I wish I had teachers like you back in school

Uncle Doug. Your the man. I love your humor, easy going attitude and, great and easy to understand explanations

Uncle Doug, I'd like to thank you for sharing your incredibly valuable knowledge publicly. God bless you

the best use of electrical current as water metaphor I've ever seen...once again , beautifully done...Another opportunity for me , when asked an Amp question, to say " Go see Uncle Doug, and leave me the heck alone!"

I cannot believe that I *finally understand Ohm's law! Thank you! Drop in River Pressure on the down side of the Dam equals Initial River pressure times the hole in the Dam. V = I x R - the stuff coming out of my 63 Fender Concert Output Hole needs to see speakers resisting at 2 ohms so I get my good sounding 40 watts. Proper resistance! - My amp circuit needs to be fed proper current in various places after the tubes... and RESISTORS dam the river for the proper flow. Wow. Thank you!! I took algebra twice in middle school, the first time I passed, but I wanted to get it (and enjoy it) the way I got math before that... so I took it again to get that A and to understand it. I love it... but I like Geometry and Trigonometry even better... because, in high school, I loved arguing and proving stuff. :-) Again... THANK YOU!

The practical calculations section is exactly what I need more of. Well done!

UNCLE DOUG! This is a great video! Thank you so much. I really wish I had been educated by teachers like yourself. I really struggled with math in high school. This video gave me a really comprehensive look into Ohm's Law and how you would use it in a real world scenario. I really appreciate the detail you go into with these videos and am excited to see the rest in the series. Wonderful! Thank you!

Thanks Doug, great video. Every evening i go to bed i look at least one of your videos. Thanks to your videos i have built great 5f1 with feedback switch and potentiometer. Now I am building bassman.

You ARE the man. I get the same vibe as I did as a kid watching Don Herbert,ie Mr.Wizard which is the sign of a great educator.

I sure wish KZfaq was around 50 years ago and you were my teacher. The electronics I had back then--all tube theory--was agonizingly confusing.

Hi Uncle Doug, I love your dry delivery of humour. It worth is as much in gold as the value of your helping/teaching methods in these videos and all are deeply appreciated by me. I know I was taught this at school but was a complete waste on me at the time. All the very best to you and those you hold most dear.

I failed Algebra 1 three times in high school... But... I started taking radio engineering classes and I finally got it. I just needed something to help all those variables make sense. Great video. :)

Ah, a fellow math teacher. I knew there was a reason I liked you. I was just going to comment that you were a naturally gifted teacher when you said that.

Yeah, beav shot were popular in 9th Grade. So at almost 70 I’m getting back to HS. This is one way to start feeling young again. Thanks Doug. Soon I’m gonna tackle the Vox V8 that no one want to touch.

You may have alienated Mrs. Haywire with one remark, but this tutorial is spot on. I may have been the wayfaring viewer who requested it. Thank you, and keep these theory tutorials comin'.

Same here If we had more teachers like you Doug , the world would be a better place , I was definitely guilty of beaver shot distractions ,well observed!!

WOW! I was wondering how all of the dropping resistors for my various B+’s were derived. Your video CLEARLY explained it. On one of my amplifiers the output transformer shorted and destroyed a very hard to get resistor block (or what ever it’s called) that was made up with 4 resistors in series all on one piece. I used my schematic to replace all of the resistors with discrete ones. And I wondered how the engineers figured out what dropping resistors to use to drop the voltages. Ohms law!

Many thanks Uncle Doug on ALL of your great videos. I've never been so excited about amplifier electronics and inspired to learn.

You took me back to Freshman Algebra in 1962! Thanks!

This is the best breakdown of Ohm's law I have come across on the web. Awesome job. I would like to send you over some hand made wire wound resistors for you to use in future videos, on the house, if you would be interested. Just let me know what you need and I will get it shipped out to you. Thanks again for the awesome video, I look forward to seeing more.

