Shea & Jason high gain mod Marc Huzansky's Marshall SV20H

Fun times back in the midwest, this year Shea and I rip into a SV20 head sent to us to go wild on by Marc from ‪@tone-talk‬
[e-mail]
headfirstamps.com
/ headfirstamps.jason
www.facebook.c...
/ moderntubeampevolvediy

[@heavybrett-al4082]

A pimped out Plexi , just love how you guys can maintain the original tones, but add extra and make it so versatile. Genius.

[@NitroModelsAndComics]

Now THAT soinds godamn electric! What a damn great mod. Kerrang for days.

[@jjcollins]

Wow absolutely awesome! Sounds Phenomenal! I know Marc is definitely happy with the outcome!

[@Joshua_Stephens]

Dope - Marc playing at the end... Classic

[@blakekilgore9815]

Congrats to Marc, Jason, and Shea! That thing has to be the angriest lunch box I've ever heard. Marc must be stoked. What an amp! 💯👍

[@abrackas1]

Sounds great! Why Marshall can’t put out something like this stock is beyond me!

[@PhuketMyMac]

Shea has a great workshop. He must really enjoy being there and made it so. Nice! Sounds killer. Love the camaraderie of you guys working on amps.

[@GeorgeWimmer-zi7gr]

Heiio Jason, thank u for posting this. Marc mentioned this on the last recent episode of Tone Talk. I've been looking forward 2 this. I recently met Marc at a local guitar store, and he is a class act, much like yourself. Thank you for all your hard work and please keep these videos coming,,, U R MUCH APPRECIATED!!

[@satchrules101]

This Marshall already sounded killer stock .. now it’s even better . I’m happy with stock such a killer little beast !

[@lyricbread]

7:04 Nothing like a little Winger playing while modding an amp. ❤

[@michaeltoren]

I got to play through Marc's amp recently, and it is absolutely awesome. Amazing job Jason & Shea. You guys really hit it out of the park!

[@K707OR30]

Sounds ridiculously good, nice work guys. Don’t think Marc has a choice but to be stoked on this!

[@tone-talk]

I’m very stoked!

[@DS-fv7tf]

Loved the Danzig and Wildside music in the background!

[@MaxPowersTastyTones]

Awesome Powerage Riffs! ❤ Love that sound man! 😍

[@Paul.1986]

Oh man you guy's hit a homerun with this one! Think i know what i want for my next amp. 🤘

[@gergelyboros8138]

Wow, my Sv20 needs that, also that Jaguar is nice😍

[@bobby_devil]

I just want to drive down and listen to Danzig w you guys.

[@peevee605]

It sounds absolutely phenomenal.

[@PerfectCircle91]

DAYYYUM the mini plexi absolutly RIPS fellas but I didnt expect anything less out of you two masters of your craft. 🤘🤘🤘

[@candydormizzi2500]

Killer as always these dudes know the tonez !

[@ScottyBrockway]

Sounds awesome! I want one.

[@adamfstewart81]

Same 🫢

[@ishancooper]

Sounds incredible! An even more flexible amp with all the original flavour!

[@robimiara7444]

Awsome sound from this little amp!! Good job kings of mod

[@nickm.9474]

That sounds freaking awesome!!!!

[@ITheFight]

Dang Marky your amp sounds bad ass!

[@martincockburn6821]

that sounds absolutely killer !

[@martincockburn6821]

how much are we talking for a mod like this ?? im in perth so would have to send it to you. and I'll have a play around with leons marshall you just did before i decide if i want to mod my sv or not.... but that just sounds like my kind of amp 🤘

[@JimsMusicJourney]

Wow sounds fantastic.

[@sgw1507]

"Super secret taper" you guys crack me up... amp sounds fantastic!

[@TechMetalRules]

Incredible!!!! I would love to have this done when I get an SV20 head soon! I'm in the USA, so I doubt sending it to Australia would be viable, haha... maybe I could send it to Monomyth or Ground Zero.

[@HeadfirstAmps]

Monomyth would be able to do this mod for you

[@TechMetalRules]

@@HeadfirstAmps Oh, sweet! Thank you!

[@BtR76]

That is so cool. I can hear definite AiC Facelift tones in there 🤘🏼

[@LPMojoGL]

I would consider picking up a SV20h just to have this mod done to it. Sounds great.

[@nigelcollins2507]

Great video man! That’s one angry little Marshall,love it👌

[@mattnagy2565]

Jesus holie chryst ... collosal tones! Acca Dacca too 😊

[@tonyleach5614]

I heard some old Night Ranger! Nice! Amp sounds killer!!

[@patricetrahan7287]

Man that sounds goooooooood!

[@maxvockner]

You 2 and Bruce should an all star amp building class next time your state side again! Keep up the good fight champions!

[@MRxr400]

even with just the phone mic, that sounded like the Marshall everyone wants. massive. for me, it sounded like the low input had a great rhythm gain level, and the high would be great for single note riffs and solo's. can it be switchable, i assume you'd have to have two masters, one for each channel.

[@MRxr400]

by the way, great seeing you get some notice over other youtube channels around the world. love your work.

[@fenwick_don]

Better to Mod this than a vintage late 60s version, for me I would make use of that extra 12ax7 and use both triodes maybe one being high GAIN BRIGHT and medium gain darker or parralell / series the two stages for relly crazy OD Distortion, I did my 1st mod on a Univox that way and it worked great until the old iron x-formers gave up and couldnt find R&Rs

[@PerfectCircle91]

Good lord I LOVE that single hum Jag. I need one NOW lol.

[@murrayguitarpickups9545]

Wow, sounds killer

[@jamescassidy4045]

It's a HeadMyth! Sounded ripping!

