Uncle Doug might be the coolest cat on KZread.....And DEFINITELY one of the best instinctive teachers. Thanks for another informative video, sir.

@UncleDoug

5 жыл бұрын

You're welcome, Eli. Thanks !!!

@damianvila

5 жыл бұрын

He surely is the coolest can in the clowder! And a fine clowder he has there! 😸

@NewYorkSong1

5 жыл бұрын

Man ain't THAT right!

@UncleDoug

5 жыл бұрын

I hope you mean "cat", Damian :)

@denniswalsh8476

5 жыл бұрын

He sure is. My electronics instructor at the voc I went to in late the 60s was pretty good.... but his circuit explainations were lame compared to Uncle Doug.

I learn more from Uncle Doug than any electronics instruction source. His smooth voice, combined with "down to basics" approach are just great. The levity of adding in a current cat status here and there are just great. I could listen to him all day, and have learned so much. He goes into technical aspects effectively, and doesn't insult as he goes way back to basic concepts to ensure he's grabbing all audience members regardless of their own knowledge base. These are just great.

@UncleDoug

5 жыл бұрын

Wow.....thanks so much. I really appreciate the very nice comments.

This is the best hands down the best video explaining impedance ratios, in a way that an idiot (me) can understand it. I can tell you are a teacher in your profession. Thank you!

@UncleDoug

4 жыл бұрын

You're quite welcome, Ik. Thanks for your nice comments.

A very "in depth" look at OP transformers. This is a tried and true method of matching unknown transformer tubes to speakers, but it was not well known, until now! Your presentation was easy to understand, although nothing about impedance matching is easy, you did an excellent job of explaining it all. You truly are a wonderful teacher! Whether your students knew it or not, they were extremely lucky to have had you as their teacher! You did what I would have done with the Rat Rod. Painting the wheels did not take away from the Rat Rod's over all look. The mods you did were spot on! You are almost ready to start racing it. Thanxz

@UncleDoug

5 жыл бұрын

Thanks so much, ATL. This was actually the third version of the video......I discarded the first two, thinking they were too pedantic. Hopefully, it will successfully convey the concept to a broad audience.

@GuteisFinger

5 жыл бұрын

@@UncleDoug "Pedantic"?!!! I resemble that remark.

@UncleDoug

5 жыл бұрын

It's my "big" word for the day, Carl :)

@audiotechlabs4650

5 жыл бұрын

pedantic......never used that word before, but I'm a sucker for unused words and phases. Uncle Doug you are no pedant. A wonderfully explained way to further one's knowledge, in a precise, logical manner, is not pedantic! It's just the Uncle Doug way! Thanxz

@GuteisFinger

5 жыл бұрын

@@UncleDoug Allow yourself one for each project and we'll be standing by with out dictionaries and the google. This is random, so please delete if inappropriate, but I found this cool short video comparing LDR vs. bias wiggle trem using two very nice Fender clones and some very tasty licks. Thought you and your viewers might find it of interest. kzread.info/dash/bejne/lI2MltOJocaspps.html

you're awesome Uncle Doug you always seem to put out something that helps me understand a project I am currently dealing with.

"if this sounds interesting...", well, you haven't disappointed yet. Another great and useful video, thanks Uncle Doug!

@UncleDoug

4 ай бұрын

Glad you enjoyed it, Ben.

Bless you Uncle Doug for sharing your wisdom with us!!! I have some organ transformers from a yard sale and did not know where to start. I also have some organ tube chassis with large transformers on them.

@UncleDoug

5 жыл бұрын

Good luck with your measurements, F1. I hope you find some useful OPT's.

This is the tube amp video that I needed......I have seen this referenced many times on forums, and couldnt wrap my head around it.....Thank you

@UncleDoug

5 жыл бұрын

You're welcome, Gary. I hope it's helpful.

...As an old Norwegian saying: Good things cannot be said often enough - you are the best teacher ever.. Thank you :-)

@UncleDoug

5 жыл бұрын

Wow. I really like old Nowegians.......and their sayings, Patrick :) Thanks so much. You're welcome.

