could be like a series over time. Slowly build it as you acquire the parts you need. Also, thanks for this video, really a lot of information on the fullbridge amps!

[@TuffApe]

Id like to invest in his product.

[@michaelnichols5034]

Glad u started making videos again I learn so much from these u know if you are try to push and get as louder u can't do it with the small income that we have and raise a family so now that I can work on my own stuff that brakes I can GET LOUDER

[@infamousdtownm9385]

Dude you are a beast 💪 at this... i wish I could find someone here in Dallas Texas that can do what you do. But seriously, I appreciate your knowledge and vids. Great job and thanks.

[@matt.246]

Love your videos. Big shout out from Barbados 🇧🇧💯👊

[@25hztolife86]

I can hear you for hours explaining how amps work. I wish I had your knowledge.

[@cekpi7]

Basics of how they work are really easy, combine that with hours of experience and you got it. Once you start repairing or designing things, it just makes much more sense.

[@anthonymcwhorter6287]

im sure its a gift and a curse.

[@ScramTek]

He said in another video that he has no formal training. All self taught. I find this staggering. His knowledge and the ability to convey it quickly, and to make it interesting and relevant is quite a talent.

[@midnight-xpress1136]

He is literally the Louis Rossman of car amps. Self taught and just lots of trial and error experience.

[@GlycerinZ]

@@midnight-xpress1136 Rossmann is very entertaining! I found his channel in 2014, when he had like 22K subs. He's damn good also

[@pliedtka]

Man, your are ClassD encyclopedia. Maybe one day you should do recommended components, like Hi-Fi Choice, based on actual design, reliability. When I spend couple of hundred bucks on something, I like the thing to be serviceable and repairable, old school, sort of like old AB class amps. But with Mosfets in parallel, yeah even the same batch doesn't guarantee that they be same one doesn't die. Maybe that's the reason Nelson Pass class A and AB big amps are so expensive, he most likely matches out tranies for his amps.

[@dce428]

Thank you for the video. You showed and explained what my spider sense was trying to tell me. About those Amps. Very educational would like see more videos like this. And some old school amp repairs. Linear power 5002. Ect. As a comparative how things has changed and how things has stayed the same. Over the years. Thanks 👍👍. Really enjoyed the amp repair side of the vid explaining as you went through it

[@Conservator.]

For who’s curious: the IRFP4768PbF cost about $5.03 a piece and $37.15 for 10 at LCSC. I don’t know if LCSC can guarantee delivery of same batch mosfets. I assume not but since they do usually have large amounts in stock, (oops, just 26/37 at the moment) chances are that you will get same batch mosfets anyway. I’ve no interests in any way in them.

[@Conservator.]

You’re a great teacher Sam, tx!

[@scottmcrae7211]

I was a JL Audio dealer when the HD amps came out years ago. Was wondering how the HD amp line could be so much smaller than the slash series with similar output power. Now I understand why. Thanx!

[@middleclassic]

Newbie here and ... I think I may have just discovered the human encyclopedia of amps ... Yes No? I'm listening to this guys for minutes straight spewing of number this and capacitor that and ... whew! Tech Head of amps. I've got a feeling I will be back for more as amps ... repairing them has always been a close need to know of mine.

[@JaredElliott1]

I love the 'LFN' hat!!! Excellent!!! Great explanation on the amps!!!!

[@joshhaimes]

Subscribed. I'm interested in a full vs halfbridge video. Less interested in the 'amp guts' and components discussion and more interested in a practical comparison of the two technologies as monoblock bass amps. Some topics to cover: efficiency, sound quality, power rating at 1khz vs 40hz, which is better for daily driver vs spl lanes. I think the ultimate question a lot of people who are running 1000's of watts to their subs have is: why would I spend $0.25/watt on a halfbridge when I could spend $0.10/watt on a fullbridge? That adds up to 100's of dollars. What compromises are made?

[@Tmanstomp100]

Hey Sam, I love the amplifier repair vids I've learned a lot watching them, you inspired me to have a home audio setup using car amplifiers on power supplies but, It would be great if you made a video on the power supplies you use and how you have them hooked up in more detail, ATX are easy to use but i know nothing about dell server power supplies

[@Conservator.]

