Arash Mafi

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@watcherwatchmen7785 25 күн бұрын

Thanks for your video Arash. Where did you source the plastic core?

@ARASHMAFI1 23 күн бұрын

@@watcherwatchmen7785 I think i sourced the bobbins through eBay sadly I haven’t been able to find the sellers store lately

@gailsmith9835 Ай бұрын

My favorite electronic component-the fist size output transformer. And God forbid an equal size interstate driver trans.

@mariorivas6259 Ай бұрын

Its in good condition or not?

@bertitolino Ай бұрын

Such craftmanship done by beautiful hands ☺

@hobbyrob313 Ай бұрын

Very nice to see all of it! And winding a transformer yourself man man man how beautiful. I just tinker with… all sorts of things and honestly tubes win as far as I'm concerned. Well and honestly I tinker a lot with pirate transmitters on FM and on SW (in AM modes) but you can make everything yourself, even a modulator transformer and nothing can beat that! Healthy and Friendly Greetings from the Netherlands! Rob

@DXingSlovenija 2 ай бұрын

Why are ouput wires (the color wires) bigger then tiny wires u wound ur core with? Also, why do u need metal plates, what would happen if u wouldnt use them? Also does it matter how many u squize in there? PS: is there any lacker or glue or warnish that wouldnt delaminate over the years making transformer hum?

@vortextube 2 ай бұрын

Way to go man. Looks like livin the dream. Keep building and innovating.

@youcefbouheraoua6160 2 ай бұрын

Hello Arash, very informative thank you. I would like to learn how to make the measurements shown at the end (equipment and procedure). Thanks

@KonstantinGrigoriadis 2 ай бұрын

Nice Build ! Can you show the wiring of the socket boxes and the Socket Receiver too ? I customized my Roetest build alot too made all mostly out of PCB FR4 Material. I made a Whole Video Series on KZbin about my Build of it.Cheers, Konstantin

@ARASHMAFI1 2 ай бұрын

Thank you! Your build has also been very inspiring! I will do a second video covering the socket boxes! I’ve been a follower of your channel and love all the topics you post about

@KonstantinGrigoriadis 2 ай бұрын

Hello, Thankyou !

@vicenteponsrequena6427 3 ай бұрын

Excellent video. Very well illustrated, even with direct drawbacks!! Showing assembly reality, and its possible problems!!! Congratulations 😊 !!!

@JedHelmers 3 ай бұрын

Nice work

@Rhuggins 3 ай бұрын

Absolutely GORGEOUS

@Steven-pv1xr 4 ай бұрын

Just be very carefull with those long plate leads. You cab set up a RF oscilation

@ARASHMAFI1 4 ай бұрын

@@Steven-pv1xr noted ✅

@barrymayson2492 5 ай бұрын

I doubt this comment will be noticed but i use a lot of magnet wire for winding coils and i use a knipex stripping tweezers. They are brilliant and clean top and bottom at the same time cleaning is much faster and cleaner. Just thought i would mention it.

@al-rpv5594 6 ай бұрын

Стрелки все портят !😮

@kiarashalimi937 7 ай бұрын

Pashmaam

@ARASHMAFI1 7 ай бұрын

Merci

@jonathanhorne6503 8 ай бұрын

Proves my point. I’ve accused you before of having mad skills. What can I say. Point proven.

@ARASHMAFI1 8 ай бұрын

🙏🙏🙏

@Rhuggins 8 ай бұрын

I would definitely buy this oh my GOD its such a beautiful circuit

@ARASHMAFI1 8 ай бұрын

Thank you for your support

@vicursh 8 ай бұрын

Всё плохо,... Можно сделать лучше, например kzbin.info/www/bejne/naS9o3aIrc6IgNUsi=lP0G5toxYhtlvp6M

@jmikronis7376 9 ай бұрын

That Kapton tape is a very good material to secure wire with. It has become very expensive. Regular yellow tape is a good second go-to material (inexpensive) to wrap transformer windings with.

@fl7210 10 ай бұрын

Nice work

@FloydAtema 10 ай бұрын

I love the seventh about as much as I love tube gear! Perfect video.