[@ThemFuzzyMonsters]

*jawdrop*

[@ironageamplification1791]

Super Badass. Amazing job!

[@LeonTodd]

Sounds so ch0nky! Loved the pot swap too

[@emersonmacedobr8482]

Man, this is awesome!

[@flightnarita4603]

Hello from Japan. This is jaw-droppingly great!! I wish you guys have JPN local dealers/distributers. ARIGATO for your nice video.

[@ringchamp6543]

That sounds so good

[@scoobydoo936]

Would be pretty interesting to hand wire that circuit, without a 5W mode. (This amp does need an attenuator for bedroom levels anyway) No chips, a turret board and the highest quality possible Elkos, Resistors, Pots etc. Figuring out the best layout and lets go. I think this thing would be a beast.

[@russoloco1662]

I've been to Lon Cheney's cabin up by Glacier Lodge out of Big Pine, CA. I grew up in Big Pine.

[@adamp2]

Sick

[@firemanmick]

The Marshall, Marshall should've made in the first place.

[@Fretburner1]

Would love to have this mod done to mine!

[@Burkhimself]

Crushing

[@ReinerCritides]

Need more Danzig riffs in your guys videos going forward

[@Counterkillify]

Yup

[@BrianSGuitars]

B-Town Blaster!

[@TavaresProject]

Holy heavy!!! That is a high gain beast!!! So I guess when you're in the low input and it's acting as a typical plexi and the master volume is cranked you can't really use the effects loop?

[@Monomythamplification]

You can use the fx loop on any setting the master volume is pre phase inverter.

[@Jarrodpimental]

Bad ass

[@IoannisHealingMySoulOfficial]

Congrats for the great job...how much does all this work of moddification costs for this model? thank you

[@CemSaydam]

Sounds great. Quick question. How's that different putting a new gain stage than using a booster pedal? Have you bypassed the bright cap? Can we say that it is now closer to jcm800? Thanks.

[@horrorview]

My god, these sound amazing. Any thoughts on any Headfirst JTM Studio mods?

[@tfrost33elkhunter]

Damn Yankees! Hell yes!

[@smellytele9629]

wait, are you in Bloomington right now??

[@HeadfirstAmps]

Back in Australia now, was there last 2 weeks of May

[@smellytele9629]

@@HeadfirstAmps ah man!! I would have loved to have had you guys do some restoration work on my '69 JMP 50 (if you even would have had time).BTW, the mod in that sv20 sounds KILLER!!! Is that something Shea is going to continue doing?

[@HeadfirstAmps]

I think so. You can reach out to him directly.

[@seanblythe9109]

So cool such great content as always

[@maxvockner]

Any reason not to paralell the extra triodes in the new gain stage ? Just to use all the triodes.

[@PerfectCircle91]

That thing sounds damn close to the legendary Bogner snorkler modded JCM800 that Jerry Cantrell from Alice In Chains used for Facelift and Dirt which speak for themselves in terms of filthy awesome tone. You fellas killed it, and with Jerry being my favorite guitarist I NEED one lol.

[@randyrhyne4903]

Danzig \m/

[@fritzhieke7209]

So is it switchable to the "normal" plexi gain structure if I want to or is the high-gain mod always engaged? And whta cost this pimp mod?

[@sonnyseabury4051]

I have this same amp, that I love. *****HOW MUCH WOULD IT COST ME TO GET THIS SAME MOD DONE THAT YOU DID FOR MARK HUZANSKY?********MUCH LOVE AND RESPECT FROM SONNY IN NEW ORLEANS, LA. PLEASE LET ME KNOW. I'M VERY INTERESTED, AND A PLEXI/MODDED PLEXI FANATIC.

[@HeadfirstAmps]

You're in the US, contact Shea at Monomyth Amps for details.

[@PerfectCircle91]

​@@HeadfirstAmpsYour a legend Jason with how you share your expert knowledge with us mere mortals lol. And how you are so solid for your friends sending work his way and not just thinking about money and your bottom line. I have family in AUS and NZ and when I visit them I'm coming by to shake your hand and you can't stop me lol.🤘🤘🤘

[@Skoora]

Pre phase inverter master?

[@HeadfirstAmps]

Yes 100%

[@RomanRotten]

Can you still use a normal channel for a clean tone after it’s been modded?

[@HeadfirstAmps]

Hmm, kinda. It will still have some hair on it

[@RozsaAmplificationLLC]

my first impressions is...I would Fire the engineers at Marshall!! for such a simple amp, there is way too much shit under the hood imo!! a collaborative effort, but Shae's DNA is apparent.

[@PerfectCircle91]

My thoughts exactly bro. WAYYY too much junk in the trunk lol. At that point it would be better to put an ST1 or turret in her so at least it will be serviceable for the next 50 years like the OGs still kicking around.

[@RozsaAmplificationLLC]

@@PerfectCircle91 I guess no one has ever heard of VAVE (Value Added Value Engineering)!! 😆

[@maxvockner]

Let’s here Freya by the sword

[@liamazael]

How do I get you guys to mod mine?

[@HeadfirstAmps]

Email [e-mail] or [e-mail]

[@Glensully]

So turn the gain down and put a pedal in front 😁

[@Leftlanedave]

That mod sounds tits yo🤘🏼

[@mrchrisbeaver]

That sounds fantastic

[@yomuthabyotch]

aite break it to me doc: if the guts of a studio-series marshall are pretty much identical to the guts of a mass-produced origin-series or a DSL-series, what did i basically pay for for my SV20--the namesake?? 😢 it is still the best amp i've ever owned, regardless.

[@HeadfirstAmps]

The headshell is a lot nicer in the Studio series amps.

[@yomuthabyotch]

@@HeadfirstAmps 😭😭😭