Hi Sam, The BD139 has the BD140 as its complementary transitor. They have a maximum Collector-emitter voltage of 80V. The KSB772 has the KSD882 as it complement and the have a Collector-emitter voltage of 40V. Is there a reason that you mix the two in stead of using the complementary transitors or is it that you just happened to have those two at your bench? 😉

[@qshooter151]

Super informative! Thanks for taking the time to share your knowledge!

[@sHoRtBuSseR]

Interesting to hear. I've never been a huge fan of full bridge design just because of reliability. Yeah, I'm overpaying for a half bridge Korean surfboard, but they are built like a brick shit house.

[@dilleoc5759]

Very good knowledge, thanks for all the help. I learn something new every video i watch of yours, cant wait for ocillascope tutorial. Just bought a new 2 channel scope.

[@ats89117]

Very impressive exposition. You really know your stuff. The output stage heating under low load is intriguing. It has to be due to either the transistor switching more slowly than optimal, or with excessive shoot through. It would be interesting to look at the current vs time waveform through one of the excessively heating transistors to see what is causing it...

[@johncameron4172]

I just subscribed to your channel. You know your stuff. I am sure many people have asked if you’re interested in creating your own amplifiers. I’m hoping I can learn a lot from you. I simply don’t have the equipment necessary for what you do. Anyway, I’m sure that you’ve heard of Skar audio. I believe that it was started by a young guy in Florida. They make pretty good stuff. My point is that if you started your own business then people would buy it. I need to learn how to replace mosfets. So, I’ll be watching. You are great!

[@bmwsale8]

Love your videos. Learning a lot with you and from you :)

[@Felix-vd4du]

Great cutting mate👍🏻👍🏻👍🏻👍🏻 you are doing a Great Job

[@3RDERA]

Good stuff Sam! Ktb772 is my go to and will be faster for sure. I think Brazil’s “health check” on power up, was a tech they had to advance and streamline with all the early problems they had using bigger and more robust output fets and trying to balance that with heat dissipation. Plus doing all that at a certain $$ amount. Zenon needs to step their game up, modern components have proven their reliability already. What a Shame.

[@SaltwaterBoogeyman]

Love your videos and you got a new subscriber. The knowledge is crazy but understandable. That look similar to the oxygen 10k coming out with slight differences. Amazing videos bro

[@blaspogelse8376]

Do you hae any experience with Powerus amplifiers?

[@davidengland6741]

Are the Skar SKV2 amps Korean boards???

[@nicholasboyarko1680]

Small filtering cap on mosfets? Sounds like they are attempting to boost efficiency by constantly hovering around activation voltage of mosfet, probably in an attempt to drive them faster or harder than their ratings.

[@Bassotronics]

Great video! 👍🏻 I’ve learned many things.

[@dailyfilmfix469]

I have a question unrelated to this video but it's about amps.. I have two active 75w rms Sony home theater subwoofers in ported enclosures with a 100w max output.. I think the low-pass cutout is around 35-40hz but I wanted to know if it is possible to increase the output of an amplifier in general and change the cutout range to a lower frequency? I think you mentioned about using more powerful components and possibly replacing the factory-installed ones but I can't quite remember exactly what you said.. I replaced the original subs with newer ones that can handle three times the power and they are 8 ohms like the factory speakers.. The old subs were damaged so I went on Ebay and bought two Logitech 10" Z5000 subs which sound pretty decent considering.. They were removed from enclosures that had bad amps and other issues but the speakers worked fine.. I know it probably sounds stupid but I was just curious and with your knowledge, you'd be one of the very people that could answer my questions.. Just so you know, I looked everywhere for two direct replacement mica series subs and even Sony didn't have any!!

[@carlitomadrona6211]

I can't find a timer to time how long you focused the cam on you versus on the subject, haha you can always explain things aiming your image producing tool only on the amplifier✌😂😂😂😂👍👍👍👍

[@josealonso1840]

You should put some amps together and call the brand Frankenstein power.and make them beast for high output.

[@eddieyocom5140]

What brands share that same board?