Uncle Doug, thanks for the inspiration! I am on my 3 vintage amp build thanks to you. Been a blast learning from you and my clones have received rave reviews. Thanks for providing the knowledge that moves beyond duplication of a circuit and comprehensive understanding of a circuit. You are a good dude!

@UncleDoug

5 жыл бұрын

You're welcome, Paul. Thanks for all the very nice comments.

Fantastic video Uncle Doug! This has been a huge mystery to me for years and you found a way to teach it in less than an hour. My overall understanding of amplifier circuits has just gone up a notch! Thank you sir!

@UncleDoug

5 жыл бұрын

You're welcome, DS :)

This channel really is a WEALTH of information! Really great video!

@UncleDoug

5 жыл бұрын

Thanks, DW :)

Thanks Uncle Doug. My grandfather left me a box of used tubes and output transformers. Now thanks to this video I will be able to properly give life to vintage amplifiers. Thank you very much for sharing your knowledge and your work. It is amazing and impeccable as always

@UncleDoug

5 жыл бұрын

Thanks so much, Demian :)

Once again Uncle Doug, you make it plain as day. A master.

@UncleDoug

5 жыл бұрын

Thanks, Chris.

I don't know how I missed this video. This was genius. Thanks Doug!

@UncleDoug

4 жыл бұрын

You're welcome, J&K :)

So useful, I can't thank you enough for posting this Uncle Doug.

@UncleDoug

5 жыл бұрын

You're welcome, GS.

UD that was a brilliant explanation! Clear concise & easy to understand! Love that exhaust tone can't wait to go on a ride along! Thank you Sir!

@UncleDoug

5 жыл бұрын

You're welcome, James. Thanks !!!

Thanks Uncle Doug! This is a jewel of information. Totally clarifies a lot about both tube and transformer selection. Your videos are just awesome.

@UncleDoug

3 жыл бұрын

You're welcome, PF. That's great to hear :)

Definitely, there should not be many people as calm as Uncle Doug explaining in detail the details of technical areas as specific as is the case with transformers. This is undoubtedly needed by all of us. Thanks for the explanation, Uncle Doug. Stay safe! Macedo Pinto Portugal

@UncleDoug

3 жыл бұрын

Thanks so much, RJ. Although I are always excited to discuss tube amp theory, apparently it is not evident in my voice ;)

UD has Legendary Teaching and communication skills.. THanks for this great video Doug!

@UncleDoug

5 жыл бұрын

You're welcome, CD. Thanks so much :)

As soon as I saw this video title, I thought of how I use a pair of 6V6GT's for my 1484. I pair an 8 ohm 15" speaker with the 4 ohm tap. Interestingly, that means I can push the 6V6's to a good amount of power with less worry that I might damage that little OPT! Thanks for covering an example that is close to my heart!

@UncleDoug

5 жыл бұрын

You're welcome, Britt :)

All that work on the car, I am most impressed with the wheels. Great idea

@UncleDoug

5 жыл бұрын

Thanks, Dirk :)

Every time I have a question that needs answering about tube amps, the first thing I do is search for one of your videos. 9 times out of 10 my question will be answered in a way I can understand. Thank you for sharing your time and knowledge.

@UncleDoug

Жыл бұрын

Glad to hear it, DL. It is our intention to be clear and helpful.

The knowledge you give is priceless. Thanks for sharing!

@UncleDoug

5 жыл бұрын

You're welcome, Vince. Thanks for the acknowledgement.

Excellent Tutorial Uncle Doug! I've always wanted to figure this stuff out ...and your explanation has been the most logical & easiest to understand that I've come across thus far! Keep the videos coming!

@UncleDoug

5 жыл бұрын

Thanks, Daniel. We will :)

There's so much useful info in this video. I tried to like this video so many times, because I thought that it was a totally different video with new info. You're a treasure trove Uncle Doug! Btw I just repaired, retubed and biased my first Marshall amp much thanks to info that you've shared on your channel. Thank you Uncle Doug!

@UncleDoug

2 жыл бұрын

Glad it was helpful, Elmo. Thanks so much :)

Ohhhhh boy! My favorite subject! Thanks Uncle Doug. People NEED to know this stuff for repairs/modifications/scratch builds. Give the kitties some pets and treats for me.