I found your videos while researching about building a speaker cabinet this summer and I can honestly say that your videos were the primary reason that I was able to do so well with my build. These videos always contain very in-depth descriptions and instructions on the video topics. Also these circuitry videos are helping to cement some of the concepts I'm learning in my Circuits 1 class right now. Thanks so much Uncle Doug & Rusty!

This stuff never gets old. Thank you so much for sharing. Cheers

Oh wow, I must have been hunting beaver! I'm going to have to dig deep for this one & and watch it twice. But you are an awesome teacher Doug!

For me this series is a "grand unveiling", I sure appreciate your time to make them.

Aloha Uncle Doug and Rusty, from Honolulu! I have enjoyed all your videos so far, and this was a great review of the fundamentals. It's always important to keep in mind how and why to pay attention to the amps and milliamps with the proper decimal positions. I recently acquired a very dusty and scratchy sounding but playable 8 watt MUZAK P.A. amplifier, and after lifting the hood, i discovered 2 6V6's in push/pull,, 2 6SL7's, and a 5Y3 rectifier. Apparently, it was used to deliver the morning announcements at a local high school. A little research told me that this circuit was very similar to the early 50's Fender Deluxe series of circuits, such as 5A3, 5B3, 5C3, 5D3 and the most famous of all, the 5E3. So your videos have given me the knowledge to trace the circuit, and plan on a restoration. And I'm watching out for the "Death Capacitor" as well! So cheers to you!

Thank you for sharing these series of videos! I'm watching and learning. Cheers from Italy!

I wish Ohms Law was explained like this when I went to electronics school! :) Another premium video.

Every time I watch one of your videos I have to go out a buy a bigger hat and my brain expands so much from the knowledge. Thank you so much for the time you've taken to put these videos online. You're a true treasure to the electronics community!

Growing up, one learns to value knowledge and understanding.... Again thanks for taking your time to share and teach.

I love how you show the practical application of the things you've explained. This is exactly what I needed, thank you!

Thanks again, Uncle Doug, your instructional style is impeccable, no doubt borne on many hours in the classroom! Your students, (myself being one) are very lucky to have you as the instructor. God bless you for sharing your knowledge and experience with the KZfaq community!

I have seen almost every video that you compiled. Your explanations got me curious on building my own amp. You make it sound understandable and applicable. Thank you for sharing and caring! All the best to Rusty, Jack and Doug

Mr. Doug, excellent videos. You are an excellent teacher. I am sure you are fully aware of this and don’t really need some random dude on the internet to tell you this. But I have to just say that I have unending respect for people such as yourself that can teach others in such a clear and interesting manner. I wish you were my algebra teacher when I was in Jr High School. I would have learned the subject much more throughly - beaver shots notwithstanding. Thank you for these videos.

Great video Doug it is a real help for a novice like me , and it looks like I`m about six years behind by the date on this one , but still glad to be watching. Thank you.

Doug, I'm going back all of your "basic" videos -- resistors, capacitors, etc. I am able to apply most of what you show in your videos to my ham radio hobby. I have worked in electronics, but most of my experience is in ham radio. No matter how long someone has been in electronics, I think it is good to go back once in a while and refresh oneself in the basics -- basic theory, Ohm's Law, basic components, inductive and capacitive reactance (remember "ELI the ICE man?"), etc. And even THE most basic of basics (at least according to my Electronics 101 instructor @$#&! years ago!), his quote -- "You can't have electronics without the electron!" I thoroughly enjoy your videos, Uncle Doug. And I absolutely love your cat, Jack... a very nice kitty! Keep your videos coming, I'll keep watching. :-)

I love your videos Uncle Doug. It has taught me heaps. I've always been in love with valve radios and now amplifiers have caught my imagination . You have a great sense of humor, love your pets and full of knowledge which you love sharing in great detail and lots of patience. You are simply amazing!. Keep up the noble work you have undertaken.

Fantastic video Doug. In HS I was a wiz at algebra, 50 years later I can't remember a darn thing, use it or lose it. Thanks Doug.