[@nickolaswilliams935]

Love the channel, it’s fun learning about class D stuff isn’t it? Anyway, thought I’d post cause I noticed something odd with the output section low side drive on this particular amp. Ideally you want the low and high side to see the same crisp drive wave, with appropriate amounts of dead time to prevent shoot through. High side looked great, but the rise time on the low side looked really slow to to me. This means the low side devices will spend a larger percentage of time in the linear region than the high side devices, which may explain the uneven heating. This can be caused by a number of factors, but my experience has been that gate resistor value has the largest impact on rise time all other things being equal (same drivers, same gate capacitance, ect). You might try experimenting with slightly lower gate resistor values to see if that makes the gate drive more square, just be careful you don’t exceed the drivers ability to provide gate current. Too low a resistance can overstress the driver and blow it. Data sheets will be your friend in this regard. Good luck with the repairs, if it were my amp I’d want to look at that low side to see if any improvements could be made.

[@barevids]

Thanks for the comment! Yeah the first time I got one of these in I messed around with gate driver values and different drivers and all sorts. Didn't seem to help at all.

[@nickolaswilliams935]

Interesting that nothing helped, do you recall if the same wave was present at the output pin of the driver vs the FET itself? The increased time has to be coming from somewhere, either by additional capacitance elsewhere in the circuit or because the wave was generated that way to start off. With the size of these amplifiers, I wouldn’t be the least bit surprised if the gate traces on the PCB introduced additional unwanted capacitance which wasn’t taken into account during the design phase. Usually the data sheets for the drivers and TL494 chips tell you to be especially careful with layout, mainly for radiated EMF reasons. Anyhow, thanks for the response and keep up the good fight. Cheers!

[@lanman31337]

Hey buddy, you asked about one big transformer vs multiple smaller transformers - Taramps/Soundigital/PRV/ETC runs a single or dual depending on the board just for a compact space. It's more cost effective for a single bigger transformer, and only one point of failure, but multiple smaller ones run cooler and less interference.

[@barevids]

Sweet!

[@RobHTech]

What brand amp is that? Is full bridge more risky than half bridge, for example short circuit, fire, over heat, pulling more power from battery/charging system than half bridge?

[@ifitaintbroke7427]

Where about are you located? I would really like to send my amp to you to have it repaired, it's a Rockford Fosgate Power 851S. I know it would cost quite a bit to ship, being as I'm in USA, but your like the only person that I would trust with that old amp to get it back up and running.

[@barevids]

I don't take on work from overseas I'm afraid, sorry dude 😔

[@royresha4073]

So is this kinda like the new wolfram oxygen series amps??

[@Frankiebonez337]

Did he ever make a full bridge vs. half bridge video? I'm looking for info on the differences. I cant find nothing really good out there.

[@hardhead7056]

I though the 7k your talking about had a fan on the circuit board. Nc7k. Why is it not on that board? Most all full bridge amps these days have one.

[@150db8]

Out the case. The 4k 6k and 10k all have 3 fans. 2 on board where the X is on the power input side. And 1 in the backplate.

[@barevids]

There are 2 fans by the power terminals...

[@kozkoz7776]

Thanks for doing this tutorial i commend your time producing this video it helps all BASS HEADS like myself own many amps / speakers what help i DO NEED is HOW to clean a circuit board from oxidation on a 40 yr old amplifier this is a classic ACOUSTAT TNT 200 pur mosfet designed to drive Electrostatic speakers *board is showing oxi on the solder joint what method should i use

[@quartaylu]

REALLY want to see that “Korea vs Brazil” and “full vs half bridge” video soon :)

[@barevids]

It's in progress!

[@quartaylu]

barevids YES!

[@uptobatentertainment]

Very detailed explanation. Thanks for sharing the info that you do Barevids 💪✅

[@johnnypiper1717]

You think sundown Salt series amp are built that much better and perform to justify a price tag of say $1119 for a salt 3? Heard they have better components is why they cost so much more then others. I am assuming they have a mark up for the sundown name as well huh?

