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.
@@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.
@@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.
Excellent video, very informative. I plan on winding my own output transformers in the future with an audio amplifier, and this video was very informative of the technique. Many thanks.
Glad someone else has stumbled upon this all-too-forgotten truth about how versatile and necessary transformers play in audio circuitry. I'm developing some things now that I can't figure out why no one else is using. It's a godsend.
Looking forward to the potting and finishing video. Where did you source the winder? I also would be interested in a detailed listing of the parts (and their source) used in the making of this transformer. How did you determine the parameters (wire gauge, turn numbers, air gap thickness, etc) needed? Thanks.
I thought that the transformer formula was in metric, such as core square CM. Also gauge of wire formula is as 700circ mils times current times duty cycle. If power not on all times during time period , then the gauge wire can be smaller. circ mils times % duty cycle. Also, if choosing a LARGER core than required, then there is less turns that have to be wound on bobbin because of formula. Assembling a low frequency transformer with E and I laminations can be interleaved, or separated , so as the top I set comes off, so as bobbin quickly removed for rewinding. The separate laminations type requires strap over unit to hold together. The old style radio chokes were like that method.
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.
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.
Thats awesome! What a nice job that would be,sitting home winding custom transformers,to any spec. I wonder what the winding machine and controller costs?I think you could make a good living wage too ! will he talk to us? I am in europe so would not steal any of his customers.I go search transformer winding machine! Or diy home made one to experiment with SE output transformers.
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 $60,000. Thank You ***AAAA***
I need a machine like this. I’m winding mic input and output transformers for line level. M6, nickel, metglas, and MPP. I wind by hand right now. It’s getting exhausting.
Awesome! I also have a hand crank one as well, the cheap ones you can find on eBay from China, I think they are cast iron. those are great for pickups and small coil, but they are really hard on your wrist!
Since this is a single ended transformer the core needs to be air gapped so it doesn’t saturate, the air gap can be calculated and measured and added by paper.
Dear Arash, could you please let me know if this frequency response test shown is being done under working conditions, such as DC bias at the primary of your transformer and also secondary winding load conditions. Thank you !
That Kapton tape is a very good material to secure wire with. It has become very expensive. Regular yellow tape is a good second go-to material (inexpensive) to wrap transformer windings with.
For the life of me, I'll never figure out why the audio industry has all but abandoned the use of almost any transformers in audio circuitry. For starters (pun intended), in the audio input section, a 600:600 ratio isolation transformer is like magic. Literally eliminates all ground and spurious noise. In the final output section, God forbid your output transistors short and supply bias DC voltage to your speaker cabs. You'll be replacing voice coils. Whereas, a transformer to deliver the signal to your speakers, transformers do not pass solid DC voltage. Problem solved.
I guess like most things in our times, it comes down to one word: Money
@@pouyan225Yes. It's money that counts. Nobody is going to pay for durability and use and throw method is adopted. In terms of high-end and quality still prevailing in India. Stranger, Ahuja, Philips India still making mfg transformer based PA amplifiers although costly.
@@shamimahmed4556, yep, overall cost is the god they worship and where the gold ($) flows in from.
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.
@@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.
Excellent video.
Very well illustrated, even with direct drawbacks!!
Showing assembly reality, and its possible problems!!!
Congratulations 😊 !!!
Excellent video, very informative. I plan on winding my own output transformers in the future with an audio amplifier, and this video was very informative of the technique. Many thanks.
Glad I can inspire and help! Thanks for checking my channel out
Where to get the core material is here in Holland a problem
Glad someone else has stumbled upon this all-too-forgotten truth about how versatile and necessary transformers play in audio circuitry. I'm developing some things now that I can't figure out why no one else is using. It's a godsend.
Hello Arash, very informative thank you. I would like to learn how to make the measurements shown at the end (equipment and procedure). Thanks
Excellent video and even better with Barry Lyndon soundtrack!
Thank you!
Händel
Looking forward to the potting and finishing video. Where did you source the winder? I also would be interested in a detailed listing of the parts (and their source) used in the making of this transformer. How did you determine the parameters (wire gauge, turn numbers, air gap thickness, etc) needed? Thanks.
Nice work
I thought that the transformer formula was in metric, such as core square CM. Also gauge of wire formula is as 700circ mils times current times duty cycle. If power not on all times during time period , then the gauge wire can be smaller. circ mils times % duty cycle. Also, if choosing a LARGER core than required, then there is less turns that have to be wound on bobbin because of formula. Assembling a low frequency transformer with E and I laminations can be interleaved, or separated , so as the top I set comes off, so as bobbin quickly removed for rewinding. The separate laminations type requires strap over unit to hold together. The old style radio chokes were like that method.
