The gun is always loaded, the horse always kicks, the dog always bites and the filter caps are always fully charged.
@buseini
8 жыл бұрын
And she will always love you!
@PrinceWesterburg
7 жыл бұрын
Unless the mains is disconnected and the standby switch has been on for more than 30mins.
@silasfatchett5693
6 жыл бұрын
I'm still going to check before I stick my fingers in there!
@silasfatchett7380
6 жыл бұрын
If you switch off the amp with the standby switch in the 'play' position, the filter caps will begin to drain via the tubes while their cathodes are still hot. The caps may discharge fully before the tubes stop conducting as their cathodes cool down, but they may not.
@timstanford3220
4 жыл бұрын
Always work on tube amps with one hand in your pocket.
@mickdavies1835
6 жыл бұрын
Clear. Concise. You have the the gift of a teacher.
@JDhomieG
10 жыл бұрын
Wow thank you. I feel a lot better doing the little things I do to my amp now.
@gavinj918
10 жыл бұрын
Thanks for debugging the filter cap debate.
@grooveshysta
9 жыл бұрын
With one hand in his pocket, the other should be giving a high five surely?
@keyboardtek
Жыл бұрын
I would add that on the old ungrounded tube amps there is a voltage potential to electrical earth ground and it depends on the AC plug polarity. Some old amps had a polarity switch to change that will reduce the shock risk. The way to test for a potential chassis ground voltage shock is set your multimeter to AC volts, in a range that can cover 120 volts. Connect one terminal to the amp's chassis ground and then touch the other meter probe into the AC wall outlet ground terminal. If there is a voltage potential you might see something between 50 and 100 volts AC. Changing the ground switch will reduce that voltage to a safe level. If the amp does not have a polarity switch then the AC plug's polarity must be reversed. This was a common issue with Hammond organs and the Leslie 122 and 145 amps. If the AC plug's polarity made the chassis hot with voltage, when someone touches the organ's metal chassis and their mouth to a microphone which is connected to a grounded sound system, they would get shocked. So I always checked for that leakage voltage when working on a Hammond.
@aloroki3350
Жыл бұрын
Hi. I want to get my first tube amp in future. Is it dangerous when you don't open it on your own, and bring it to the mechanic to do regular service?
@keyboardtek
Жыл бұрын
@@aloroki3350 Your question does not make sense to me.
@aloroki3350
Жыл бұрын
@@keyboardtek Sorry. I was asking can you get electrocuted if you just play the guitar plugged in tube amp? I mean if you don't open it up to change tubes and modify it.
@keyboardtek
Жыл бұрын
@@aloroki3350 If it is a very old tube amp that has a polarity selecting switch for a power switch, then you have the potential for getting a shock only if you are touching any metal on your guitar and also touching some other electrical equipment that has a proper earth ground. By only touching your guitar itself you are unlikely to get a shock. In the old days the guitarists that I worked with would hold the strings on their guitar and quickly touch the microphone they had to sing into with their finger. If they got a shock, they changed the polarity switch. Many found out the hard way when they first sang into the mic and got shocked through their mouth! Any new amps that have a grounded plug and no polarity switch does not have this shock problem.
@aloroki3350
Жыл бұрын
@@keyboardtek Thank you very much for explanation, it helped me to understand this. Have a good day.
@FrequencyRecordingStudios
9 жыл бұрын
Wood WILL actually conduct electricity if it is wet Sooo I would probably recommend the plastic chopsticks over wood just in case or at least a material that can't absorb moisture Great tut awesome sound nice to see in a world of horrible audio in video ! Cheers
@thilokaal
10 жыл бұрын
Nice one. Thx
@U2BER2012
3 жыл бұрын
Question for Kye: is it true that while discharging an amp, using your right hand, is safer because your heart is farther away from the path of current vs. using your left hand?
@MrDavidschloss
2 жыл бұрын
no
@RobSwindol
6 жыл бұрын
Also, does this information only apply to tube amps?