Uncle Doug, thank you for creating and posting this wonderful series on valve amps. I have found it to be a most comprehensive and detailed tutorial on the repair and servicing of valve amps. It is worthy of having a place in the most prestigious educational establishments and should be offered as a stand alone course there. I know it has answered all my questions on servicing this equipment and has allowed me the required skills to safely service and repair my own equipment and for this I would like to thank you.

Excellent lesson! Great videos keep them coming.

Uncle Doug; I can't get enough of your videos! I have been using tube amplifiers for 50 years, and have never found a reliable source of information on their operation until I found you. The internet is chock full of bad information on this subject, so its great to have someone I can trust. Premier Guitar had an article that gave a cursory explanation of the subject, but it lacked your detail and usefulness. Thank you SO much for these enlightening videos.

12:09...we have all been through it!! I think the reason why we "tuned out" when we were in Algebra Class, was because we were thinking at the time: "WHAT IS THIS $#!] GOOD FOR?!!" ...well, now we KNOW "what it's good for"(!)

Thanks for the refresher course on Ohm's law. Its been 40 years since had learned that, when I was in the navy. Since then I had no need to use it and had forgotten it. Now that I'm needing that information it sure is very handy. Thanks again

you where born to be a teacher I bet you could sell these video's thanks again

Your so good!!! being a teacher myself im so impressed by your skills for explaining, so methodical and i love how you use the language then translate it to formulas. I wish i had a math teacher like you when i was i school. Plus really helpful information explained. Thanks UD

Doug. Great old skool reminder of the basics. Always valid. You Rule gov'nor !

Uncle Doug sir,this is the best class I have attended,i can see more clearly now. Thank you very much

once again, even without rusty or jack, you have explained the very basics of electronics. Perfect job! Thanks a million.

you are the best instructor ,teacher, guru etc. I have ever encountered . Thank you so much.

Thanks for helping us mere mortals that have a passion for tube tone understand the circuits in our amps. You are a very good and interesting teacher. I appreciate your efforts. Mike

Thanks. You are doing the web community a great service.

So much informative stuff. Thank you very much :) keep doing it.

Just finished watching your great Capacitor videos, loved them....now I'm going to plow through your resistor videos ....of course I'll be taken notes. Love learning from you....I wish I had teachers like you back in high school....mine were the worst ever!

I think this is one of the best videos I have seen for helping someone understand building an amp. Thanks. I would love to have, had someone of your teaching skills when I was in school. Maybe I would have wanted to learn more. It is not easy to learn when you are my age!!!!! I have to read it or watch it over and over and over.

I'm gonna echo what others have said already: I wish I'd had you as my algebra teacher back in HS. Mine was more interested in winning math team trophies than actually teaching those of us who didn't grasp everything right away.

Your teaching reminds me so much of how my dad taught me. And he was the finest teacher I've ever met.

Your videos are helpful. I'm the proud owner of 4 tube guitar amps, 2 of which are hand wired, 3 with DC Rectifier tubes. I hope to carefully (safely) learn how to bias my own fixed biased amps (2), and perform amp circuit testing, and replace bad caps, etc. Thanks for helping me to move toward that goal.

I confess! Every time I come across the math equations in any of the tube amp journals I have read, my mind blanks them out. I swear my vision blurs at the same time. Thanks again for simple explanations for all things regarding tube amps. I remained awake during the whole video !!!

Glad I found your channel. I have lots of old circuitry to scavenge, and a long winter ahead!

Uncle Doug, I just wanted to say thank you. I just started my journey into the world of tube amps and your videos are a great help here. You explain things in a manner so that everyone can understand it and it makes sense. I have books and materials on the internet but having these videos helps me more than any book ever could. Thank you so much. The world needs more people like you :) Stay healthy and cheers!

First time that I really understand Ohms Law, voltage drops etc. Thanks for a great video! John

This is a fantastic video. Thank you for breaking it down in such a clear way.

