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KT88/EL34... Single Ended Tube Amplifier Build
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- เผยแพร่เมื่อ 12 พ.ย. 2018
- At the beginning of the year, I found this interesting scheme of tube amplifiers on a forum and decided to make it.
After design of layout I ordered the necessary parts.
In the meanwhile, looking for other experiences I found this great TH-cam channel Blueglow Electronics:
/ @blueglow
The amplifier sounds great compared to the complexity and I recommend it for beginners just like myself.
Scheme and photos:
drive.google.c...
Fantastic! It’s absolutely an art piece with workmanship and compact streamlined. You are a genius. 👍👍👍
Love your standards of finish and presentation. Very commendable.
Not too many builders care to arrange the transformers to minimize interference, as you did. A neat way to implement the delay is to use two SCRs in the rectifier bridge. This way, you not only can switch them on and off, but you could also control how fast the filter capacitors charge, in fact controlling how fast the +B voltage rises.
That woodwork tells of true craftsman skills.
That’s the easy part
Well planned , beautifully executed .
Well done sir !
Outstanding. Built the Blueglow version.
Now I'm jealous.
Excellent craftsmanship.
Beautiful. A boatload of information, efficiently laid out, with excellent photos. Bravo!
Absolutely gorgeous and inspiring. Highly aesthetic!
Science meets Art! Very nice! Tastefully executed!
We did that in 1965, part are easy to get, all tubes, transformers pots, caps, etc. We build Preamps, equalizers etc.
Beautiful. I was going to say it reminded me very much of the amp built on Blueglow's channel. And I see you saw that as well. Thanks for sharing the data on the google drive as well.
Ovo je nevjerojatno! Baš rek'o da pogledam video kako je čovjek složio lampaša, kad ono iza piše: napravio Robert Zovko. Ja sam isto Robert Zovko. Baš mi je drago da ima još jedan RZ koji nije debil, nego fino koristi slobodno vrijeme za svoj gušt. Svaka čast Roberte Zovko i veliki pozdrav!
Nice job. Very nice job. I'll copy your wooden sleeve and top & Bottom plates idea. I have some nice mahogany planks and a piece of Indian Rosewood that would make a nice fascia. A polished brass top plate would be nice but maybe quite expensive. I'm liking your amp a lot, especially the recessed valve holder surrounds.
Work of Art !
Bello, realizzato con cura e tanta passione veramente una accurata realizzazione artigianale.
Complimenti
Beautiful job Robert!
Beautyful wiring & sound !
Really really nice enclosure.. Very nice job.
just imagine that in the listening room a bottle of good Brandy on a rainy day looking at the window wow!
Very nice and elegant looking. You did a great job. Thanks for sharing.
Thank You , great music for a great amp
Beautiful Amp. Thank you for sharing this.
Beautiful Amp. Thank you for sharing !! God bless you ::
You're just very detail-oriented! Perfect!
Good Evening Robert, I am very inpressed by the sound quality and craftsmanship. You did an awesome job in building the amplifier. I have only built a Dynaco VTA ST-120 kit. I would love to beable to build the KT88/EL34... Single Ended Tube Amplifier that you have done a excellent job building. If you don't mind would you happen to have a parts list that I could get from you? I would love to try and build the same amplifier as the one you have it's fantastic sounding. Thanks for the time and help.
A beautiful piece of work. A parts list would be fantastic for a noob like myself! I 2nd this request! Lol
Beautiful. Very impressive work - thanks!
Looks absolutely perfect. Greetings from sunny Jamaica.
That is amazing. Thank for sharing, that is inspiring.
Very nice work. I learnt a few things too!
I am jealous. I want one. Well done! Congrats!
Wow. totally beautiful!!!
beautiful tube amp
well done
I have been looking for a KT88/EL34 single ended amp .
Any advice on pre assembled amps that I can investigate.
Everybody's heard of Decware but I've not been able to find out if you can run KT88 and EL34's in any of their single ended models.