@radiodust
8 жыл бұрын
I only have 2.2K resistor - will this work safely in lieu of the mentioned 100 ohm resistor? Is the "2.2k" label on my resistors the ohms?
@ecstokely
8 жыл бұрын
+Jason Radcliff The 2.2k would be the resistance value. It would work but due to the much higher resistance the bleed is going to take quite a bit longer since it will slow the flow of electrons out of the Cap.
@silasfatchett5693
8 жыл бұрын
I calculated that to discharge 400V on a 100µF cap down to a safe 7.5V with a 100Ω resistor takes 0.04 seconds. Using a 2.2kΩ resistor would take 0.9 seconds.
@jim9214
7 жыл бұрын
Thanks Kye! You've convinced me! I'm gonna put my hand in my pocket to get my wallet out and hire a tech to do this for me. Thanks Man!!
@brianbouman661
7 жыл бұрын
Brilliant!
@chris-Ribble-Roots
9 жыл бұрын
Cause I've got one hand in my pocket, and the other one is probing a valve amp.
@nonh8nsk8r
8 жыл бұрын
If Alanis taught us one thing, it's safety. haha
@chris-Ribble-Roots
8 жыл бұрын
hahaha
@IronDave1985
8 жыл бұрын
I was waiting for this haha
@dreamrealitysyndrome
8 жыл бұрын
I've got something in my pocket for you. why don't you reach in and see what it is?
@Acoustasonic13
8 жыл бұрын
It's candy, I knew it. A rolo.
@katdeville
8 жыл бұрын
Thank you for doing a clear and concise how-to. You spoke at a rate slow enough for information to sink in, but not so slow as to be boring, and with a tone that's not at all condescending. I wish all instructional videos were like this. Thank you!
@bubsbarney3340
10 жыл бұрын
and dont use a pencil to poke around as the graphite can conduct electricity.
@brianbouman661
7 жыл бұрын
I wondered...
@timstanford3220
4 жыл бұрын
Wow I completely forgot about this , great point.
@torarnv
3 жыл бұрын
How is the chassis grounded if you've unplugged the amp?
@AA_MusicGuy1111
7 ай бұрын
This is what I don’t get yet people keep talking about it. For example how is the planet the biggest resistor or whatever he said if the amp isn’t connected to it directly? Where is all that voltage going to?
@123TheLightning1234
7 ай бұрын
@@AA_MusicGuy1111I’m not an electrician but I think in this case the metal chassis is the “earth” and that’s why you leave your opposite hand in your pocket so you don’t accidentally touch and become a part of the “earth” when discharging high voltage current from the capacitors.
@SCgroove
5 жыл бұрын
When you remove the doghouse cover that shields the array of power capacitors you can accidentally bump the metal box against the live leads of those caps and shock yourself. Do not flip an amp over and just remove that cover straightaway. There is a way to discharge those big power caps from the inside of the chassis via their connecting leads. It's always better to discharge them from inside. Also, if you're working on an amp with a standby switch, turning the amp off while leaving the standby switch engaged is also a good preliminary method for draining power caps ... but you'll still want to verify that there is no power by checking with your multimeter.
@ryanswanson6310
4 жыл бұрын
Question: using the dog house method was more about isolating the power caps from the signal path than "to protect you", right? In the same era you had at least Champs, Princetons, and Deluxes that had the filters inside the chassis, which leads me to think that the component layout of the Showman necessitated getting creative.
@silasfatchett7380
4 жыл бұрын
Notice how Kyle drew on his experience and was careful to lift the doghouse vertically, avoiding contact with the capacitor leads.
@somethingsomeonesaid6455
4 жыл бұрын
having replaced a filter cap in my marshall, I get ya.
@kornelijekovac9793
2 жыл бұрын
Best to use gloves :)
@AA_MusicGuy1111
7 ай бұрын
@@kornelijekovac9793what kind of gloves?
@yeps2468
10 жыл бұрын
"This... is a chopstick..." lol! Thats the best!