@UncleDoug

5 жыл бұрын

You're welcome, Matt. I will :)

Cool stuff, Uncle Doug!

This blew my mind. I never considered the impedance of the output tubes impacting the impedance of the secondary of the output transformer. Furthermore, I was about to rewatch your transformer videos to see if I could figure the secondary impedances of the mystery output transformer I have for my next build, then I get a notification for this video. Uncanny timing. lol Excellent video my friend. Thank you

@UncleDoug

5 жыл бұрын

You're welcome, Kevin. The output tube impedance divided by the impedance ratio must equal the speaker impedance, so all three factors must be in agreement and each one affects the other two.

@zarchy55

5 жыл бұрын

It’s not the impedance of the secondary that’s in play here. It’s the impedance of the speaker that is reflected through the transformer by the square of the turns ratio. This is the effective load seen by the tubes. This should be matched to the tube output impedance.

Amazing, I was just today researching how to calculate the transformer impedance of two unknown toroids I have - and then this pops up in my playlist! Thank you sir for your, as always, very interesting and educational videos! 🙂

@UncleDoug

5 жыл бұрын

You're welcome, HB. I hope the video is helpful.

As always, thanks for sharing. That will be one more trick up my sleeve. Great information.

@UncleDoug

5 жыл бұрын

You're welcome, Daniel.

Life can be terribly difficult sometimes... and when I need a healthy dose of calm, and a review of some of the principles behind our love of music and old amplifiers... I pull up a chair at Doug's place. That soothing voice... those famous quips... and the patient knowledge... and I'm all better and ready to face another day in our convoluted world. There will never be another Uncle Doug. Thank you sir! You are a saint... and greatly appreciated!

@UncleDoug

3 жыл бұрын

Wow, thanks so much, Mark. We're always here for you in your time of need, and look forward to hearing more from you in the future :)

@jjiacobucci

3 жыл бұрын

I couldn’t say any better. It’s a wonderful day in the neighborhood ! With those gems of dry humor, it’s always an enjoyable visit c Uncle Doug !

@nikoladivic2786

Жыл бұрын

💔💔

Aha! once again you've made it perfectly clear. I'm very appreciative of your knowledge! Thank you!

@UncleDoug

5 жыл бұрын

You're welcome, Greg.

Watching this over Chritmass hols and want to say all the best for the new year from Portugal. Living a shoestring , delux shanti,off grid(ish(got 220 volts pluss donkeys(future transport hopefully) and setting up a small workshop to fix my amps and guitars, used to work on a valve stuff in late 60s in the Navy (FAA uk)Aircraft then had racks with Nav computers (analouge) comms transmitters recievers radar gear.,etc all driven by mini valves. At 71. now its so nice watching your vids and learning and being awakened by you,a truly gifted teacher your kindness comes over, what a softy with the critters❤ as well as your mischievous side (cars😊) thanks and hang on to the kid in you

@UncleDoug

2 ай бұрын

Thanks for the very nice comments, William. Will do ;)

Perfect timing UD! This is very handy. Thanks!

@UncleDoug

5 жыл бұрын

You're welcome, FWR :)

Once again THANKYOU! I have finally bought a 5F1 kit and making the cabinet etc. You have taught me and I think alot of others so much.

@UncleDoug

5 жыл бұрын

You're welcome, Troy.

Very Excellent instructor!... Way better than my old HS Electronics theory AND shop instructors (who were just obsolete GE engineers)! You've opened up and are KEEPING ALIVE... the ART of old school tube design. I've got over 40 yrs in electronic design and now have grand kids interested in the way things used to be done (when they asked about vinyl records, and one building an amp)... so, just so you know... you have some YOUNG new fans too!!! Thanks for helping NEW generations keep the old school arts alive!

@UncleDoug

3 жыл бұрын

Thanks so much for your very kind words, S. This is exactly the news I love to hear. We need "new blood" to keep our hobby alive.

Another great and informative video...thanx!! That Rat Rod looks and sounds awesome!!

@UncleDoug

5 жыл бұрын

Thanks, T2 :)

Great episode UD! thanks for sharing,nice ride!