Uncle Doug, I have learned so much from you. I have absolutely no training in electronics and thanks to your instruction i am fixing my own amps. Also I might mention that my son has a recording studio (professional) and a degree from Berkley music college in MA, I've built him compressors, pre amps, and I do maintenance for him just to mention a few things. All this has been possible because of what you do. I want to thank you sir, i really appreciate all the instruction and info. Lee

All of these videos explaining different parts of how these tube amps work are very interesting and informative! I am a complete beginner in all of this and it is very understandable. Thank you for well made simply explained lessons.

I can't stop watching your videos man, thanks for the help!

Great video Doug, now I know why I didn't need that variac for the new filters for my amp in the first place. Keep em comin!

I like the simple explanations.You have the gift of make people of different kinds of age, understand everything no matter their scale of knowledge.This is how all teachers have to teach all children or students in high school or univercity.

Hello Doug. . My cat Molly was miffed that you didn't mention Jack the Cat in the first part :) Now to get more serious, I have always had a hard time with math,it was my worse subject in school. The way you explained Ohm's law in the video was the first time I really understood how it worked and how to best use it. Thank You ! I will be looking forward to your next video, It a shame most teachers aren't like you. The ones I had, didn't seem to have time for a poor country boy like me. Much respect Doug. Bobby

When I first started electronics all I could find at first was resistors from a local surplus store. With that pack of resistors, a breadboard, some LEDs and a multimeter, I spent a good 3 months or so learning stuff about them before I moved on to other things. Don't under estimate the complexity of electronics. If you think something's simple, you don't know enough about it.

Excellent explanation ! I think this video works because it mixes theory and a practical example. I'll be directing friends to this video to learn the basics. Thank You. Well done.

Your teaching Excellence once again is so helpful!! Thank You

Great video Uncle Doug! I would recommend that after you showed the example for calculating the resistance value need to obtain the B+ voltage drop you need that you would have actually demonstrated taking the measurements in an amp and using those reading a calculate the voltage drop. As you know from practical experience that readings are rarely exactly 10, 100, 1000 etc. Also how to determine what wattage size resistor you need for your application. I'm eagerly anticipating your next video as I find all you videos enlightening as well as entertaining. Keep up the great work!

That was a very great video, easily explained with the practical examples. Looking fwd to the rest of the series vids now. Cheers!

Han Solo, since haven't activated Google+, your comments came without any Reply capability, so I'll have to answer up here. You're welcome....glad you enjoyed the video. The resistance value is calculated based on the current to which the resistor is exposed. Once the resistor is installed, both the voltage and current are dropped when they exit. In my example, I merely wanted to demonstrate a use of Ohm's Law, but in reality, anything you do to alter the flow of current in a circuit will alter the effect of the other resistors in the line, and may necessitate their recalibration. I ran out of time for power/wattage calculation. In the case of Example 3, you could use the formula: Power in Watts is equal to the Voltage Drop times the Current in Amps. So P = (150V)(.1A) = 15Watts. I will discuss this and respond to some questions (such as yours) in the next video. With respect to Carbon Comp resistors vs Metal Film, I think there is a lot of hype and self-fulfilling subjective "listening" tests being offered as proof of difference, but I tend to agree with your theory.....the inherent imprecision and fluctuating performance of Carbon Comp resistors makes them more random and unstable, providing a "livelier" tone than the much more consistent, almost robotic Metal Film resistors. Going 100 mph in a jalopy always seems a lot faster and exciting than 100 mph in a Cadillac limousine. I personally split the difference and use Carbon Film resistors in most applications, with Metal Film in the power supply.

I’m really enjoying how you explain electronic theory.You make it clear, precise, and easy to understand and learn. I enjoyed algebra in school so everything you’re teaching here is refreshing my memory. Thank you😊

Again, great video Doug, I understood ohms law but could never apply it correctly, but now I can thanks to you. MUCH appreciated.

I'm hooked and am now anticipating each new video! Thanks Again

As always very clear and thorougher the way you explained it, it has removed the mistery from this subject so thank you. Mark Hodges (UK)

I spit up my drink all over when you said beaver shots I haven’t laughed that hard in a long time thank you for making my day I love your videos Doug you are a great teacher and many people agree

This was super helpful! I look forward to more!