@stratplayr6997
6 жыл бұрын
I've never seen a red chopstick before - they're usually just natural wood color. Always good to have him tell you what it is, so someone doesn't think it's a metal rod. :-)
@probono9341
5 жыл бұрын
It was like, “This is a ...... chopstick. Am I going to fast for some of you?”
@kickpublishing
6 жыл бұрын
I followed this advice to the letter - but now I have chow mein in my amp
@tomcoryell
5 жыл бұрын
The President of The Internet Lmao
@jackhargreaves1911
11 ай бұрын
Thank you. You are an excellent presenter. I learned so much from this video (including what I was looking for in the first place). Your style had a lot to do with that. It’s an important subject for me because : (1) I learned the hard way about the need for capacitors to be allowed to bleed off. Not a nice experience… (2) my friend Pete was electrocuted for a long time (it held him rather than than throw him) because too-big a fuse had been fitted to an amp for the sake of expediency. He spent nine years (!!) in a hospital bed, as a result; (3) I saw the sad knock on effect on Alex Harvey (Sensational Alex Harvey Band) after his brother, Les was electrocuted and killed on stage while playing guitar for Stone the Crows. Many reports talk about him touching ‘an unearthed microphone’ but his roadie knew what was really happening and eventually managed to kick the plug out of the guitar amp (getting zapped and burned in the process because the thing was practically exploding). Poor Alex (an amazing front man) was never the same again after Les died. As you say, never underestimate a tube amp…
@tomreese8961
2 жыл бұрын
Is the amp really grounded if it’s unplugged? Shouldn’t it be jumped to a known ground?
@ghostrider2664
4 жыл бұрын
On second thought. I think I'll send my amp out to get fixed.
@The_Macaroon
2 жыл бұрын
Great video, but how can the amp be earthed when not plugged in?
@StraightRocketFuel
7 күн бұрын
ER doc here. You're absolutely correct that you don't want to complete a circuit, particularly across the chest. Where you're off a bit is why it's lethal (it has nothing to do with the valves). The heart is an electric pump with it's own electric circuits. Each time it wants to beat, the "pacemaker" of the heart sends an electric signal down the circuits. Once these circuits have discharged, they have to recharge to be able to beat again. There is a split second right after the discharge, but before it has started to recharge, where if you interrupt it, it can't start the recharge phase and you die from asystole, aka cardiac arrest. It can be interrupted by electricity or even by a hard impact (like Demar Hamlin). The electric shock can also cause a "short circuit", where the normal conduction system of the heart gets bypassed. This is bad, because without the "pacemaker" parts of the circuit the electrical activity can cycle incredibly rapidly (ventricular tachycardia), or can cause an "electrical storm" (ventricular fibrillation). V tach is almost always fatal if we don't hit you with the paddles right away (within a few minutes, typically) and v fib is most definitely fatal (within seconds to minutes) without the paddles. If any of these occurred and someone didn't call EMS for you immediately, it's game over.
@squireca
10 жыл бұрын
guru? who calls himself a guru?.....and I'm an amp super freak.....
@65Corvette
9 жыл бұрын
squireca Many top players in Nashville call him a Guru and so he adopted that name... You have to know him to understand
@minighs
3 жыл бұрын
I'm well aware of discharging caps and verifying their low voltage, but I recently had my amp opened up for some extensive mods for about 2 weeks. When I was done, I played my amp for a couple hours and then opened it up again. I started probing around with my electrical tape-covered chop stick (the result of irrational anxiety) for about 5 seconds before I realized I hadn't discharged the caps!! I have nightmares about getting shocked or setting fire to my current limiter, but since I had worked on my amp for so long without discharging the caps, I momentarily forgot to do it!!! That was scary!!! Now I have a big sign in front of my work bench to remind me on the off-chance I space it again!!!
@colinellicott9737
2 жыл бұрын
I've been trying to think of a way to mistake proof this kind of error - but to err is human ... I guess we're doomed ;)
@AA_MusicGuy1111
7 ай бұрын
This video is actually very reckless and can possibly get someone killed because it doesn’t clearly explain how the amp is grounded if it’s not plugged in? If so, should I it be plugged in? I don’t actually know the answer but many people ask and no one has answered and yet the video remains. Hopefully no one has gotten hurt
@tricko2286
8 жыл бұрын
Best explanation I have seen.... well done. I would add: Stand on a rubber mat and not a concrete floor.
