It doesn't get said enough here, your playing is KILLER!
@HeadfirstAmps11 ай бұрын
Thanks brother, this makes my day :). Especially coming from you
@belligerentamateur11 ай бұрын
Wow, this nakes me REALLY want to grab another SC20. Already thought it was an awesome amp in stock form but this just sounds ridiculous, excellent work Jason!
@HeadfirstAmps11 ай бұрын
Thanks! They are cool amps for sure.
@benburnett810911 ай бұрын
Jason, Would you consider a video describing your soldering tools? A video where you give detailed instructions on selecting a soldering iron, solder, and the steps to solder properly? I build and modify guitars. Tim From TNTones pickups custom builds pickups for me, and I would like to be able to solder to volume and tonepots correctly.
@BlakeC2711 ай бұрын
Thanks as always Jason for sharing your knowledge and expertise.
@HeadfirstAmps11 ай бұрын
No worries!
@adamswanson82163 ай бұрын
Don’t play it very often but I still have my Zach Wilde signature JCM 800 head from some years ago and truly it’s amazing. It has the 6550 tubes in it and I can tell you the tones are amazing. I had to put a $700 attenuator on it to make it right lol but when I use it, it is fantastic, but I have truly found that with Friedman I get everything I want of these tones from my Jake E. Lee head and also I use the dirty Shirley so between those two amplifiers it pretty much covers all of my major tones and the JC 800 side of the Jake Lee signature 21 ahead is amazing and compared to this don’t get me wrong. I love Marshall and I broke my heart to switch. I still have my silver jubilee. I just won’t let go of that and I have my signature Bernie Marsden 74X and my Zack Wilde those things are important to me and I’ve had them some of them for years. I’ve been playing guitar for 37 years and there’s nothing I love more than that JC 800 but truly Friedman has changed the world as far as I am concerned, and I am happy about that change the hand wiring. The tones are incredible, thanks for a great demo though. It is a nice one sell 5:52 5:55 5:57 5:59 6:01
@batpigguitar11 ай бұрын
That sounds KILLER.
@brucetaylor17539 ай бұрын
Wow. I just purchased one of these yesterday. I will definitely be doing these mods. Thank you!
@crflores7611 ай бұрын
Awesome tones, congrats Jason… you doit again!!!
@HeadfirstAmps11 ай бұрын
Thanks!
@ryanlucivero959810 ай бұрын
You knocked it out of the park, mate! So much more versatile than stock with plenty of gain on tap. Absolutely love my mini jcm 😀
@omarheavy200911 ай бұрын
Thanks for sharing this man!!
@lechstryzewski935011 ай бұрын
Awesome stuff Jason ...... as they all are man !!! - Thanks for sharing with us - Cheers
@HeadfirstAmps11 ай бұрын
Thanks for watching!
@lechstryzewski935011 ай бұрын
@@HeadfirstAmps I just so happen to have a second SC20H (other hhan my main SC20H) .... still in the box ..... that I bought about a month ago. Absolutely crazy deal that I couldn't pass up. I got it for $800 and it's like brand new !! - As soon as I get my '75 1959SLP off the bench - I may just have to apply this mod to the 800.
@terrydemol535411 ай бұрын
Jason, nice mods, the SC20H is a great little amp that is well made, reasonably priced and a good platform to work with. A few tips -> the 68k R at IP just adds noise, more than 2 x that of V1 itself. You can make it a lot smaller. The 470pF LPF cap on follower will have a corner freq of well above 100k(Hz), remember it's a follower = low impedance ( 1/gm).
@HeadfirstAmps11 ай бұрын
That 470pF works and is way less than 100kHz, theory aside. I use my ears.
@nestorcano435411 ай бұрын
Thanks for doing these videos!
@HeadfirstAmps11 ай бұрын
Glad you like them!
@Nightjar72611 ай бұрын
You make the best mod videos hands down. Great explanation, visuals etc. hats off to you man. Seriously good work. On another note, I can’t believe Marshall for so many decades was kinda just bamboozling people with these such cheaply made amps which weren’t even thought out well. I have nothing against PCB boards in the least. But the quality of these , the cheap potentiometers , components, etc. if their amps of the last 25 years didn’t have the Marshall logo on them, they would never sell any of them. I really wonder what the new company that bought them will do now. Anyways. Great work man. Super work
@HeadfirstAmps11 ай бұрын
Thanks brother! Will be interesting to see what happens with Marshall with the new owners now in place.
@shredgd511 ай бұрын
Sounds great!
@alexeloi1563Ай бұрын
Thinking about all the costs reduction they made in the amp, I would first undo these reduction costs by changing all the cheap parts in to real quality ones... mods... maybe include a clean channel and a spring reverb... maybe.
@donnyboy9113 ай бұрын
great vid...gotta try some of these mods
@jaykafcas434210 ай бұрын
THAT is where the money’s at. The NFB🎯. Spend as much time as it takes to crack the code. That’s where I’ll be posting up.