[@10krms8]

Do u know if the new wolfram audio o- series amps are korean full bridge or chineese

[@adamneill9237]

Korean w/ final assembly done in China. That's why you're getting 4k for $299 & 6k for $399(pre-order)

[@ruckusenclosures7034]

Loom at the board this is the wolfram o-6000

[@Tig-Rig]

Is there a way to get you to repair a old soundstream 1600/2 amp of mine? The old all chrome huge one from early 2000s. It's been put up since it quit working 10 years or so ago.

[@hectorortega9131]

Why some amps produce a big Thump and othes dont?. How can i cure that?. Hifonics brx 1700.1

[@kevinAuman1]

Now wait a minute, so is my Wolfram AW-9000.1D and AW-5000.1 which are korean Zenon amplifiers are they half or full bridge 🤔 I always thought half as they're strappable but my board sure looks similar to this one 🤷‍♂️

[@barevids]

Any amp that's strappable cannot be full bridge.

[@HagiRoku]

Can you tell me what the ds18 FRX3.5k amp typology is. If it’s Brazilian or made in Korea? And if you think it’s any good. Thank you

[@2slofouru]

Having multiple smaller transformers may also prevent stray emf influencing surrounding components...

[@eddylorenzo5033]

Do u fix amps would like an over haul on a 1200 ppi art series works great still but old components maybe we can give it s bit of an upgrade

[@michaelnichols5034]

Do u have any updates on the sound digital amps

[@SubwooferGym]

Do all of the new ds18 full ranges use zenon boards? I've got the Ds18 FRX 2k. Your livestreams are excellent btw always a lot learnt

[@150db8]

Depends on line. The FRX line is Chinese. The pfull range pro" 4k, 6k and 9k are all these same amps here. Particularly this is the same aa the 6k as seen here.... intl.ds18.com/collections/pro/products/pro-full-range-class-d-monoblock-amplifier-6000-watts-rms-1-ohm

[@sparco317]

@barevids sam is this amplifier design similar to the deaf bonce 11800?? I heard they were full bridge zenon like soundigital

[@barevids]

Nah, those ones actually ARE sound digital lol

[@sparco317]

@@barevids Is it any good? I will be running two of the 11800s at 1 ohm each on 4 avatar svl 1847

[@DIYAudioGuy]

I have one of those Alpines, had no idea it was full bridge!

[@mikemoses1009]

On out put caps can I replace them with more powerful ones and get better output in let’s just say A Boss 4000watt 1 ohm amp

[@MiguelGarcia-yw2jf]

Why is it that the Phoenix Gold Xenon amps like the Xenon 100.2 have either turn on pop and turn off pop or even both? The Phoenix Gold Xenon amps are great but its a shame they have this.

[@ogscythe6118]

Question; I have a MRP-M2000 that will at times only produce a low amount of “sound” and then peak (full throttle volume). Is it worth to fix? Would it be easy enough for a novice to troubleshoot and fix myself? Thank you in advance.

[@GrounDControL873]

Will you sell it?

[@bassmansl9596]

Brilliant man🙏💯💯

[@AnnaVannieuwenhuyse]

Those breakout boards are old tech, and are known to have a significant resistor death flaw.

[@stevesmith3033]

Love your videos bro! I was wondering what brand your thermal imaging scanner is? I want to get one

[@666nacirema666]

hey awesome subject was just talking with some folks on facebook about non brazilian full bridge amps

[@matthewmassey2333]

Hell yeah droppin vids left and right you must have barevids mate🤙 lol

[@Minni_U]

what is the best micro or mini amp that you would recommend that are efficient and reliable?

[@kiranali4898]

I would love these videos I learn so much

[@AnonymousRepair]

Great video and very good explanation

[@joeyholthusen6495]

Ever worked on a soundstream human reign amp? Tell us about it, very curious.

[@pradeepsuryawanshi7157]

How are you? Why you not making any videos,is there any alternate channel you started

[@SaltwaterBoogeyman]

Wonder if this board is coming in the oxygen series from Wolfram

[@user-vq4ed6lh5t]

Thank you

[@7thfloorisnomoreq790]

How did you learn so much about amplifiers? Did you have any electronic experience before?