@jeanlessage7560
3 жыл бұрын
Put boots on it can save your ass
@cardbored_
3 жыл бұрын
I’ve been standing on a metal floor is that OK?
@P3t3rPizzarelli
3 жыл бұрын
@@cardbored_ I've been working on my amps in the rain dressed like that tin guy from wizard of Oz. Will I be okay?
@omarcusihuaman4261
6 жыл бұрын
101 note: the amp must plugged in order to get the ground conection. In some countries there is no a standard conection to ground, so if you don't have any ground conection in your bulilding there would be dangerous to plug in your amp. You must have a Ground conection.
@jhs5150
6 жыл бұрын
A three prong ground. The middle prong is actually the ground lead.
@timstanford3220
4 жыл бұрын
But remember : at the electrical junction box the neutral and ground are tied together. Just a thought.
@gonzalozech
4 жыл бұрын
I came to the comment section looking for this
@clembaker
4 жыл бұрын
Good catch! Was hoping somebody had already mentioned that. Some shops have a copper strip or plate that is wired to earth ground, and you just connect the chassis to it via a test lead.
@amateurism1
4 жыл бұрын
Most important comment and correct. How do you move this comment to the top of the list? Unfortunately all the entertaining info, not good info, moves to the top-good thing I love entertaining KZitem comments.
@frankreiserm.s.8039
5 жыл бұрын
I also have 25 years of occasional work experience repairing electronics. When I was in electronics school (National Radio Institute), our very large TV stoped working. This was before my TV servicing lessons. I tried taking the cathode wire off of the CRT with just a pair of metal forceps (not a grounded flat screw driver). The shock I got make me feel like dying (literally). Another time I got shocked off of a large Lyden Jar that I made and charged with a 500,000 volt Van de Graff generator. As you know, the Lyden Jar is a huge capacitor, and the three inch spark hit my thumb, sending me to the hospital. Frank Frank Reiser Video/Audio Service
@ghostrider2664
4 жыл бұрын
And now everytime somebody runs the microwave you pee your pants right?
@bluealnico
6 жыл бұрын
Love this but I think you should reform The Proclaimers!
@ebeep
6 жыл бұрын
lol!
@joeseymour4073
3 жыл бұрын
😆
@paulkielt9301
5 жыл бұрын
When you dismount the chassis of your amplifier and you don't even know what's inside... why do you do that? I've been working on my amp for more than fifteen years now and I've been shocked three or four times, but it wasn't lethal because I know each component that's inside. There is always a first time! But with all the videos on the internet about amplifiers and how do they work, you have no excuses if you don't care about yourself. The first thing to do is to learn as many things as possible, before putting your hands inside an amp!
@drnemoali
10 жыл бұрын
As JusAequum asked. How do you know the chassis is grounded. I understand how it would be grounded if the amp is plugged in but if the amp isn't plugged in how is it grounded?
@shader26
2 ай бұрын
It isn’t. You are shorting the caps one by one to their negative lead. Just as you can short a battery and it drains it with no path to ground.
@timstanford3220
4 жыл бұрын
After making sure that the filter caps are discharged , double check it again . then check the ESR in those caps. ESR = equivalent series resistance. Also look for leakage on the outside of the cap .
@probono9341
5 жыл бұрын
In the intro, I thought it was a bit presumptuous that you referred to yourself as the Tube Amp Guru. However, I watched the video and believe that you accurately accessed your skill level.
@Krouwkaar
4 жыл бұрын
I didn't even dare to interrupt this video once
@steve-si3oz
4 жыл бұрын
Thank you! A lot of guys say to make sure the amp is safe before working on it but you're the only person I've found who shows how it's done.
@tonybp
Жыл бұрын
6:58 does the chassis need to be connected to the power outlet to connect to "planet" ground?
