Turn your Marshall Origin into a Proper Plexi - REVISITED!!

Always up for sharing a better way of doing things, here's up update to the original mod that make the amp way more versatile. Also covering a lot if detail based on questions that have come in on this mod.
[e-mail]
headfirstampli...
/ headfirst.amplification
/ 225949122469679
/ headfirstamps.jason
0:00 Normal Channel Tones
0:42 Jumped Channels
1:13 Treble Channel
1:57 Treble Channel DIMED - High Power
2:25 Treble Channel DIMED - Mid Power
2:51 Treble Channel DIMED - Low Power
3:19 At the bench - mod tips

[@Paul.1986]

As the owner of this amp, having found Jason at Headfirst Amps on this channel, I can honestly say I couldn't have found anyone better to build me a Plexi mod. His work is first class and he is such a nice guy. Thank you once again mate! You're a legend and you're going to have the best Amp company in Australia 🇦🇺 ✌️

[@HeadfirstAmps]

Wow, thanks Paul!

[@okidoke-xe8gj]

people, buy the real deal (SV20H) ,not a bamboo Marshall and then spend hundreds of $ for a "Plexi fix"...totally BS

[@HeadfirstAmps]

You know the SV20 has all the same parts in it, same Vietnamese ‘bamboo’ transformers etc as you say. Anyway, the point here is to DIY. $10 worth of parts. Not total BS.

[@shredding51]

Your mods never disappoint! I really need to get one these Origins and try one of your mods. Freaking awesome! I figured you would be at Namm Jason 😉

[@HeadfirstAmps]

Other than the social side, and connections, it's hard to see the value for my direct sales model.

[@JohnHamnett]

Appreciate this update! Agreed that the bright cap on the push pull pot is way more useful! Sounds great as always. 🤘🏻

[@tonymccammon4599]

You the man Jason, going to mod my 1987 Metro Plexi because of you, awesome!

[@craigcornell2752]

Sounds great Jas! Thanks for going back through this

[@lechstryzewski9350]

Another great video Jason !! Thank you so much for sharing these with us !!

[@victorbeebe8372]

I would like to buy a Friedman or Suhr amp or maybe expensive Marshall, but it always nice to have options. When it comes to money I don't have

[@paroblynn]

Another great video Jason. Not just the playing but the content too.

[@BradsGuitarGarage]

Much more comprehensive! Good work, mate!

[@HeadfirstAmps]

2nd time always better! Thanks brother

[@BradsGuitarGarage]

@@HeadfirstAmps I keep getting asked about the Hotrod Deluxe video I did off the cuff years ago. Didn't even bother to finish it, as I had like 3 subscribers at the time. Now I hardly see them because either people are now fixing their own thanks to many vids, or they're all fixed locally.

[@jorbv8]

Yea man! That EVH Marshall tone👍

[@1thess523]

That sounds sweet! There's a Origin 50 going for $500 here in town.

[@void_snw]

DAMN when you max out the treble channel it sounds so sick. That pumping compression on attack. Tasty. I just delved into just putting a rotary switch to choose different bright caps on my SV20, but man now I wanna dive way way deeper and make it do THAT too! Sadly I'm not nearly as experienced in circuits :'D Just sick.

[@benburnett8109]

I've come to the conclusion that you are A) either really good at modding amps OR.............B) really good at mixing audio. Either way you have a skill set that is impressive. I am beginning to suspect that there may be something to this "tube magic"

[@HeadfirstAmps]

Tubes forever man!

[@markingleby621]

A & B actually

[@pjkpjk4709]

Killed it with What's Next to the Moon!

[@DreidMusicalX]

Sounds great! I was thinking about buying one of these heads but I am not amp tech so I would have to have it modified so I don't die. I do think it sounds great. But would it be worth paying to have it modified or just saving up a little more money, who am kidding, a lot more money and getting maybe 50watt 1987 plexi.

[@rikshredder]

@Headfirst Amplification can you direct me to someone authorized to do this mod here in U.S.? Sounds great as usual Jason!

[@billrogers3697]

They have a shop in Bloomington IN

[@rikshredder]

@@billrogers3697 They who? Headfirst?

[@Skoora]

8:11 good advice for any young man really.