Respect! The best explanation I had seen ever. Same as what GK has says, wish I could have some one explain it so clearly.

Fantastic lesson. Looking forward to the others on resistors.

Uncle Doug, you have managed to teach me in 20 minutes what I was supposed to have learned over a whole term in school but failed to grasp. Your explanations are so clear and concise. The electronics Tutors in our school appear to confuse their Students by going off on meaningless tangents. I'm now wondering about their abilities to teach students and questioning their knowledge. In this awsome video you mention ohms, current and volts. The one big question left in my mind is how do I deduce the correct wattage resistor to use in these example circuits; I guess this might be very important if you don't want to let out the magic smoke from the resistor?

Uncle Doug....OMG man, I found your channel about 3 weeks ago, and I cant seem to get enough, Thank You so much for sharing! Want to let you know you have Inspired me to Build a 5E3 Tweed Deluxe Kit which I have Ordered from Trinity Amps, as I am In Canada. Cant wait to get started, Thanks Again, All the best to you and yours!

Hi Uncle Doug, thank you for such an informative video, you make it easy to understand how the circuits work. I now have a better understanding how to calculate the resistive changes I want to make in a circuit, thanks, Bob

Thank you Uncle Doug for this very informative video regarding resistors and various formula/value calculations relating to Ohm's Law. I hope you can do a followup video as well comparing the filtering function of resistor versus a choke and the pros & cons of using either of them as a filtering element. Likewise, how to choose the correct filter choke to use. Thank you!

I knew there was a reason I liked your videos so much. I'm a fellow math teacher. :) Very nice, crystal clear explanations with great analogies. I got my PhD back in 2012 (the focus of my thesis was an area of algebraic geometry called deformation theory). I am just starting to get into servicing/building amps as a hobby myself. I will be starting my first build soon: a build of a tweed Vibrolux 5f11 from a Mojotone kit. Keep up the good work!

Hi Uncle Doug, I continue to watch your videos exactly where I left off around november of 2015. Wow time flies like crazy. But at least I have almost 30 "new" videos to watch :D And as always I'm learning a lot. Keep up the good work :)

Your the best Uncle Doug. Thanks again.

wow! great demo on resistors, never thought of this direct comparison.

You sir are an amazing electronics teacher.. Thank you for these awesome videos

Thank you for a really wonderful and helpful video. I wish I'd had you as a teacher when I was at school all those years ago, I would have had a very different life.

Very well explained basics of resistors. I hope you will do also a series abaut other components like caps and diodes. With such a teacher, i'd surley get it! greetings from Netherlands

Hello Doug, I am French, but I have the chance to understand your language very well. I think you give the best explanations I have heard. Bravo for your precise and meticulous work. Best regards :)

thank you uncle Doug, you are a great teacher.

This just helped me so much!!! Thank you Doug Still working with it! looks like I’ve got some testing to do

Thank you for teaching us this informative information. This video was very informative. Its simple & understandable.

Again, Thanks Uncle Doug!! Very Informative. I took 2 Years Mechanical Drawing in High School, we had an Area Vocational School, as part of the New High School Bectal built for us, for Building Arkansas Nuclear One, on Lake Dardanelle, in Russellville, Arkansas. The 3rd Year, I took a Basic Electronics Class. This is bringing some of that back for me. One Question, " How do you Drain, the Electrolytic Capacitors? I remember taking a test in class, and Forgetting and then Picking up a Capacitor, which Zapped me - DOH!! Haha!!! So, might be good for others to know too. "

Best video's on this topic out there! Thanks Doc

Even If I know something it's always great to hear your approach to the subject! :)

One of my early instructors, many decades ago, laid Ohm's Law out so. You can use either of the two, depending on what you know to be true. E P I R or I E Circle what you want. You want P (power)? What do you have left? I times E (or IE). You want I (current)? Whats left? Either E over R or P over E. You want E (voltage)? Either I times R or P over I. You want R (resistance)? E over I. Easy to remember. And, I never forgot it.