@Retro.Studio
5 жыл бұрын
Ok now it's become legal to walk around in my hobby room with a hand in my trouser..I always now can say "Hey I'm working on something"
@0013619511
Жыл бұрын
i am still scared
@ChristianKoehler77
9 жыл бұрын
You should also check the voltmeter itself before use. For example by probing a battery. Otherwise something like a broken wire can result in a zero reading even tough there is dangerous voltage in the capacitor.
@frankkolton1780
4 жыл бұрын
I once had a start capacitor blow on my well pump in the basement. It sounded as if someone fired a .38 down there. It went off like a party popper, there was about 10 feet of uncoiled brown paper on the floor. The crazy part is that it blew off the screwed down metal dog house that was mounted on top of the pump motor. They're powerful little things.
@philcollis100
2 жыл бұрын
I do this but here's what I've never understood... how is the chassis grounded if it's unplugged?
@msw812
2 жыл бұрын
Look in the replies of MarkV_SD’s comment. Silas Fatchett explained it perfectly. Chassis point(ground) is for continuity only for the task, and he talks about how the resistor discharges the caps. Leave amp unplugged. I believe it’s good to run this discharge process once with standby switch on and once again while off(but still not plugged into outlet). Saw another video explaining the standby details.
@sundaydiver
4 жыл бұрын
Very good intro to a total noob like me who just purchased his first used tube amp. Had no idea of the high voltages in there. I have great respect of household appliances and car batteries, but I used to believe anything related to stereo, hifi or guitar equipment was completely harmless in terms of the currents and voltages involved. Evidently, that is not so. :-) A couple of places could have benefited from more detailed information: When testing the fuse continuity with the voltmeter, what settings do I use? And when bleeding the capacitors, do I want the amp plugged into a power outlet or not? I'm guessing not, but how can the chassis be grounded when it's sitting on a rubber mat and unplugged from the wall outlet?
@kballs94
2 жыл бұрын
The capacitors are where the danger lies
@WutipongWongsakuldej
10 жыл бұрын
Well even if you put a hand in a pocket, the current still can passed through your body if you don't wear shoes and trousers (or have naked skin touches the ground during using probe). And that can cause you KIA :).
@susanjoy1969
3 жыл бұрын
So, we unplug the amp to test fuse....makes sense. When you refer to off-loading Cap charges to the "largest ground there is...Earth," are you implying that the amp should again be plugged in when properly discharging unwanted DC voltages as stored in Filter Capacitors? If so, that's a huge piece missing from the video. What would happen if I attached the other ned of discharge lead to chassis and it wasn't plugged into mains? Would it still dissipate? Where would the charge ultimately go?
@shader26
2 ай бұрын
That part was not explained well, or at all. No, you don’t need earth ground, you use chassis ground which also for example is connected to the negative side of the capacitor. Just like if you dead short a battery you drain it, same here. You are connecting the negative and positive of the cap which drains it.
@fireball1066
Күн бұрын
@shader: thanks for explaining. But if the amp is unplugged from the wall outlet, how is grounding the probe to the chassis any different from putting a screwdriver across the capacitor's contacts? Is it that the chassis has more resistance than a screwdriver and will drain the cap more gently?
@shader26
22 сағат бұрын
@@fireball1066 not 100% sure, except the “ground plane” then is not just one small contact point on a screwdriver. I think it’s way better to use ann anllogator clip to the chassis, a probe with a resistor on it, and touch the probe to the + side. Also some caps you can’t short with screwdriver.
@francisjoiner7248
7 жыл бұрын
thank you for keeping it simple! learning new stuff at 72.
@Slugg-O
8 жыл бұрын
Someone did a horrible cap job. @5:23
@rp2358
10 жыл бұрын
If the amp was unplugged, how can the case be considered a grounding point? The whole thing is floating. Don't the filter capacitors need a path to true ground in order to discharge correctly?
@FantaFuture92
10 жыл бұрын
Well i think you just unplug the power for testing the fuse (no fuse with power plug, no safety). Then plugging it in for bleeding the Capacitors. Correct me if im wrong.