Beautiful!
How do you calculate the number of turns per winding for the required impedance, wattage etc?
The suspense! I break the wire too often. Nice setup!
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.
Классный станочик!😅😅😅
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.
Interesting video! Cool to see how those transformer coils are made. 👍 Im having a cold too, take care of yourself!
Nice video! Thank you! What is the reason for not alternating the E’s and I’s?
For single ended application this is how the laminations are inserted to create the air gap needed
Hi Arash, can You please share th link for testing program in the end. Thanks!
It is very informative and detailed explanation. Thank you very much
Thats awesome! What a nice job that would be,sitting home winding custom transformers,to any spec. I wonder what the winding machine and controller costs?I think you could make a good living wage too ! will he talk to us? I am in europe so would not steal any of his customers.I go search transformer winding machine! Or diy home made one to experiment with SE output transformers.
I was just wondering if stagger stacking the I's and E's makes any difference in the transformer's response or efficiency?
Probably not much, I’ve only seen that method on older laminations with lower Gs
This is real art !!! 👌❤
Very good job!, I would like to know how test these transformers! Can you tell us please?
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***
Thank you Mike! I appreciate your kind words and it was fun hand winding that beast !
Mesmerising... Excellent upload.
Was the purpose of the paper, just to create the air gap?
Yes exactly!
Hi
Can I ask from which procedure you use to calculate the number of layers and its arrangement for P and S
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
I need a machine like this. I’m winding mic input and output transformers for line level. M6, nickel, metglas, and MPP. I wind by hand right now. It’s getting exhausting.
Awesome! I also have a hand crank one as well, the cheap ones you can find on eBay from China, I think they are cast iron. those are great for pickups and small coil, but they are really hard on your wrist!
@@ARASHMAFI1 it takes me about 3.5hrs to wind a 1:7 or 1:10. Is there a significant time savings with the machine you have?
@@mattportnoyTLV wow, you could wind a dozen in that time
@@ARASHMAFI1 oh, that’s crazy. Sounds like it would be well worth the investment. What are they, like $700 or something?
@@mattportnoyTLV yeah that’s the ball park 750-800$ and they are worth every penny, it’s a cnc winder and it’s perfection!
cool friend.. What I want to ask is, what size coker (wire housing) are you using in this video???
The size of the bobbin ?
@@ARASHMAFI1
Yes, that's right... what size is your bobbin in this video
@@reareochannel4470 if I remember correctly the window of the bobbin core cross section was 63mmx39mm
How did I choose the required wires, what is the approved law, please clarify
sir. what is software finaly transfomer checked . thanks
Very good job, great video
What equipment/software did you use for testing?
A good program to use is AP audio precision
What is the size of bobin you using
If I remember correctly it was designed around EI114 core
Good stuff!
Dear how to select the exact size of bobin for exact watt?
Why the paper between the two iron casing sections?
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.
Nice project! Well done Arash.
Thank you!
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
How can I find ur email? I messaged ur instagram
Great video and channel, where do you get the forms? I’m having a hard time finding small quantities
The bobbins ? I ordered some from a local company here in LA that makes amps
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 !
Yes this was taken under working condition
Proves my point. I’ve accused you before of having mad skills. What can I say. Point proven.
🙏🙏🙏
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.
Thank you! What are the dimensions/wire diameter/turns/material please?
It’s all in the beginning of the video pause and take a screenshot
@@ARASHMAFI1 I see only a brief shot of a wire coil.
@@steputube 2:36 pause on it
No fancy winding machine needed, building one from Lego is possible and it also goes back and forth, video available.
lol perfect
could you show how set Up the OT for both test?
I will post a follow up video that will go through the process throughly. Stay tuned!
puoi fare un video come realizzare un trasformatore PP
Do you sell on eBay?
Right now I am not selling transformers and sorta only making them for my own projects, but I am open to custom orders if you need any made !
I want a way to contact
@@notegoodluck3546 arashmafi1 atttt gmail d0t com
Thank you .
At least now, I know I can’t do it.
So jealous. Ha!
Great video, but the music is not necessary
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…
The music was just as necessary as your comment. You can simply turn down your device volume.
No real information here. Ion area/volume or turns / volt info. Not able to duplicate.
My intention wasn’t to make a video for others to duplicate, it was to show how I go about winding a transformer.
Thanks sir
Всё плохо,... Можно сделать лучше, например ruclips.net/video/gsZrCRxiUJs/видео.htmlsi=lP0G5toxYhtlvp6M