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The Guitar Amp Tech
Australia
เข้าร่วมเมื่อ 26 พ.ย. 2018
Hi. I am Chris, The Guitar Amp Tech, working in Sydney, Australia. If you have a vintage valve amp, a modern valve, or solid-state amp, I will get it back to sounding its best for you.
I have some famous customers, but most are weekend warriors, like me, who are just as passionate about their sound. I also do repair work for major Sydney music stores.
There are a lot of myths in the amp world. I will do my best to address them as we cross them. Likewise, if you think I’m talking garbage, let me know.
I did my Electrical Engineering degree at the University of NSW. When I was 17, repairing my amp was my major goal in life. In some videos you can see that first bright green paneled Savage amplifier. It still doesn’t work!
Every 2 weeks I will be uploading videos of my more interesting repairs and offering some insights along the way. Some videos are short, some silly, and some detailed. It depends on time between repairs and the amp which inspires me to press “Record”.
I have some famous customers, but most are weekend warriors, like me, who are just as passionate about their sound. I also do repair work for major Sydney music stores.
There are a lot of myths in the amp world. I will do my best to address them as we cross them. Likewise, if you think I’m talking garbage, let me know.
I did my Electrical Engineering degree at the University of NSW. When I was 17, repairing my amp was my major goal in life. In some videos you can see that first bright green paneled Savage amplifier. It still doesn’t work!
Every 2 weeks I will be uploading videos of my more interesting repairs and offering some insights along the way. Some videos are short, some silly, and some detailed. It depends on time between repairs and the amp which inspires me to press “Record”.
Can we make a Champ LOUDER? Results Revealed & a Life-Saving Check You should not miss
In this second and final part of the Champ investigation “Can a Fender Champ be made louder by simply swapping the 6V6 power tube for a Marshall-esque EL34?” What do you think? Watch the tests and the calculations to see if you are correct.
Stay to the end to see a potentially catastrophic wiring error and a simple check that you can do to see that you are safe. Once you have seen this technique then PLEASE CHECK ALL OF YOUR AMPS.
NOTE: If your amp has the power switch wired before the fuse (wrong!) make sure that the amp’s power switch is ON. Do I really need to say UNPLUG YOUR AMP BEFORE YOU DO ANY WORK OR TESTS?
Video Index:
00:00 Introduction
01:00 The readings we will be taking and the Equations we will be using
03:40 Let’s start taking readings for the EL34 and a 5U4 rectifier
04:30 Use oscilloscope to measure power output at the speaker with EL34
05:40 The results for the EL34 / 5U4 combination
07:20 Let’s start taking readings for the 6V6 and 5Y3 rectifier
09:50 Use oscilloscope to measure power output at the speaker with 6V6 / 5Y3
10:10 Why did a purist change the first dropping resistor value?
13:10 Let’s find a better value of the Cathode bias resistor to balance power dissipation and tone
13:50 What fuse value should we use?
18:38 A DANGEROUS WIRING MISTAKE.
20:10 PLEASE DO THIS SIMPLE TEST ON ALL YOUR AMPS. IT MAY SAVE YOUR LIFE.
21:20 The Sound Tests: (1) Clean and (2) Dirty
Stay to the end to see a potentially catastrophic wiring error and a simple check that you can do to see that you are safe. Once you have seen this technique then PLEASE CHECK ALL OF YOUR AMPS.
NOTE: If your amp has the power switch wired before the fuse (wrong!) make sure that the amp’s power switch is ON. Do I really need to say UNPLUG YOUR AMP BEFORE YOU DO ANY WORK OR TESTS?
Video Index:
00:00 Introduction
01:00 The readings we will be taking and the Equations we will be using
03:40 Let’s start taking readings for the EL34 and a 5U4 rectifier
04:30 Use oscilloscope to measure power output at the speaker with EL34
05:40 The results for the EL34 / 5U4 combination
07:20 Let’s start taking readings for the 6V6 and 5Y3 rectifier
09:50 Use oscilloscope to measure power output at the speaker with 6V6 / 5Y3
10:10 Why did a purist change the first dropping resistor value?
13:10 Let’s find a better value of the Cathode bias resistor to balance power dissipation and tone
13:50 What fuse value should we use?
18:38 A DANGEROUS WIRING MISTAKE.
20:10 PLEASE DO THIS SIMPLE TEST ON ALL YOUR AMPS. IT MAY SAVE YOUR LIFE.
21:20 The Sound Tests: (1) Clean and (2) Dirty
มุมมอง: 3 237
วีดีโอ
WTF! A Champ with an EL34. Is it louder? PART ONE
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Ever wondered if swapping a 6V6 with an EL34 in a Silverface Champ would crank up the volume and give it that Marshall roar? Join me as we dive into this experiment and transform this little fella into a real Champ. First, we'll tackle the current faults, and along the way, you’ll pick up some handy tips. Video Index: 00:00 Introduction 08:07 Rectifier Options - including the Weber CopperTop 11...
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The JMP50 is my favourite Marshall amp, both the 4-hole (4 input sockets) and 2-hole versions. I hope you enjoy this journey of repair and improvements to this classic. You will learn about a “Cold Clipper Stage” and how Marshall (and others) create a flexible, but potentially flawed, cascading gain stage. Or skip straight to the 43:00 to hear how this historically important amp sounds. If you ...
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This King is sick. Long reign the VibroKing.
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