@olifilipe
10 жыл бұрын
Yeahhh, How can you bleed the capacity to the big EARTH if the amp is not plugged to it?
@ironcut13
10 жыл бұрын
The chassis is connected naturally to earth, as your feet ! You can die even if you're not plugged, no ?
@FiveseveNp90
10 жыл бұрын
ironcut13 Well, you can die 30,000 feet in the air but that's besides the point. Most amps have their metal case connected to circuit ground, for shielding. Then the case becomes connected to earth when (properly) plugged in, for safety. If for some reason the case/chassis is not grounded, you can discharge the caps to some other poit at ground potential, like their negative side.
@ironcut13
10 жыл бұрын
***** their negative side are connected to the ground, as the chassis, so ...no matter if the amp is plugged or not
@fasnuf
3 жыл бұрын
I dont have a music amp but I do have an Amateur Radio HF amplifier with over 3000 volts and high current. Thanks for the help. Oh, I do play drums LOL
@PeterDad60
7 жыл бұрын
Your explanation about the heart valves being closed at the same time and then receiving a lethal voltage and your heart valves will never open again is the best WARNING ever. I will never forget it. You were right o the point, you did not imply I could get hurt, nope, you explained exactly how it could happen. So now I too will always keep one hand in my pocket while exploring/working on my tube amps. Thank you Mr. Kennedy!
@PeterDad60
7 жыл бұрын
On at least two occasions in my life I have had voltage run up my left arm and to the shoulder. I was young enough and reacted fast enough to disengage. The voltages never reached my heart. First time at around age 10 I stuck my finger in a lamp socket to see what would happen! Current ran up my arm. I was fast enough to pull my finger out. Second time I was trying to fix my friends car at night while it was running. I grabbed a spark plug and that DC voltage shot straight up to my shoulder. I was lucky that I was able to move my muscles and I was able to let go. I'm 67 now and I doubt that my reflexes are fast enough to disengage. A third time I pulled on a lawn mower spark plug wire and just got voltage into my finger tips. I am aware that sometimes you cannot disengage because the current is so strong that it locks up your muscles. That's how I envisioned being electrocuted to death. Now you have taught me that the current only needs to reach your heart while both valves are closed and that's all she wrote as they will never open again. Again I thank you Mr. Kennedy, Peter
@Thearcherfl
Жыл бұрын
Except it’s not accurate. The theory sounds nice and smart. However, completely wrong.
@CamRebires
3 жыл бұрын
I love tube amps, I love '59s, I love the crunch. But if there's one thing I love the most,... it's safety.
@chandrasekharthamire2995
7 жыл бұрын
Thank you very much for this tutorial! Not only was the content very helpful, but also was your amazing and methodical explanation (inspiring teachers like me)!
@david11ydg
5 жыл бұрын
Easily the most informative video I've stumbled upon for beginners.
@justinpaquette224
3 жыл бұрын
Does the amp have to be plugged in for it to be grounded?
@benmmurray
3 жыл бұрын
Check out Silas Fatchett's reply to MarkV_SD's question. The short answer is that the amp isn't grounded when it's unplugged, but by connecting the positive end of the cap to the negative end (via the chassis), you disperse the stored voltage as heat. The explanation in the video is technically incorrect, but the procedure in the video is correct.
@morganyoungisplayingdrums
5 жыл бұрын
I want to hang out with Kye for an afternoon. Eat pizza and ask a lot of questions.
@paulhetherington3854
2 жыл бұрын
Based on, TV tubes! Shaped charges-- or demo tubes! No-- the tube, is the fused-what? ID-- pilot tube.
@paystar3436
4 жыл бұрын
Are latex gloves unkown to you ? I am an OLD Electrician. Have seen so many actually not use simple safe activities and just guess ,,,,,, what outcome happened ?