If I could find one as nice as yours that'd be ideal but all I really want is a partner to my Prima Luna balanced amp so I can try 'Tube Rolfing' comparisons' between them.
🤤 "Cool Amp Dood"
how much did it cost to build the amp completely sir?
i'm amazed by how well you built it, such fine craftsmanship you showcased for us :)
Bravo, Roberte, svaka cast.
Thats a sweet lil amp !
I saw you added a ferrite core at the power inlet, were you experiencing any hum or noise? Very nice looking work!
The ferrite core not only serves to reduce incoming noise or hum but also outgoing.
Luckily I didn't notice.
This is what I'm looking for, thanks a lot for sharing this with other people. You are the man!
Just awesome!
Beautiful !!!
Prekrasna samogradnja. I ja imam KT88 / EL34 lampasa 😀
Very good nice thank you for sharing
Beautiful
Thanks for your good video and I fount an adapter (SAT UB-1) that can connect headphones by connecting to the amplifier speaker terminal on etsy. .
Very pretty but with all that effort a shielded chassis would be appropriate
Thanks for the comment, I haven't noticed any problems so far, and if necessary, the shield can be done with aluminum or copper adhesive tape.?
@@RobertZovko yes that’s gray but will change as you move to a more now dry rf environment
its not really needed. this is not a phono stage.
Super projekat. Inspirira me da i ja to isto napravim. Da se malo odmorim od digitalnih signala :D
FANTAZIJA-HVALA!
Simple,Great and Elegant !
Perhaps your spirit is the same!
Nicely done! Congratulations!
Beatifull build bet it sounds great.
I'm a tube amp builder myself on 6550we pp ul
это класика от этого не уйти всегда останется актуально
Good job!
Very nice!
Wonder if that 1M on the input makes sense, the input pot allready sets the input impedance, and the pot will be unlinearized with the added resistor.
Maybe unless the pot is a linear one that is.
I agree, it can do without a resistor.
But in a few years the slider can be dirty and in turning the grid remains without grid leak resistor.
Зашибись , Браво!!!
I too enjoy building amplifiers and think your work is very good, looks better than most beginner amps. Glad you're part of the forum too. I'm hoping to get a laser engraver soon to step up my projects, would you recommend yours?
First I tried with this:
EleksMaker® EleksLaser-A3 Pro 2500mW Laser Engraving Machine, but it's too weak, leaves only black print but does not grab the material. So I went to the professional and with a bit of adjustments we set it up for the engraving to be about half a millimeter deep. I do not know which machine I just know it is powerful and at minimal power. So the desired engraving is achieved with the length of laser work.
As far as sound amplifiers are concerned, every honor Kegger ...
Well it looks like it does a great job, I've built one of Keggers designs before and enjoyed. I've been also watching blueglows series on his slightly modified version, most of my builds are 5 watt single ended so been meaning to build something with more power like this.
WOW... That's a really nice build.... 11/10 :-)
Que bella construcción de aparato de sonido
Alguien tiene el circuito de este amp. Y lo puede pasar0
Awesome! what a great build it is
KT-88 is an elegant sound
Представляю сколько времени ушло сделать всю эту красоту! У меня сделан однотактник, я знаю.
Ok felicitari
KT88/EL34... Single Ended Tube Amplifier Build I am interested in buying this product how do I do it?
Beautiful work
This thing must be a commercial kit ... the parts are way to exotic to be available to the public ... how many watts does it give in triode mode and U/L mode ? And at what percentage turns on the output transformer primary is the U/L tapping made ?
Thanks for the comment, this is not a kit but my diy and all the parts are easily accessible.
I tried to make it as simple as possible for someone who is not a professional in electronics and wants to have an amplifier like this.
The power of the amplifier is:
P (triode) = 7.6W
P (ul) = 9.8W
Screen / Grid Tap: 40%
@@RobertZovko thanks for the info ... so it's tapped at 40% ... that's optimum for low distortion and output power .. some p-p output transformers used 20% which gave more power but more distortion as you'd expect . In your opinion which tue actually sounded better ?