[@barevids]

Trial and error buddy! Perry's amp repair guide from bcae1 was a good starting point ☺ 4 years ago I had no idea what a mosfet was and my soldering looked like a crusty burnt soup

[@everetthawp7761]

Do any fellow bassheads in the comments have any amp/subs just laying around that they can let go of for cheap? I have very little money due to my living situation but I can always try to hustle something up!.anything would work at this point because I only have a factory radio in my car/house....thanks in advance and God bless

[@rashad5286]

Yo quick questions. i get a high pitch wine coming out of my door speakers (powered by a Rockford fostgate 4 channel) when I connect the rcas to my Sub amp ( Digital Designs M4B) The noise is still there even with the engine not running. Any help would be appreciated.

[@barevids]

You have 3 options. 1) Connect the speaker negative of the DD amp to a speaker negative of the Rockford amp. MAKE SURE ITS ACTUALLY A NEGATIVE some will be marked as positive due to bridgemode. You want a negative terminal that is not marked as to be used for bridge. This will lower your noise but may not get rid of it completely. 2) install a ground loop isolator before the bass amp. This should kill the noise completely. 3) decouple the rca and output ground inside the DD amp. Unless you're familiar with modding amps... Don't do this. Go with option 2.

[@rashad5286]

@@barevids Thanks for the quick reply bro :) . I've repaired a few amps but i rather not modify this one. I'll look into options 1 and 2. Is there any ground loop isolators you recommend ? I've heard some have adverse effects on frequency response but i dont care as long as it doesn't effect 80hz and below.

[@barevids]

They're all pretty much the same buddy but go for one by a known brand

[@yzcrkxrm1]

Is the arc audio xdi600.4 one of these type?

[@k.i.doublel6673]

Damn bro. U got this shit down! U really know ur stuff. U really opened my eyes to the internals of a powerful amp. I have a rockford fosgate 801s and it needs repairing. Can u help me out?

[@theinsaneunknown]

Hey Sam, I have a Sundown SFB 8000d. Do you have any experience with SFB amps yet? If so, what are your thoughts?

[@barevids]

none in the uk yet buddy

[@theinsaneunknown]

@@barevids How much would it be to ship it to you for an analysis? You could even make a video if you wanted.

[@NickProcktor]

i’m wondering if you should try and reduce the value of those gate resistors on the output to see if you can reduce the heating problem. Try 15R amd see if it makes any difference.

[@barevids]

I have done, and no difference ☺ also tried some diodes in series with gate resistors to pull drive down faster and no difference

[@NickProcktor]

@@barevids This type of thing can also be a PCB layout issue, for example longer traces cause unwanted inductance which can create a low pass filter with the Cgs of the FET and create the slow rise/ fall times. Not much you can do about that, though (unless you beef up the traces going to the gates or add wires in parallel with those traces, which would be a bit shite). I enjoy your videos, cheers.

[@barevids]

It would be interesting to experiment with, but I'm not doing r&d work for them for free 😁 haha! Interestingly enough, with lower Cgs fets there is no heating issues what so ever. So definitely something like how you mentioned.

[@rock-kennychristie8165]

which amp is the best to go with when buying

[@patrickwhite3303]

I would love to get a amp repaired how do I go by getting in touch with you

[@f.a3202]

hey Sam, I'm trying to make my own amp but I'm stuck at how to use the tl494! please can you give me some information about this IC or a source where can i get some info?

[@barevids]

Tried the datasheet? 😂

[@f.a3202]

@@barevids well yeah, but the datasheet of the tl494 doesn't give a circuit for push pull like the ps of an amp

[@McTroyd]

The video might be 40 minutes, but not because you're waffling off on tangents! Chock full o' good info. Thanks!

[@omarserna1732]

Why does that driver board look like the Hifonics EOB-013-20?

[@barevids]

Because it's blue and has chips on it

[@toddminning3724]

I noticed a striking resemblance to the newly introduced Wolfram O-6000.1. I compared them side by side and while they MIGHT have different components it’s the EXACT same layout. I have one ordered on preorder and should have it in July/August. I hope they rectified the problems you pointed to. Is there anything I can do to prevent the problems you mentioned? Link to the Wolfram gut shot: cdn.shopify.com/s/files/1/1786/3821/products/[e-mail]?v=1585753390

[@barevids]

It's the same amp, and zenon are not doing anything to rectify the issues. You could skip the queue and just get one with a vibe, edge of DS18 sticker on it... Like I say though, you might be fine and it seems to be hit and miss as to whether you get a good one or not. It's just not a very well designed board and I would much rather have something like the banda Viking with very well balanced output circuit, lightning fast protection and health check mode, faster output switching frequency, etc.