@shader26
2 ай бұрын
Unless you disagree, there are amps where the filter caps are not accessible for discharge, for example when mounted on a circuit board that is on standoffs and they are standing caps. So if you have access to the schematic one can always find a point on the component side (usually resistor lead for example for the bleed resistors) and do th discharge trick there as well. Right?
@mauriciogambini
4 жыл бұрын
I was removing a preamp tube from my guitar amplifier and one pin broken (the other 8 are perfectly on the tube). Can I just removing it with pliers or there is a risk for getting electrical shocking ? Ps: all other components are set in their places. Thanks !
@HimothyOHooligan
8 жыл бұрын
When discharging the filter caps, wouldn't you want to clip the first lead to the negative terminal of the cap? You're not guaranteed that that node has a path to ground.
@Charlie_Chicago
2 жыл бұрын
Hopefully the people at where I bring my amp to have all this shit done know this stuff! Haha, I'm not digging around no godamn amp guts on my own. You crazy?
@Thearcherfl
Жыл бұрын
As a medical professional I can help here. Electrical activity in your heart is not a valve or anything related. The reason you can die from power is your hearts conduction system is interrupted. Your heart doesn’t shut and never open. It quivers and eventually will stop if not shocked back into rhythm. Don’t believe me? Look up r on t phenomenon.
@davidcorner1174
5 ай бұрын
Fantastic! Very well explained. Thank you.
@ryantoomey611
4 жыл бұрын
Another safety item to watch out for is people who use ground defeat plugs (2-prong to 3-prong adapters). This makes the amp really unsafe because if there is ever a ground fault or leakage inside the amp you can end up with 400+ volts on the chassis! Not a good thing!
@P3t3rPizzarelli
3 жыл бұрын
I was working on my amps in the rain dressed like the tin guy from wizard of Oz and fucked up when bleeding my filter caps and now I'm dead. Anyone know how to fix this?
@Asian_Connection
3 жыл бұрын
You look like a master. Can you just point me in the right direction? I have a Mark Levinson no.27 amp. When I turn it on I heard a strong pop on the right speaker and then the unit went into protection mode. Even time I turn it on after that the power switch would pop back to off. Same result with all cables off with only power plugged in. The power light still lights, fuse is good. Can anyone give me some guidance?
@freecitizen2760
4 жыл бұрын
I got zapped with about 140 volts yesterday. Note to self: always check each cap to make sure there’s no residual voltage.
@RobSwindol
6 жыл бұрын
Let me first start by saying "Thank You" for the video. Us Noobs around the globe are in need of such clear and concise information. That being said, I do have a very serious question, and then I'll explain why I'm asking said question. Both when discharging and testing the filter caps for residual voltage, can the ground lead of the same capacitor be used instead of the chassis of the amplifier? The reason I ask this question is, what if there's a broken ground circuit? If the ground circuit were to somehow break, then it would seem that using the chassis for your ground discharge and voltage test would give you a false reading.
@premierguitar
6 жыл бұрын
Hey Rob, this is from Jeff Bober, dude behind Budda Amplification and East Amplification who writes our monthly Ask Amp Man column: "Rob, thanks for your question. Yes, you can certainly use the ground side of the capacitor to discharge it. It's actually a good point and a good idea! " Best of luck and be safe!
@AA_MusicGuy1111
7 ай бұрын
What exactly is the ground lead of the same capacitor ?
@Redcattledog
Жыл бұрын
Thank you for the information, I got an electric shock tonight when I plugged in guitar so was looking up any help.
@Yupppi
3 жыл бұрын
Caps need to be replaced at least every 10 years? What type of caps? How new? Any data on this being a factual thing? Might be worth it noting that not only do you want to have one hand in the pocket, you don't want to touch two points simultaneously.
@alexhenderson8356
6 жыл бұрын
Who knew you could play pocket pool and fix an amp at the same time!
@yummyklown9226
Жыл бұрын
Best safety video by far! Great work guys! Keeping people safe and alive for 8 years!
@Stratomacaster
10 жыл бұрын
Great video. Nice choice of music up there on the shelf.
@jorgiewtf
4 жыл бұрын
I'm about to order a DYI kit and just anted to actually see this being done! Thank you!