@claesmansson9070 11 ай бұрын

No fancy winding machine needed, building one from Lego is possible and it also goes back and forth, video available.

@ARASHMAFI1 11 ай бұрын

lol perfect

@dm.2023 11 ай бұрын

Beautiful! How do you calculate the number of turns per winding for the required impedance, wattage etc?

@saeedjahangiri6861 Жыл бұрын

Hi Can I ask from which procedure you use to calculate the number of layers and its arrangement for P and S

@ARASHMAFI1 Жыл бұрын

Hi Saeed, I highly advice to get the book RCA Radiotron Designer’s handbook fourth edition, this book will have all the math and in depth info

@gabrielpowers766 Жыл бұрын

Why the paper between the two iron casing sections?

@ARASHMAFI1 Жыл бұрын

Since this is a single ended transformer the core needs to be air gapped so it doesn’t saturate, the air gap can be calculated and measured and added by paper.

@ПетрТабаков-ж1щ Жыл бұрын

Классный станочик!😅😅😅

@surninonline Жыл бұрын

Где можно купить?

@ARASHMAFI1 Жыл бұрын

Sold

@Toms3200 Жыл бұрын

Hi, Nice VU meter. What’s the sensitivity of the meter this circuit supports (FSD) ? Will you give circuit details if I buy the Pcb from Ebay ? Thank you

@ARASHMAFI1 Жыл бұрын

It can be anywhere from 50uA-2mA from what I’ve tested

@ARASHMAFI1 Жыл бұрын

The pcbs come with all BOM silkscreened and additionally BOM can be emailed to you

@borisj4054 Жыл бұрын

No real information here. Ion area/volume or turns / volt info. Not able to duplicate.

@ARASHMAFI1 Жыл бұрын

My intention wasn’t to make a video for others to duplicate, it was to show how I go about winding a transformer.

@manojpradhan170 3 ай бұрын

Thanks sir

@josephcalvet3296 Жыл бұрын

Arash, I own a high end stereo, 1950s ampeq amplifiers, Fulton j speakers from the late 70s. The input transformer for one of the rtr tweeters is open, I have owned this system since the 1980s, I am reaching 70. Do you know where I can get this repaired or replaced. You do beautiful work by the way.

@reareochannel4470 Жыл бұрын

cool friend.. What I want to ask is, what size coker (wire housing) are you using in this video???

@ARASHMAFI1 Жыл бұрын

The size of the bobbin ?

@reareochannel4470 Жыл бұрын

@@ARASHMAFI1 Yes, that's right... what size is your bobbin in this video

@ARASHMAFI1 Жыл бұрын

@@reareochannel4470 if I remember correctly the window of the bobbin core cross section was 63mmx39mm

@jetblakink Жыл бұрын

Mesmerising... Excellent upload.

@microlatinamicrocontrol1240 Жыл бұрын

Dear Arash, could you please let me know if this frequency response test shown is being done under working conditions, such as DC bias at the primary of your transformer and also secondary winding load conditions. Thank you !

@ARASHMAFI1 Жыл бұрын

Yes this was taken under working condition

@derlissi9754 Жыл бұрын

Great video, but the music is not necessary

@ARASHMAFI1 Жыл бұрын

Sorry you don’t like the music but It was playing in my living room during the shoot, and I didn’t want to spend 6 hours winding in silence…

@stevencraig 5 ай бұрын

The music was just as necessary as your comment. You can simply turn down your device volume.

@erwinflores6364 Жыл бұрын

Using solid state in PSU?

@ARASHMAFI1 Жыл бұрын

Yes solid state power supply with maida style regulator

@m_c_8656 Жыл бұрын

nice!

@sameerato Жыл бұрын

sir. what is software finaly transfomer checked . thanks

@chrishoffman6537 Жыл бұрын

Good stuff!

@scottschmittmusic Жыл бұрын

Dig it?😊

@whittamps Жыл бұрын

How do I order more?