@UncleDoug

5 жыл бұрын

You're welcome, SG :)

Thanks, Uncle Doug - I learned something from your video, as expected. You made my day!

@UncleDoug

5 жыл бұрын

You're welcome, CM. That's good news.

Brilliant presentation Doug.. Years ago I learnt about TX's whilst doing my Ham Radio exam, but here we are 50 years down the line and I'd forgotten most of it. I'm pleased to say I got your quiz correct which is down to your laid back, detailed & precise teaching,. Nice to see the cats & the Hot Rod as well. If you tried driving that on UK roads you'd be arrested, ha-ha !.

@UncleDoug

5 жыл бұрын

Thanks so much, Pete. The cops can't ticket what they can't catch :)

@pda49184

5 жыл бұрын

@@UncleDoug Ha-ha.. How very true...But our lot are equipped with helicopters & 'stingers' (spikes that are placed on the road to puncture all your tyres (or should I say tires !) when you dive over them) .. They're about to get commercial drones , no doubt equipped with cruse missiles, ha-ha...

Dude you are living the dream! Thanks for the hot rod addendums - definitely adds color. Oh yes, the transformer tutorial was great too!

@UncleDoug

5 жыл бұрын

You're welcome, Curtis. Thanks !!!

Having always wanting to design a guitar amp, the one think I've always known is the closer one matches the OPT to the tubes being used, the better the frequency response. This video is priceless for exactly that reason and so are you Uncle Doug! Thanks for all you share with us 'whippersnappers". I hope to do you proud with my amp design one day. EDIT: That Ford is looking rude! Great work!

@UncleDoug

2 жыл бұрын

Thanks so much, G. I'm glad the video was helpful.

@GORF_EMPIRE

2 жыл бұрын

@@UncleDoug Not at all sir... thank you!

I'm into ham radio and want to learn tubes so I can build my own AM transmitter. I am learning more from Doug about tune technology than I am about any tube radio guy on the internet. Thank you Doug!!!

@UncleDoug

Жыл бұрын

You're welcome, Q. Thanks for the nice comments.

Uncle Doug You gave it away when you had the color order written down. LOL!!!.. Still Your the BEST online Mentor I've ever come across.. Thanks from Austin Tx.

@UncleDoug

4 жыл бұрын

You're welcome, BM. Always good to hear from a fellow Texan.

Thank you for the video, Uncle Doug, very clear and informative.

@UncleDoug

5 жыл бұрын

You're welcome, SE.

Excellent information Doug. Watching your videos takes me back to my VOTEC electronics classes in my high school years. I had some great instructors that really knew how to make the material interesting as well as being able to present it in a way that made learning it easy and made you want to learn more. Thanks for all of the work you put into these videos.

@UncleDoug

5 жыл бұрын

You're welcome, SA. Thanks so much :)

Thanks so much Uncle Doug! Just what I needed to check out some unknown spec OTs I have sitting around! I do love your restauration videos and repairs but I also think these educational theworetical ones are superb and so well explained! Awesome!

@UncleDoug

5 жыл бұрын

Thanks so much, CB. Viewer numbers drop when I post technical videos, but I still do it, because the technically-oriented viewers, like you, really seem to appreciate them.

Thank you - people on forums make this very difficult to understand. Now i’m going to go re-test all of my mystery transformers

@UncleDoug

Жыл бұрын

Good luck, F.

Another awesome and highly enlightening video. Many thanks! And the rat rod is super cool too!!

@UncleDoug

2 жыл бұрын

Thanks so much, SB :)

Fantastic stuff UD! This was a bit of a mystery to me, but I now completely understand it.

@UncleDoug

5 жыл бұрын

That's great news, Rachel :)

Best video I've seen in a while, thank you very much for your work. Wonderful car too!

@UncleDoug

5 жыл бұрын

Thanks twice, Amity.

Thank you so much for this uncle Doug, I’ve been waiting to see a video with this kind of info

@UncleDoug

5 жыл бұрын

You're welcome, Tim. That's good to hear.

This is exactly what I needed, thanks Uncle Doug!

@UncleDoug

5 жыл бұрын

That's good to hear, Tommy. You're welcome :)

This was just great uncle doug. The explanation was very clear. Another great video.