@Burgschall11 ай бұрын
Whilst I love the MKT1813s for classic builds on Turret PCBs I prefer to replace the grey box with ERO/Vishay MKT1822. These are tonal in the same league as the MKT1813 (and a general replacement I use when I have a leaking/Dead Coupling Cap in more modern Marshalls) and do look not so displaced as the 1813 do in modern PCB Circuits.
@spiromandylor8 ай бұрын
Any upgrade recommendation for the transformer?
@felinekaiju451711 ай бұрын
I found desolder braid, and if it's beinf stubborn, i found a tub of flux (onviously not dumping the whole thing on) helps too. Although that took a bit of mastery so that it wouldnt mess up the board.
@HeadfirstAmps11 ай бұрын
Great tip, thanks!
@kylebarton64986 ай бұрын
I’m waiting to receive a 2500 mark iii head (900) and there isn’t a ton of info about it. I think it would be cool if you made a video where if nothing else you looked at the schematic and noted how much it differs from a 2204. Thanks! (Cheers)
@fatchoppers014 ай бұрын
Oooh Jel in background
@zandig66611 ай бұрын
I've got a sneaky suspicion I'd get this amp home and I'd still suck lol I liked the original tone the gain took the chime outve the amp with I love
@Burkhimself11 ай бұрын
Sounds killer…..does the amp clean very well with the guitar volume while amp is on the “highest gain setting on the switch” ?
@HeadfirstAmps11 ай бұрын
Cleans up ok, similar to a 2204 really
@lynyrddeville11 ай бұрын
Hi Jason, the amp sounds great! Would you say the way gain switch is similar to that which a lot of the Friedman amplifier line feature? I am curious about your depth mod as well. I think it might be a suitable mod for my Friedman Smallbox,
@shredding5111 ай бұрын
Please do a DSL20h :)
@HeadfirstAmps11 ай бұрын
When someone sends me one, it will happen!
@shredding5111 ай бұрын
@@HeadfirstAmps you’re awesome man! I’ve learned a tone from you. Thanks again
@dBoogieNights11 ай бұрын
Dankeschön aus St. Petersburg
@Guitarista7811 ай бұрын
Fan fkn tastic!
@hybridjohn111 ай бұрын
wow, super sounding head.
@hayabusa13001009 ай бұрын
Headfirst can you send me the parts list and maybe a few pictures of each point if you will had to see the screen I have one of these SC20H’s and would like to do this mod f I know all the specific’s I will order the parts I need from Mouser thanks man
@shredding5111 ай бұрын
Will there be pics of these mods on your website?
@Burkhimself11 ай бұрын
That 470 to cut a little treble, it goes across the top of which R on the board….is it R10 ? I’m playing with values…..I put a .1 over the top of the 10K and trying to pull a little more treble down…..
@HeadfirstAmps11 ай бұрын
Across the 100k (V2a). If you put it across the 10k you'll get more treble.
@distortedchannel102211 ай бұрын
Your playing smokes! Maaan
@HeadfirstAmps11 ай бұрын
Thank you man!
@shredding5110 ай бұрын
Could you use a mini toogle for the bright cap instead of a push pull pot? Thanks
@HeadfirstAmps10 ай бұрын
Sure
@shredding516 ай бұрын
probably a stupid question, but on the depth pot one leg of the 4700pf does on the wiper right?@@HeadfirstAmps
@cactus-mcjacktus11 ай бұрын
how’d you get the Knaggs?
@HeadfirstAmps11 ай бұрын
It's an Eric Steckel sig model, I bought it from a mate here in Australia.
@jaykafcas434210 ай бұрын
It sounds the best with no mods. While I get what your after, what happens in reality when the polish wears off the mod? Plug & play the raw Marshsll. I say get intuitive, bring something that doesn’t give the overdrive/boost sound & vibe. More Billy Gibbons less pushed for the same old same old same old….
@bradleywood149911 ай бұрын
Do you ever sleep, Jason?
@HeadfirstAmps11 ай бұрын
Haha, oh I do. 8 hours minimum!
@Nightjar72611 ай бұрын
Pardon. But depth knobs makes amps sound a bit hifi. No offense man. It’s just another opinion. Great work
@HeadfirstAmps11 ай бұрын
No offence taken! Can be handy for a vibe at lower volume, cranked up in a band context then dial it down…even to zero for a more stock sound.
@Nightjar72611 ай бұрын
@@HeadfirstAmps yeah it’s ok for low volume playing , agreed. Thanks for not taking offense. You can’t see inflection in text. Worst way to communicate. Great channel man.
@Nightjar72611 ай бұрын
@@HeadfirstAmps for a slight change from stock I usually like just a slight change to the V1A plate resistor to 120k or 130k from 100k stock for a slight bit more of gain and compression. It’s ever so slight but keeps the whole Marshall kerrang. And maybe a fat cap . Too much gain sometimes takes away from that kerrang Of course I should mention I did that on a low voltage 2204 from ‘78 which don’t lend to adding much gain because of the lower voltage. Mine was around 390v on the plates from what I remember. Just too low for more gain. Would get too mushy. Cheers