@ARASHMAFI1 Жыл бұрын

Hi would you like the single channel or dual chan? I can upload to my eBay store or I can invoice you directly

@whittamps Жыл бұрын

@@ARASHMAFI1 single channel balanced input with peak LED

@ARASHMAFI1 Жыл бұрын

@@whittamps I’ll send you the link shortly

@whittamps Жыл бұрын

@@ARASHMAFI1 thanks

@ARASHMAFI1 Жыл бұрын

@@whittamps hi there, here is the link for the single channel: www.ebay.com/itm/145188746410?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=aVgWzFi9SWC&sssrc=2051273&ssuid=aVgWzFi9SWC&var=&widget_ver=artemis&media=COPY

@uniteddrones7626 Жыл бұрын

Can I send you a few to repair for me? I have a power supply that hasn’t worked in a year because of a blown transformer an cannot find a replacement

@uniteddrones7626 Жыл бұрын

How can I find ur email? I messaged ur instagram

@Rod_Knee Жыл бұрын

This looks great. Any chance of a link to the schematic? I've just got hold of some NOS 807's, myself.

@christiancavan3033 Жыл бұрын

What is the size of bobin you using

@ARASHMAFI1 Жыл бұрын

If I remember correctly it was designed around EI114 core

@mikemoscaritolo1799 Жыл бұрын

Arash is the MAN :-) !! I found him from this video. I had a very expensive Laboratory Instrument that is End of Life, No parts or service available from the original manufacturer. A Transformer was burned out on one of the boards. I removed it and sent it to Arash. This was a very difficult transformer, completely vacuum coated in epoxy. It took him a long time to remove the epoxy and unwind all of the different voltage layers, counting as he removed each layer. In the end he did a great job. Unfortunately, it fixed the original problem but revealed another problem, so the instrument still is out of service. It was still worth the gamble. His price for the job was reasonable. A used instrument the same age, also End of Life is $6,000. A New instrument is $60,000. Thank You ***AAAA***

@ARASHMAFI1 Жыл бұрын

Thank you Mike! I appreciate your kind words and it was fun hand winding that beast !

@duffharris9295 Жыл бұрын

Do you mind sharing some info on this build? Thanks.

@RobertHallIV Жыл бұрын

For the life of me, I'll never figure out why the audio industry has all but abandoned the use of almost any transformers in audio circuitry. For starters (pun intended), in the audio input section, a 600:600 ratio isolation transformer is like magic. Literally eliminates all ground and spurious noise. In the final output section, God forbid your output transistors short and supply bias DC voltage to your speaker cabs. You'll be replacing voice coils. Whereas, a transformer to deliver the signal to your speakers, transformers do not pass solid DC voltage. Problem solved.

@pouyan225 Жыл бұрын

I guess like most things in our times, it comes down to one word: Money

@shamimahmed4556 Жыл бұрын

@@pouyan225Yes. It's money that counts. Nobody is going to pay for durability and use and throw method is adopted. In terms of high-end and quality still prevailing in India. Stranger, Ahuja, Philips India still making mfg transformer based PA amplifiers although costly.

@jmikronis7376 9 ай бұрын

@@shamimahmed4556, yep, overall cost is the god they worship and where the gold ($) flows in from.

@jmikronis7376 9 ай бұрын

I’ve started making some hand wound transformers out of salvage units. No, I didn’t buy these units. I’m doing it for myself.

@RobertHallIV 9 ай бұрын

@@DonnieLuve I know a little known fact about warm sounding audio like from tube amps. It's not just the tubes that give you the warm, fuzzy. I've found out through research and R&D that transformers on the input and output stages incredibly changes the sound giving it a nice, highly dynamic sound.

@ericwilson2585 Жыл бұрын

I was just wondering if stagger stacking the I's and E's makes any difference in the transformer's response or efficiency?

@ARASHMAFI1 Жыл бұрын

Probably not much, I’ve only seen that method on older laminations with lower Gs

@gmant123 Жыл бұрын

Very good job!, I would like to know how test these transformers! Can you tell us please?

@faizalmansaralam4229 Жыл бұрын

Very good needle response 👌👌. Is the driver circuit self designed?

@ARASHMAFI1 Жыл бұрын

Thank you, yes it is and I have PCBs available in single and dual channel

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