@ryanshook8284
Жыл бұрын
How did your build go
@TimBrannen
10 жыл бұрын
+1 for Trower CD!
@jma8352
Жыл бұрын
i noticed the caps on the hp 23 power supply recharge up by themselves after disconected
@DandamanV
10 жыл бұрын
Something about the way this guy describes the dangers of working with electricity really makes you understand how dangerous it really is. I'd even not dare break his rules because he was so intimidatingly factual about how you can die doing this.
@BOTiTTE
5 жыл бұрын
Just the way he had his hands simulating a heart failing gave me nightmares lol
@JeffGarnerMusic
5 жыл бұрын
@@BOTiTTE Me too. I'm now terrified to even look at my amp!
@BeTheGuitar
4 жыл бұрын
I’m switching to drums!
@yournamehere7182
4 жыл бұрын
Great video, But there's still no way I'm ever taking the back off an amplifier😱
@lexzbuddy
5 жыл бұрын
Check out Uncle Doug's amp channel if you want to learn about amps
@KunchangLeeMusic
Жыл бұрын
How much pressure is required to replace a preamp tube - I tried wiggling in the new tube while applying gentle but firm pressure but it just doesn’t seem to go in - do I need to press in really hard ? Just doesn’t feel right cuz all the videos I see of people replacing tubes - it seems to be very little effort -
@annonuhm617
6 жыл бұрын
Doing this with the amp standing upright reduces the risk of dropping the screwdriver onto your brand new speaker.
@telecomex
6 жыл бұрын
Hello Kye, thanks for this advice. Your description of those two heart valves should make believers out of your viewers. I have had my share of 120V shocks, but have grown to be a lot more respectful of what's under the hood. Keep up the good work. Tnx from the west coast of Canada. - c
@simplyelectronic4840
2 жыл бұрын
i ma building a fender champ amplifire from scratch adn i ma also colore blind so i tend to not color code things because it is for the most part pointles. power supplies are a mess for me bu i think i can find a way to make things a little safer for me to work on. after this video i understand the importance of just simple makeing sure you know what goes where.
@robertmasiokas8752
2 жыл бұрын
Someone out there was talking about an amp where the standby switch was wired so as to disconnect the ground to the chassis I think. In that case when using the chassis as ground with the standby switch in the off position I think you neither drain nor can get a true reading of residual voltage. You ought to have a copy of and understand the schematic before getting in there.
@LeviBulger
Жыл бұрын
🎶 Cuz I got one hand in my pocket and the other one is discharging a filter cap 🎶
@EzyoMusic
10 жыл бұрын
Amazing video, extremely clear and easy to follow. Also very reassuring. Cheers!
@stiffiron
Жыл бұрын
I don’t understand. How is the chassis grounded? How do we know it is grounded?
@mengkokjo2346
3 жыл бұрын
teach me how to fix squiling amplifier,just us you hit the power on
@TangerineMagazeen
4 ай бұрын
cause ive got one hand in my pocket, and the other ones testing the filter caps
@willy42-03
3 ай бұрын
Is it the same with solid state amp ? someone told me that there is no risk of electric shock by capacitors in a solid state amp
@danabollinger4898
2 жыл бұрын
great video! thank you from october 2021
@russlora
Жыл бұрын
The energy is always on a hellbent mission to go to ground , So the shortest path it will find
@thedevilinthecircuit1414
3 жыл бұрын
Robin Trower's Bridge of Sighs, baby!
@6StringEraser
9 жыл бұрын
What happens if I only use a 1/4 watt resistor?
@MrUltraworld
10 жыл бұрын
This is really good info. If this was around 30 yrs ago, it would have saved me a lot of painful reminders.
@rockventures
7 жыл бұрын
"The fuse is your friend..." Excellent video - many thanks.
@bluesfrets3927
9 жыл бұрын
Great information! Good teacher.
@turbinexman
Жыл бұрын
What is the value of the resistor that you used? Thanks.
Пікірлер: 437