@UncleDoug

5 жыл бұрын

Thanks, Rohan :)

@rohankhemraj

3 жыл бұрын

@@UncleDoug I recently completed a 100-watt plexi kit amp and had some trouble with it. In the end, the problem was a mislabeled output transformer. By modifying the procedures you presented in this video, I systematically tested the transformer to determine the common, 4, 8 and 16 ohm wires. Now I know the common was yellow, not white. To be safe I compared calculated the effective load resistances with a similar Hammond unit. Thanks for the video.

Uncle Doug, This was a great and easily understandable video. I hope that you do more for us tube amp newbies, before we ruin an old amp. And please keep us up to date on the ratrod too!

@UncleDoug

5 жыл бұрын

Thanks. We will, Bob, in both regards :)

I'm so Happy! I WATCHED THIS, followed along, with my trusty calculator & actually understood this ~ I feel like I regained the knowledge I missed by not paying attention, when my father tried to instill this info in me when I was 12 years old. Thank you, Uncle Doug! Much appreciated!

@UncleDoug

4 жыл бұрын

Our pleasure, Ace......glad it was helpful.

@acesteele8559

4 жыл бұрын

@@UncleDoug It certainly WAS! I am most greatful!

*As usual - a pleasure to watch.* I love the perfect balance between serious information an subtle sardonic humour. Keep it up sir ;-) .

@UncleDoug

5 жыл бұрын

Thanks, DQ. We will :)

Uncle Doug your a great teacher, that is a rare gift these days. You really have a way about you that makes leaning fun.

@UncleDoug

5 жыл бұрын

That's great to hear, Jeff. Thanks !!

UD, great looking Rat Rod, I like it a bunch.

@UncleDoug

5 жыл бұрын

Thanks, Gary :)

This was long but worth every minute - its obvious you where a teacher, nice slow, even tempered pace which is easy to follow but goes in. I have a mountain of output transformers that this will be essential for - bless you sir! :D

@UncleDoug

5 жыл бұрын

Thanks, Prince. I always feel obligated to explain every detail and then reiterate key points, which takes some time, but generally works well with beginning and intermediate students. I'm glad you found the information helpful.

@PrinceWesterburg

5 жыл бұрын

@@UncleDoug - Would you believe I've built valve circuits for decades and only late last year learnt Ohm's Law. Everyone says its so tough but, errr, nope! Once again thanks for blowing my mind - I really had not the first clue that the secondary impedence was in any way linked to primary coil voltage or valve resistance, these are transformers after all! LOL :o)

You made that very understandable that was the first time I could comprehend how to come up with the impedance and our relates to the use of vacuum tube and speakers by varying voltage

@UncleDoug

5 жыл бұрын

I'm glad to hear that, TL. Thanks.

Well presented Doug - great informative video.

@UncleDoug

5 жыл бұрын

Thanks, AG.

Thanks Uncle Doug, a very good tutorial on measuring transformer characteristics through its impedance reflection (conservation of power). This can be a real head scratcher to newcomers and this video clearly shows the process of working it out. Very nice. Cheers, - Eddy

@UncleDoug

5 жыл бұрын

You're welcome, Eddy.

Great video uncle Doug! Love the pop quiz and the rat rod looks awesome! Than You

@UncleDoug

5 жыл бұрын

You're welcome, Prof. Thanks !!!

Thank you! You are a very good teacher! And you are so kind to share your experience and wisdom to explain these things in such a simple way! 👍🤗

@UncleDoug

Жыл бұрын

You're welcome, Lee. Glad you enjoyed it :)

Merci beaucoup M. Doug !!! Great video.

@UncleDoug

5 жыл бұрын

You're welcome, Mathieu :) Thanks !!!

What a wonderful Video !! Many thanks !!

@UncleDoug

2 жыл бұрын

Thanks so much, V.

Thank you so much for this video Doug. It helped me reverse-engineer an amplifier I have. And I finally have a clear understanding of output transformers!

@UncleDoug

3 жыл бұрын

That's great to hear, Carl. Thanks for making our day :)

Amazing, I love your explanation. Great teacher.

@UncleDoug

5 жыл бұрын

Thanks, Michael.