[@kielthalin9888]

He said that was a Vibe BlackDeath M14k Amp (identical to the "new" Wolfram). You can lookup the history of that amp to get a clearer picture.

[@666nacirema666]

ive got the ds18 version and have used it fairly extensively for a couple years now. good amp really. doesnt exo run a big vibe ?

[@ruckusenclosures7034]

barevids well I preordered a 4K couple of days ago. Hopefully it doesn’t fail.

[@luke_784lowfrequency8]

@@666nacirema666 what's the model number of that DS18?

[@Sneakdisscommentbelow]

Couple questions if you have time, Hifonics has a new full range amp called the alpha line they make a 3k and my subs require 3k was wondering if this amp would be a better choice than a Sundown SFB "full bridge". Been out of the car audio seen for a while and I had a Hifonics Brutus 1600.1d thatI absolutely beat a set of Kicker L7S 12's d4s to death without any issues at 1ohm. Or should I go back with an older design Hifonics like I had before? Thanks!

[@barevids]

The amp you should be looking at is the Taramps Smart 3. Absolutely outstanding circuit design nothing like previous Taramps amps and they have brilliant customer service.

[@Sneakdisscommentbelow]

@@barevids Yea about that, so I ordered a Taramp MD 5000.1 and they just didn't send it. Was with this chick, she ordered it for me, we split ways and it never showed, contacted them and since I don't have the info they aren't budging. Just can't see myself giving them money twice, so going a different direction. Didn't want to explain that at first, kind of embarrassing.

[@Sneakdisscommentbelow]

Even ordered it from tarampselectronics on ebay.

[@barevids]

To be fair that isn't their fault. The Smart 3 is the best option in your power range and it's a great price, it seems a shame to buy a lesser product out of spite.

[@Sneakdisscommentbelow]

She didn't cancel or steal my amp bro, I wont let them get my money twice. If you could just tell me the better of the 2 I had in mind I'd appreciate it. Taramps is supposed to cover any lost in transit issues, I'm sure they make more money than me. It's 100% their fault in my opinion, they wouldn't even check my address or order info I do have , I just don't have the order number, if they don't store addresses and stuff electronically then that's just stone age stuff and they shouldn't be in the business.

[@eversoul43]

Brazilian amps have idk... a square frame looking thing with a cylindrical shaped object wrapped in yellow or orange plastic in the middle. Not seeing those in that Korean full bridge.

[@barevids]

It's just a transformer. The same as in Korean they just look visibly different

[@rowboyto156]

so is this better than brazilian full bridge? i want to try full bridge for a daily but they seem fragile

[@barevids]

They aren't fragile. Buy a banda that will be alright.

[@mrexon]

Tape white paper over the led’s will do magic

[@freethinker4liberty]

What in the world is a fullbridge amp? Can't find it on google lol.

[@Infanitunit1]

Do they have actual detailed low bass

[@middleclassic]

Whoa! 14:50 capacitors spewed their burnt guts

[@bbqdan78]

Im on the fence about buying my amps.old school cheater amps or new mono amp.

[@traceburnside1652]

Have you ever done a test a toro tech? I just bought the toro r5

[@nickn7939]

howd u like it? I was thinking about one, i have their fierce 6 sub

[@rigogarcia2479]

We're are you located I have a mojo 4 k that I need looked at I bought it used works but when I got home I looked at the guts and it has smoke and signs of being ran hard please contact me

[@E-raticWarrior]

You were not happy about this repair AT ALL and i get it.

[@sandeepsinghjagdev3485]

Is output of these transformers connected in parallel before rectifier section?

[@barevids]

No, each transformer has its own rectifiers. Parallel after rectification at the rail caps.

[@allenkibodeaux8574]

Where do you get your mosfets

[@bassmansl9596]

Nice

[@colorblind1983]

What brand amp is this?

[@Kilgorebass7]

Nicely done