I Spent Weeks Modifying My Guitar Amp For BETTER Tones

I spent weeks modifying my guitar amp for BETTER tones. It turned this Marshall Origin 20 tube amp in to a monster using the Headfirst Sirius Amps replacement board. Here's exactly how I did it. 00:00 Start 00:13 Intro and Preamble 01:56 The Donor Amp 03:38 The Sirius Board 05:23 Parts and Price 07:17 Assembly what you need 07:59 Starting Out 08:46 Just for You 09:47 Originated Problem 10:05 Help from You 10:41 Start Simple 12:09 Important Point 14:47 Resistors & PCB 15:51 Fitting Capacitors 17:14 Caps Fitted 19:18 Spade Connectors 19:53 De-soldering Tool 20:52 Multi-pin Sockets 22:04 Wait for Parts 24:45 Closeup of PCB 25:18 Problems So Far 29:20 Control Panel 31:15 Nearly Complete PCB 32:16 More Procedures 33:26 No Standby? 34:07 Crazy Mistake 36:54 Unsolder Tool 37:33 Other Problems 38:28 Spade Info 40:51 9 Pin Sockets 41:22 No Power Control 43:47 Help Me! 44:39 Fit the PCB's 45:33 Front Controls 45:53 Knobs 46:24 EL34 Sockets 46:47 Socket Alignment 47:16 Initial Fit 47:42 Anomalies 49:38 Must Variac 52:23 Test Meter 53:38 Ready to Rock? 55:05 Solving Problems 58:40 Does it Work? 59:26 Test with a Dummy? 1:02:07 Problems Revisited 1:16:20 Last Fixes Standby 1:18:21 Lamp 1:19:18 Score 1:20:47 Re-cased 1:24:06 Plugged in 1:27:58 Played My website: https://tonymckenzie.com Headfirst Amps Website: https://headfirstamps.com/ Evolve DIY Amp PCB's etc: https://evolvediy.com/ Sirius Amps: https://siriusamplification.com.au/ Marshall website: https://www.marshall.com My original Marshall Factory Tour:    • Marshall Factory Tour | The Manufacturing ...   part 1 My original Marshall Factory Tour:    • Marshall Factory Tour | Part 2 | Testing &...   part 2 The BOM is not necessary as they made a new one! The Marshall Origin 20 amp is made in Vietnam. Let's say it's not quite one of the most modern amps out there, but in my opinion it is very price conscious and can be bought for around £400 or less in the UK. Its a perfect vehicle for modifying and I guess Head First Amps and Sirius Amps had a great idea. I saw the Sirius PCB being shown by Headfirst and ordered one as I like messing about with tube amps off and on. I think it would make a great project - and that's how it all turned out. I made various mistakes but the first Bill of Materials (BOM) did not help me. But I blundered on with it all and the BOM did cost me extra money overall. In this video I show you how I completed the project and ended up with a working modified Marshall Origin 20 amp. The finished version is a real monster for sure and if you play rock its a great amp. There 'might' be some clean in there :) So if you are wanting to either just watch the video and my antics (it IS educational) and the problems I created and fixed :) through the build then this video is likely for you. And even if you have 'no clue' about tube amps I hopefully take you through this build just as any 'ordinary' guy would, as opposed to those 'techies' approach. And I think that for ordinary guitarists with a little bit of soldering experience the project is not beyond the abilities of many - just heed the safety points I raise - and I AM NOT TELLING YOU THAT YOU CAN DO THIS. But I found it really educational and the result is ultimately that it worked! The finished amp can sound great as my cleaner style in my track shows, and Alan Bruce played heavier stuff. Sincerely I hope you like the video. This is a completely un-sponsored video and I bought every last Item myself - what you see could be you! And you could end up with an even better amp. But be warned if you neither have the tools or know how I recommend you don't do it! But I prove it IS possible. I want to thank the guy at Sirius (Alex) that helped me find the reversed multi-pin connectors I mistakenly fitted the wrong way around. The audio I played has really brilliant tone quality to that laid back track at 01:28:00 or thereabouts and Alan Bruce shows a more Metal track shows some metal tones at 1:30:20 I really liked the laid back tone - check it out. I will be posting a few things here later maybe or not. PLEASE SUBSCRIBE, RING THE BELL, AND THUMBS UP to give my channel a boost and thank you for watching - I hope the video is enjoyable for you and that you see the tings in it that other reviews NEVER show!. (c) A B McKenzie and https://tonymckenzie.com 2009-2025 All Rights Reserved. All Trade Marks Acknowledged Visit https://tonymckenzie.com for more incredible reviews or my YouTube channel #marshall #origin20 #guitaramp #guitaramps #guitaramplifier #headfirstamps #siriusamps #tonymckenzie #tubeamplifier #tubeamp #headfirst #guitaramplifier #marshalltubeamp #review #mods