I love your restos and rebuilds, but this is the stuff that initially drew me in to your channel. As a novice amp builder/modder myself, this information as extremely valuable. Thanks for doing it. If I may make a suggestion...do something similar with a power transformer when you can. I'm still in the dark about deciphering and adding up amp-draw requirements and stuff like that.

@UncleDoug

5 жыл бұрын

Thanks so much, GL. I have already covered power transformer specifications and selection in previous videos. See the Supro TremoVerb series.

No single thumbs-up button is enough for the gratitude I'd like to express for a clear, concise, BS-free explanation. Thank you, Uncle Doug. Subbing immediately!

@UncleDoug

3 жыл бұрын

Wow, thanks so much, Ana. Welcome aboard :)

@anavictorialadulce

3 жыл бұрын

@@UncleDoug Seriously, though. Here I was thinking maybe I wasn't smart enough after seeing so many arcane, byzantine and even cryptic explanations and you made it all click. That's another wonderful talent of yours. Can't get enough of this channel, so please do keep them coming! Sincere thanks and congrats!

Love that 34. And your. Tutorial on impedance ratio was 😃 great thank you

@UncleDoug

Жыл бұрын

Thanks twice, William :)

Great video always learn something from them & you have some cute cats

Hello Doug, I just wanted to say Thank You for this video, I learned so much! I followed your set up and it worked great. I have been watching all of your videos and taking notes along the way. I watch a lot of other electronic channels and I have to say that your style of presenting (teaching) is unparalleled. Say hello to the kitties for me. Bart

@UncleDoug

Жыл бұрын

Thanks so much for your very nice comments, Bart. We're glad the videos are helpful.

This really explains it well. Thank you for this video.

@UncleDoug

3 жыл бұрын

You're welcome, M01 :)

Man, thank you so much!!! This is basically pure gold, thanks for sharing ❤

@UncleDoug

6 ай бұрын

You're welcome, Federico.

Great explanation. Finally i know how i can use a transformer that have been lying in a drawer for many years. TIPS. I used a 240 - 12 Volt AC-AC adapter made for AC guitar pedals.

@UncleDoug

Жыл бұрын

We're glad the videos are helpful, Arn.

Outstanding teacher!

@UncleDoug

5 жыл бұрын

Thanks, Justin :)

Sensational! Super useful!

@UncleDoug

3 жыл бұрын

Glad it was helpful, Fernando :)

Glad i Just became part of the Family Uncle Doug. You are a Life Saver.....

@UncleDoug

2 жыл бұрын

So are we, Stuart. Welcome aboard :)

@stuartewoldt1513

2 жыл бұрын

@@UncleDoug I do try to work on amps. Found a 1978 WEBB 6-14 E in the trash. Inside the back of the amp was a old Peavy 705-18771 transformer. Surprised the old Peavy sticker was still intact. Its in a complete metal casing 4" tall 6" across. I'm gonna dig into this amp but apparently there somewhat rare. I can't believe someone threw it in the trash, could've at least parted it out. Thank you for sharing your knowledge, think I got 1 extra IQ point👍

@UncleDoug

2 жыл бұрын

@@stuartewoldt1513 You're welcome, Stuart. Best of luck with your project.

That was awesome!

@UncleDoug

4 жыл бұрын

Glad you liked it!

This video is extremely useful, I used this technique on a project I am working on and characterized the O.T.. Then in researching the tube characteristics found that the bias used, FIXED or CATHODE also changes the plate to plate output impedance.

@UncleDoug

5 жыл бұрын

Yes, it does, Scott. You have to factor in all the variables when determining the plate impedance.

This is great. Thanks for doing this! I learned something (actually a lot of somethings) today!

@UncleDoug

5 жыл бұрын

You're welcome, Sean. That's good !!

This is fascinating stuff!

@UncleDoug

5 жыл бұрын

Thanks, Sting :)

Great video again! Love your car, well done.

@UncleDoug

5 жыл бұрын

Thanks so much :)

Thank you so much for this excellent information. I have a few transformers that are not marked. This video is going to be saved in my files! Love the rat rod and thanks for sound check! Music to my ears! Great work on the rod, she is a beautiful car Thanks again!