[@tboneousmaximus7963]

I guess the goal of these mods (which sound great, btw!) Is to take what is designed to be a low gain amp and turn it into a high gain amp. I have so many questions, but the obvious one is if someone wants a high gain amp, why not just purchase one to begin with? It's like purchasing a Roland Jazz Chorus and modding it to sound like a dual rectifier. I don't quite get it. I admit that I am not a high gain player, and my Origin 50 sounds wonderful as is to me so clearly this mod is not for me but calling this a "Plexi Mod" is a bit of a stretch because I've played a JTM 45 and a Super Lead and though these mods sound awesome on KZbin, they don't sound like the Plexis I've played. I do enjoy watching! If I had your knowledge and skills, I would make the distortion smoother, butt I wouldn't dare add more distortion.

[@HeadfirstAmps]

Well, this mod turns the amp into a legit Plexi front end. You can get clean tones from a Plexi, and you can from this amp after it’s been modded too….and it sounds way better than the stock amp even set clean imho. Why do people mod Origins? Because they are dissatisfied with the stock amp, and modding it (especially if you DIY) is cheaper than selling and buying a better amp.

[@tboneousmaximus7963]

Thanks for the response! I guess I would like to hear the full dynamic range of the nodded amp. The only sounds i hear highlighted are super saturated Van Halen-like tones. Which, again sound great, but it seems like a one trick pony. Can we hear some edge of break up sounds for a change? How about a smooth woman tone? Richie Blackmore strat tone? A fat clean tone? Just a suggestion. As I think more about this, why would someone purchase an amp in the first place that they were dissatisfied with?

[@johnjames77]

@@tboneousmaximus7963 I bought an Orgin 50 because it looks good and was on sale . It can be what ever you want it to be.

[@BlakeC27]

Great information Jason as always.

[@HeadfirstAmps]

Thanks 👍

[@aminahmed2220]

What a awesome video have a wonderful day ❤😊

[@murrayguitarpickups9545]

Hey Jase, I decided I'm not ready to take on an amp build yet. I'm gonna buy an amp from Alex and if I build an amp I'll start with a 5 watt champ or something like that.

[@HeadfirstAmps]

My amps are too expensive huh? lol

[@murrayguitarpickups9545]

@@HeadfirstAmps haha...no but remember that Diamond Head that Alex bought and completely rewired? He's selling it to me for 650....I cant say no to that.

[@loue31bertram71]

ON FIRE !!!!! AWESOME

[@victorbeebe8372]

The axial cap replacement at 25 min into video at right side of main board, could iy be stood up? Too tall or leads to short?

[@HeadfirstAmps]

You could stand it up, ground side exposed.

[@glaucosantiago]

Hi Jason, the replacement of the C27 blue Cap on the V3 worth 47pf in the review still necessary?

[@edwardgrassel872]

where do i find someone in the states that can do this kind of quality work

[@leohobbleohobb3781]

The push pul switch after plexi mod with potmeter, is it another pot with switch i have to buy or is it the one disconnected and reused? audiotaper pot i heard. the second volume where the til pot is/was also a different pot or just rewired? and where can i get them. do not use Facebook. But found some on the origin 20. i will do the full pexi mod and change some resistors like the hvite ceramic ones and the 2 watt underrated resistor said to be on the limit when at high power setting. is a rep video about this on u tube. Restoring a Hagstrøm Bass 210. fun small amp.65 model.

[@soapboxearth2]

Would this be the same procedure for the 50 watt ?

[@HeadfirstAmps]

Yes

[@soapboxearth2]

@HeadfirstAmplification thanks Jason!

[@bgingras05]

Have you done the mod yet on the 50? If so how did it go?

[@soapboxearth2]

@bgingras05 I haven't, actually. I have decided to gut the amp and handwire something like a 1987 circuit in it. I noticed some red plating in the origin, and when I turned the bias trim pot , it malfunctioned. So it made up my mind pretty quickly. I'm sure the mod works great though.

[@bgingras05]

@@soapboxearth2 yeah I'm torn what to do with my 50C, I just wish it had a little more dirt from the factory. Thanks!

[@LollygaggerFX]

Or heat the leads and tap the board and most of the time they fall out.

[@swmorgan515]

I have a couple Origins and I'm pretty happy with them already. What is the benefit of this or other mods?

[@michaelmarchei8539]

Sick playing dude. You shall be rewarded with a copyright infringement 😂😂

[@HeadfirstAmps]

Haha, thanks!