Amplificadores valvulados tem o som melhor que os transistorizados. Abraço
Great build, nice job!
That would be awesome buying as a kit and building it, shame I don’t own a CNC tho cos I would give it a try
👏👏👏👏👏👏👏
Great job ! I wish I can do this too
Odličan 5
Sidi 5
Nice work!
Supers sweet 😱
Art
Great! Thanks for sharing
Any advantage using C core transformer as opposed to EI? Or is it snake oil. I know you believe in Toroids. Thanks!
Congratulations.
Excelente!!!
Beautiful Work !
Man there for a second i thought it was going through the pictures to fast... but then i realized it was just going way to fast
Hello, could you share where did you get those antishock plates for tubes? Can't seem to find them anywhere. Thank you
Just found this amazing item on AliExpress. Check it out!
HRK19.74 | Vacuum Tube Shock Proof Iron Plate Tube Socket Mounting Plate For 2A3 300B KT88 EL34 6V6 KT66 12AX7 ECC82 EL84 Hifi Audio DIY
a.aliexpress.com/_EHryBe5
디자인스마트 깔끔한배선 갖고싶은 이쁜자태 좋읍니다
Good 😎
Perfect ! Just an artistic thing! Even if Japanese engineer can't make politely. I think so.
By the way, how the sounds of it is ? Please post using movie, as you would like.
The amplifier sounded great: detailed, with plenty of bass, holographically pronounced ...
Good job
Very Nice ❗👍
Good job.
Hello. What's the purpose of that second capacitor (0.33uf) across cathode of the KT88. You already have a 220uf. Thanks
those two capacitors are not of the same type, ppe transmits higher frequencies much better
looks good. Can this handle 4ohm speakers ?
with a 4 ohm transformer, yes. my speakers are 8 ohms so I used that transformer. has transformers with 4, 8 and 16 ohms...
Well done
Hello, Can you provide your honest opinion on PrimaLuna Evo tube amplifiers and in particular Evo 400 Tube Integrated Amplifier. What is meant by Triode and Ultra Linear? Thanks.
What is the minimum speaker impedance that we can connect and what is the wattage?
my transformer is 8 ohms but can be put in 4 or 16 ohms.
the power of the amplifier is
P (triode) = 7.6W
P (ul) = 9.8W
accordingly, speakers with a higher sensitivity of 91dB and higher are used
Super krasna pojačalo, vjerovatno i rade dobro.Razmisljao sam da naruci iz kine pojačalo ali onda sam pronašao vas klip na YT. Interesuje me dali je moguce kupit jedno takvo pojačalao i koliko bi kostalo odprilike, jedno od ta dva na vasem klipu ili da vi napravit?! Za zvucnike B&W 685 S2.
Unaprjed hvala Damir
hvala na komentaru. Ne prodajem pojačala, ali sam voljan pomoći (savjetima, linkovima...) ako isto želite sami sagraditi. Treba samo malo dobre volje i strpljenja.
Hi Robert, it is possible to find out more about the on / off switch? Which switch and which schematic (relais?) do you use? Where can you get these parts?
Timer: www.aliexpress.com/item/32842803323.html?spm=a2g0s.8937460.0.0.7c182e0e750YbH
Switch like this: www.aliexpress.com/item/1349154192.html?spm=a2g0s.8937460.0.0.2f432e0e4qMCJb
So, when you sending me this to try my iems with it ?
Where can I buy the necessary parts? . I am a total newbie... Don't have any idea to built this but want to learn.. Any help is appreciated. Thank you.
Great job !
Thanks
And you forgot to show the schematic of how to hook this into the flux capacitor
hello again Sir. One other question. whats the quiescent current on those KT88's (Iq)? thanks!
74 mA class A
@@RobertZovko Thank you! I also have it low biased in mine, but I find that it has a THD of 8% in triode mode. Will try to bias it a little hotter to lower that. Did you happen to measure the THD in yours?
Bravo, Beautiful. Mister Robert, do you know approximate cost of elements used to finish project?
These comments are read by my wife.
@@RobertZovko hahaha :)