@UncleDoug

5 жыл бұрын

You're quite welcome, Merc. I hope the video is helpful.

Thank you very much on clearing up the speaker impedance schooling us on the formulations on the making us look smart to our ladies ! Super neat "rat rod" and the innovations you did on the sweet ride showing all ideas to soup our own rides and Fender amps ! Chico-Detroit

@UncleDoug

5 жыл бұрын

You're welcome, Chico.

Thank you for creating this. You are amazing!

@UncleDoug

Жыл бұрын

Thanks so much, AP.

Hi Uncle Doug, fist i apologize for the long story..... second i'm a long time subscriber, have commented on numerous videos which most always got replied to in a friendly manner and i just wanted to let you know how grateful i am to one such as yourself in helping us understand valve tech a lot better. Also you inspired me to start my own video series of a cool tube project soon, will be uploading a video of it later today or maybe tomorrow but i think you will really like it. It's a 1950's Hohner Electronium amplifier originally intended for Accordeon that's going to be a guitar amp but the catch is the tube pre-amp is in the accordeon in the original combo design and i don't have that so all i have now is a 2xel84 power amp. It works fine with a pre amp pedal that boosts about 6-10db and a speaker so i won't be changing anything on the original amp but i will need to build a pre amp with parts i intend to scour from other stuff as much as possible, in the original design the pre amp tubes are fed off a cable running from the amp (yeah b+ from amp to something you hold in your hands...) and the socket is still there on the chassis so i hope to find a plug and build a Fender Exelsior type separate pre amp. Sadly i don't have the original cabinet but what i do have is easily just as or maybe even cooler, an old RCA400 Deluxe suitcase speaker cab covered in dark green/brown Croc skin tolex with a metal grill screen. I intended to just gut the amp for parts because i wanted to build a Marshall style head and cab instead of a combo but when i went to pick it up the guy also had this cabinet laying around and i decided to buy that too and build this combo. Anyway .... long story short I hope you'll take a gander when i put the fist video up and again thank you very much for teaching and inspiring. Best wishes, Frans

@UncleDoug

5 жыл бұрын

I would be honored to view your first homebuilt amp project, Frans. Just provide a link and we'll be there for the premier.

@FraJa1980

5 жыл бұрын

@@UncleDoug Thank you! had some technical problems yesterday when i wanted to put part 1 up so we'll try again later this evening and if it works this time i'll drop the link!

@FraJa1980

5 жыл бұрын

@@UncleDoug Hi Uncle Doug, i finally got the first video of my project up, this narating videos is much harder than people think so it took me a while to do the best i can but i think you'll like it very much, or at least i hope so. kzread.info/dash/bejne/h4OJrteCfNibYKw.html That's the link, i gave you a little shoutout at the end, hope that's ok. Enjoy and if you have any tips or advice on the project that would be greatly appreciated. Best regards, Frans

That was nerdelicious. Thank you, Doug.

@UncleDoug

5 жыл бұрын

I am flattered. Thanks, Mod.

Great Video. You are a great teacher.

@UncleDoug

5 жыл бұрын

Thanks, Mark.

Hello Uncle Doug, I happened to stumble upon your channel I have absolutely no interest in electronics repair however I couldn't stop watching your videos I was very impressed with your knowledge. Anyway, the reason I'm writing is I have a Marshall Class 5 tube amp that I bought used without a power cord so I couldn't test it first. After buying a power cord (plug-in type) I plugged the amp in to test it and nothing happened. Upon closer inspection where the plug plugs in I noticed it said "Mains Input 230V" So apparently this amp was made to be sold in the UK not here in America. I spoke to Marshall via email explaining the problem they said I need a new Mains input for 110V. After making numerous phone calls I can't find anybody in my area who fixes amps without charging $200 just to look at it. I could probably do it myself but I've heard it could be dangerous if you touch the wrong capacitor so I don't want to do it. Do you repair amps or just restore old amps for yourself? If I mailed you my amp could you repair it for me at a reasonable cost?