[@strumminronin]

Yes, no good work goes unpunished 😂

[@andyfogarty2230]

Hi Jason, what is the knob configuration to play normal channel only please? Guessing high treble to 0 but the push/pull? Thanks Andy.

[@HeadfirstAmps]

Just set the treble channel to 0. The push pull is for the treble channels bright cap.

[@bryanwilliams3665]

Hi Jason, for a "Core" Plexi sound being say a Live J Page (Madison Square Garden)or Maybe Angus (Back in Black) tone, do you have a Preference for one Origin over the other (50 vs 20) once your 'Magic' has been performed? Great vid btw.

[@HeadfirstAmps]

A 50 will deliver voltages that are on spec with a 50 1987 model Plexi. The 20’s voltages are too low for that, and are therefore naturally more ‘brown’

[@bryanwilliams3665]

@@HeadfirstAmps Thanks for that Jason. On a "simplified" level, I take from that the '20' would lend towards the Browner EVH 1 while the '50' toward the Page/Angus flavor while anything may be possible with Mods and Dollars??

[@kxmrock]

These New are only $430 at Sweetwater, $120 price drop

[@OperationEndGame]

Hey J. Is that a pair of Thornbuckers on your Suhr?

[@HeadfirstAmps]

Yes

[@bobdillon1138]

How accurate is the hand drawn schematic for the origin20?

[@HeadfirstAmps]

It’s ok…but if you search a bit you might find the real one

[@bobdillon1138]

@@HeadfirstAmps Hey thanks!... can't find the real one found one by Matec looks professional is that one ok?

[@TeensierPython]

Why is your amp the “wrong” color? I’ve only ever seen them in black.

[@HeadfirstAmps]

fivestarmusic.com.au/products/76-ori20h-cream

[@TeensierPython]

@@HeadfirstAmps dang. At least the black one should sound the same. Just not as unique a color

[@martinallott572]

Hey there! Would you do the mod if I sent one in? Or is there someone I could send it to. I'm in queensland.

[@HeadfirstAmps]

Yes. You can email me at [e-mail]

[@killer268]

Hey man, are you still using 470k resistors on the channel volumes like in v1? These look different here.

[@HeadfirstAmps]

Yes, standard plexi circuit

[@killer268]

@@HeadfirstAmps thanks brother.

[@user-tb9rw7dh2t]

🎉

[@Superunknown2014]

Could you answer a question please sir. I just bought a SC20H 220v from the UK. I really want to use KT88s, I put 2 in but the other day but they lack a bit of gain, I guess due to the biasing. I am told I would need to get them to bias hotter for that. I am learning that the bias though is done by the resistor making them run cold, but by putting a 5w 68 ohm in parallel with the bias resistor, I could get hotter safely. Is this the route to go sir?

[@HeadfirstAmps]

Why do you want KT88s in that amp? Honestly I can’t see the point. If you change the bias to make it pull more current at idle you’ll likely burn out the power transformer sooner or later.

[@Superunknown2014]

Ummmm kidda rude response from you WOW. And yeah WHY -- because I want to and like there sound. That’s why I’m asking if the 68 ohm would still keep it in a safe range. I know it can be done but I was because I have saw it done, I expected a more professional response. Thanks I should have looked for advice elsewhere.

[@HeadfirstAmps]

Sorry, not trying to be rude. Just trying to understand why, because tubes don’t really have sound - but the circuits they go into do. Sorry for giving out free advice.

[@Superunknown2014]

I respectfully disagree with you tube change the sounds to a same as a mod does. Thanks

[@HeadfirstAmps]

kzbin.info/www/bejne/jqXViGZjmZiJZ6csi=tv5hpSah87tKdwhS 10:30 mark

[@blickfang3751]

Hi there Jason. how much would you charge to do this mod?

[@HeadfirstAmps]

Hi, you can email me [e-mail]

[@stringlocker]

Hurry somebody call Marshall😂

[@Glensully]

But I have a 50H….

[@mattskillman]

Jason did a video for that too.

[@chrissanders8362]

Its a disgrace to Marshall for building amps that a guy in Melbourne has to fiddle with them to make them sound like a proper amp...

[@joshmuz9018]

Sounds muddy and mushy on the bass and piercing treble on the high end. Why bother modding it, it’s clearly a dud of an amp no matter what you do to it

[@letsgofuckingcrazy]

Someone know if it's possible to bypass the speaker sim but still have the Di out option with no speaker, so I can use my IRs?