Video

Congratulations Uncle Doug! I learned a lot in this video. Thanks!

This speaker is older than me, looks better than me and sounds better than me...Great!

This amp + rev + guitar + paws is killer🤟

By Jove, you've done it again, Poirot!

Ah…breakfast and Unca Doug…could life be better? The answer is none…none more better! Another magnificent chapter. Thanks again!

I've been dreaming of building my own tube amp. But because tube amps means high voltages, connecting to house AC, screams and flames, I decided to build small battery operated op-amp for computer speakers instead. Maybe if I some day build house from concrete I'll try tube amp.

I was wondering about the 6AN8 tube, as that was used in television receivers. I've seen more often the 6GH8 suggested as a replacement for the 7199. The 6GH8 was used in Hi-Fi applications, and so might be a better fit in a guitar amp.

The Fender sounds so nice. The tiny white Guy sounds creepe like every other cheep Amp. Nothing special und Not gut😅

10:45 thats a major 6th

Its awesome what you do for the animals. KC sure did fill out well.

Thats such clever use of the photo resistors as volume control with the pedal and light. I have a 1966 Fender Echo-Reverb I oil can that I am in the process of restoring. I added a 3 prong cord, however with some amps, not all, but with some amps it adds some ground loop noise. So I lifted that ground wire and taped it off and the loop is now gone. The 3 prong cord did eliminate the shock that the original 2 prong cord gave, when you touched the unit and a guitar at the same time. So thats good. Im now in the process of figuring out what capacitors its going to need as there is no schematic for the version 1 of that unit available. The unit sounds great and sounds better the longer I play it. Its like an old car that needs to be driven to run well.

Excellent, thank you!

Gibson used 6EU7 tubes in preamp and reverb sections of their GA-77RV (tweed) amp with great success (tone and volume). Would that not have worked instead of a 12AX7 sub?

Howdy. I watched a nice clip from Skunkie Designs about setting up a Limited Liability Company (LLC). The idea being not to get sued for all one has, though end user gear mismanagement. Since You do repair and modification work on people's gear I would think this may be worth considering. High Regards.

Call Bob explaining how that works!

Your channel is the "Watch Mr. Wizard" for us aging children. So much education "disguised" as entertainment...or is it the other way around? I wish my electronic technology classes had been this engaging. Again, THANKS! 😊

With your tremolo mod being what would seem to be the gold standard...it just sounds "better" or "normal", one has to wonder if anyone actually listened to the original tremolo before wiring and selling thousands of these amps. Can you imagine the opening guitar lick of "Born on the Bayou" with the tremolo speed on 8 or higher on the original tremolo circuit design? Jus' sayin' 'z'all...wish I was back on the Bayou, rollin'...you know...

Mr. Douglas...your dry sense of humor is cracking me up...much better than most standup comedians these days...and then I stay for the electronic education...what could be better?!?!?! :-). (Gotta build me one of those speaker-wire handles! Sweeeeeeet!)

Very well done!

Hey Unca Doug...I don't know if you get a chance to read these comments for older videos...can you do a short video on how you got started in electronics, course(s) of study, (text) books...any recommendations to flesh out the (magnificent) videos that you have provided? Thanks!!! (Or have you already done this and I haven't found it yet?) Hmmmmm....

I know this is a little late, but I have a question about the filter capacitor board. How is the underboard of the cap board wired? I have checked the schematic, but I am having trouble figuring out how to connect each cap's + end and the - ends. Any help appreciated.

In southwest Asia, do you suppose they call it "CZcamsStan" instead of "CZcams Land"? These things perplex me...

Yes ! Much better tone 👍

Thanks for you excellent series of videos. But, I read recently that a vertical mounted reverb tank is the better option. I will be trying that in my amp builds. Would be interested in your views on that idea. Thank you.

Another great video. But, don't single ended 6v6 amps want close to 100% max plate dissipation? (70% max plate dissipation is for push pull amps.) 6V6gt is rated max 14w. So maybe Leo had chosen the right resistors?

Watching your vidoes for a little now. Love the way you teach. I'm an auto tech at a dealer and I can appreciate the quality and attention you give. Thank you very much for the knowledge. I've already fixed a couple problems with my dsl40c with that knowledge you passed on.

Jack's a beast!😂😂

Head room is peculiar concept. One might think more headroom is better since there is more dynamic range to use. But what if your amplifier cannot push the signal any near the distortion point, what do you do with that headroom 🤔It's like modern rooms are 270 cm tall but I'm only 190 cm. What do I do with all that volume. Well, heat it using convection heater and very expensive electricity.