@UncleDoug

5 жыл бұрын

It depends on what you consider to be "reasonable", Kenneth. I can tell you that shipping it both ways, combined with parts and labor will cost more than double your local price......so you might be better off seeking local help. One final suggestion: Most European amps made for 230VAC also have primary winding leads for 115VAC. Before you spend a fortune, check the power transformer to see if there are one or two extra (generally black) wires not connected. You might still need some help, but at least you won't have to buy a $150 power transformer.

Uncle Doug, Just bought an old tube amp made by Alamo, the Texas company you mention in your videos. The model is an Embassy and it's been serviced by one of those Mickey Mouse guys you warn about. It works and the sound is okay. Got it cheap from a guy for twenty five bucks. He said the tubes were worth more than that. You should see the "modern art" paint job on the thing! You talk about little white paint drips? This thing looks like it was attacked by the Dutch Boy Paints kid! Can't wait to play it with some volume when I jam with the guys, I live in an apartment and don't want to piss off the neighbors. Thanks for the videos, Uncle Doug, I've learned a lot.

@UncleDoug

5 жыл бұрын

You're welcome, Buzz. I hope it sounds great !!

Thanks for this. I got one of the questions wrong but quickly figured out my mistake. I was looking at the wrong column in the tube manual (AB2 instead of AB1)!!! All good now. Learned a lot

@UncleDoug

Жыл бұрын

That's great to hear, Sean. Keep up the good work.

Great info for peeps like me with numerous unknown vintage output xfmrs laying around.

@UncleDoug

5 жыл бұрын

That's good to hear, Dave.

Great video, thank you for your time!

@UncleDoug

3 жыл бұрын

You're welcome, 59 (great truck, by the way) ;)

Uncle Doug once again imparts the benefits of his years of experience (not to mention wisdom) to us lowly mortals...and we are humbly grateful indeed... When are Jack and Ollie going to release their Josie and the Pussycats tribute album? The world is waiting...

@UncleDoug

5 жыл бұрын

Thanks, C7. They're in negotiations with MGM for an album/movie deal.

I just love it when you teach, if I would have had you as a math teacher in school maybe I would be better at math. Thank goodness there are a ton of electronics calculators online or I would be sunk. I did come up with a speaker combination resembling something that you recently worked on, not exactly but close, that would work for the 6L6GC at 450 VDC Plate voltage and that transformer. Six 4 ohm speakers in series-parallel (2 parallel sets of 3 speakers, 4 ohms each in series) would give you 12 ohms impedance. But other than Silvertone you don't see a lot of 6 speaker cabinets. Probably be cheaper to buy a different transformer rather than six 4 ohm speakers unless you just happened to have some laying around. Just had to give you a little grief, I was the kid in the back row saying ”but teacher what if you did this or that”. Another great video, I really like the rake that you added to the Rat Rod, very classic stance now. I would have probably put N50/15’s on the back. But I am a 70’s wide back tire kinda car guy. I do usually prefer to see some side wall though. Not a fan of the 20’s and 22’s that look like a super heavy duty caster wheel, or a 1920’s solid rubber Truck tire, all wheel with about an inch of sidewall showing. Oh and the header baffles sound great, sounds a bit like a 3/4 cam in that engine, a little lope at idea then smooths right out with a few RPMs. Very good and informative video.

@UncleDoug

5 жыл бұрын

Thanks, so much, Mark. Yes, with different speaker combinations, you can achieve all sorts of odd secondary impedance values.......but I didn't want to complicate matters by delving into a separate subject. Most viewers probably use a single speaker and would be best served by learning how to match it to their output tubes. I too like fat back tires and have a nice pair of 12" x 10.5" Ansen "gasser" wheels that will bolt right up to the rear end and make it look like a steamroller......but for now, I'm going with the 17" red wheels and brand new Coker Excelsiors (not cheap) :) Maybe when these tires get some wear.

Thank you for your fantastic great tutorials on all things tube amp, Uncle Doug. Not many have that smooth ability to teach in a thorough and concise, yet very pleasant and clear and enjoyable manner as you. That '34 hot rod Ford and your vintage tube amps make it worth for Jeff Beck to pay you a visit :-))

@UncleDoug

5 жыл бұрын

You're welcome, Jay. Thanks so much. Jeff is welcome anytime......Jack and Ollie are big fans :)