Nice gadget !!! I only want to point out that on AC current,, there is no polarity. You can stick the bulb in between either line, the black or the white. Brown or black in EU and blue for the US white. A 100w lamp will do for the EU as the voltage is 230

I asked myself where those cats went to music school. Berklee maybe

Can’t wait till Thanksgiving for all the quivering. It’s gonna be real!

Looking at the o-scope…”we control the vertical…we control the horizontal”…Unca Doug…exactly what planet are you from? :-)

Mesmerized by every minute. The Amp build is magnificent and your manner makes me miss my father (and I am 59). My only criticism; I think you should have left the bullet holes in the Truck.

Love your videos. Was wondering if you would be able to answer an unrelated question regarding ground safety. I just finished wiring a 5e3 kit. The instructions had me solder the power cord ground wire to a tab secured to the chassis on one of the power transformer mounting studs. Can't this nut loosen over time? Do you have any recommendations for beefing up the ground connection?

You’re a very cool man 🫡

At 53:59 your aha! moment shown a light. I have a customer's amp on the bench and earlier today the new TAD 6v6 matched pair arrived. One of the tubes that came with the amp failed in a spectacular way in my tube tester, possibly an omen of the pending nova hovering in the current night sky. With the new tubes in they both had 36mA with -27v bias voltage. Nice match, though. Taking a break I stumbled onto this thread over a sandwich and at 53:62 I went back to the shop and saw a 100k resistor in that very spot. I quickly removed it and saw a perfect 22mA on both tubes. It must have been a common mod in the day as I don't believe much in coincidences. And that is probably why the original tubes were in such bad shape. Thanks for the lead on that!

Looks great and sounds very good, however the tremolo is desperately in need for some intensity regulating, too agressive for my taste.

Very clever trick to aline the cloth. Thanks again

Learned a ton. How you describe the way tubes function makes it very easy to understand. And now I know why vacuum tubes are also referred to as "valves!" Thanks.

For a long time, I have been getting all my tubes just from one local dealer. They have a person that lives tubes. They match them perfectly and do selections for V1 tubes and matched triodes when you need those. I have had great results with current TungSol tubes, and those are in most of the amplifiers I have designed. I also love current Genalex tubes. Those are even more refined. That is good for some schematics despite the fact that a lot of guitar amplifiers do not require nor benefit from HighEnd HiFi tubes. You can easily go with 300 to 500 hundred bucks pair of HiFi tubes and those will not guarantee better sound in the guitar amplifier. At yhe same time you will notice that extra quality in the home HiFi amplifiers. TungSol tubes are more suited for rock but still retain nice level of details. I have started my love relationship with the Hammond iron with small single ended amplifiers. I used them there first as output transformers and chokes. Nowadays almost all chokes I use are made by Hammond. Their iron is just better than expected for the price. Though they have started making some of their stuff in China. To be honest I haven't notice issues with those nut still when I can, I get Canadian products. Sadly some models are made in China only. In a world of boutique stuff made in China label is almost not acceptable disregarding how good part might be. People relate to it like it will be bad quality. TungSol availability is back to normal luckily. Few years ago, in time of this video, availability here was extremely bad. For one of my amplifiers, I have chosen a specific tube from TungSol, and I didn't want anything else. It was impossible to get them. I was talking to my tube guy, and he plainly said it was politics. They couldn't import stuff from that country. I'm glad that at least that part of the nonsense is over.

Another fantastic video. Legend.

I have actually discussed the difference between the Brown-face and Black-face amps with my dog, Josh, and his tail never stops wagging! Thanks for that tip!

Rusty lives on forever

Any comment I could add would be inadequate to show my appreciation for these videos! Thank you so much!

What an excellent amp. Mitzy really stepped up too.

Is neutral (Ground in US) always connected to Earth in the amp? Is the neutral tag strip connected to earth?

Fab series Doug....Great amp and sounds..Love it..More learned..Ed..uk..😄

Just out of curiosity, what percentage of plate dissipation are you running the output tube at?

Thanks for that, my dad taught me this as a teenager along with build radio receivers, then when I was 16 I lost interest and became a motor engineer, I could remember most of it in my head but unsure of some of the facts, this was a brilliant video and reminded me of how my dad taught me ( sorry dad for forgetting some of it RIP) so thankyou again for the refresh as I thing I’m going to build myself a amp for my harmonica, PS that’s some clever dog 🐶 😂😂😂 thanks again x

Hi Uncle Doug, Great videos. Can you please show the title of the tube manual that you used for reference or recommend one? Also, I just completed a Mojotone 5e3 amp kit build with the same tweed cabinet. Yours is not a fluke, mine was perfect too. Really like the amp. Though it has some hissing that Im hoping to solve soon. Wondering about the dijon caps or maybe a tube set. Anyway, thanks for all you do on this channel. Great stuff.