STC Electrodynamic Speaker Field Coil Rewind - 1930s

[@enoz.j3506]

From an old timer, electronics engineer that was a great watch. Thank you Dave.

[@DavidTipton101]

Thank you @enoz.j3506 👍🙂

[@TheUltimateRecycler]

"It can't be too hard" is a statement that can get many of us to the depths of despair! Great work Dave, yet again! 👌👏

[@DavidTipton101]

Thanks Chris. Famous last words 😄

[@Rene_Voortwist]

Wow Dave, I'm still amazed at the lenghts you go to restore vintage radio equipment. What a fantastic job you did here! I really enjoyed this, thanks!

[@DavidTipton101]

Thank you Rene. I'm glad you enjoyed it 😊

[@BrianTheRedLionGR]

Great videos as always Dave Merry Christmas 🎅 all the best Brian 🇬🇧👍🇦🇺🍻

[@roberthart8933]

Hi Dave. I found myself holding my breath watching this. Winding 1.8km of fine wire and solving the breaking issue. Well done. I reckon refitting loudspeaker cones must be one of the most fiddle parts of radio repair. These speakers would have been expensive to make.

[@DavidTipton101]

Hi Robert. It was difficult at this end too. I was waiting for it to break again. Very complex speakers, they would have added quite a bit to the radio cost. Thanks Robert 👍🙂

[@iantyler4045]

Dave your skills never cease to amaze me. The description of how electrodynamic speakers work was very clear and understandable. I have restored a slightly newer STC model (536) which has the same setup but fortunately the electrodynamic coil was intact (but not the speaker transformer). A pleasure to watch your work as always.

[@DavidTipton101]

Thank you Ian. Don from Don's Old Rado Shed is doing a 230 which is the same chassis I think. His is a very neat radio 🙂

[@grahamrdyer6322]

There is only one person in the world that would have done that and that is you, well done Dave.

[@DavidTipton101]

Well... I think others could do it too 😄 Thanks Graham 👍

[@Ragnar8504]

@@DavidTipton101 Maybe they could but I doubt anyone would actually do it!

[@kenrolle2338]

Thank you Dave for the explanation of a hum bucking coil. I've heard the term many years ago but never knew how it worked.

[@DavidTipton101]

My pleasure Ken. It seems we both learned something 🙂

[@kimhenry5658]

And here’s a cheer from Tasmania.

[@DavidTipton101]

Harrah... thanks Kim 👍😄

[@falksweden]

That's a proper job, Dave! And a lot of us learned something new too! Happy new year to you and the family!

[@DavidTipton101]

Thanks Kristian. Happy New year 👍🙂

[@johnrichardson7354]

Dave, You make this old Tandy Radio Shack Engineer happy watching you. Great Job.

[@DavidTipton101]

Thank you John 😊

[@jerkerfridh8189]

Dear Sir, thank You for yet another year of entertaining and educational radiorestoring. Alongside Manuel, You are the one that I allways refer to when asked upon the subject of old electronics. All the best to the Tipton Family❤

[@DavidTipton101]

Hello Jerker, thank you. All the best to you too Jerker, see you in 2024 👍😀

[@f.k.burnham8491]

I had to recone several speakers over the decades. I never had to rewind a field coil though. The hardest part is getting the voice coil centered. I was able to order kits that came with the alignment shims and special glue for the cone to frame. Great job!

[@DavidTipton101]

Getting the voice coil centred can be tricky, there is not a lot of tolerance there. We don't have access to recone kits as such here, at least not at a reasonable price. We can get speaker components from China but they seldom fit these old speakers. Thanks FK 🙂

[@dogribmoon]

I have been waiting for your latest adventure. You never shy away from a challenge.

[@DavidTipton101]

Thanks dogribmoon. I'm not smart enough to know better 😉😄

[@hijmestoffels5171]

I didn’t read the caption of this video well enough and thought mr. Tipton had gone insane, rewinding the voice coil. But it was just the field coil. Piece of cake 😜!

[@DavidTipton101]

I'm not that crazy... yet! 😄 thanks Hijme.

[@DrFiero]

I can't imagine the patience of the guys ~100 years ago, needing to do the coil winding by hand & eye!! As for the new wire you got, it's probably a more brittle alloy, or they didn't anneal it enough so it was brittle. Success in the end though! Fantastic.

[@DavidTipton101]

Thanks @DrFiero. I wish I had as source of better wire, that would go a long way to better results🙄

[@stuartirwin3779]

Even a century ago, they had very good automatic coil winders, which operated at very high speed. All mechanical counters, of course, but programmable with selectable cams, gears etc.

[@DrFiero]

@@stuartirwin3779 - Oh wow! Had no idea. Was picturing some guy with a machine like a sewing machine pumping a peddle, holding a spool of wire... and REALLY concentrating on his work. ;)

[@mauricedarmody4424]

Brilliant! thanks for all you help this year and long may it continue, and a merry Christmas and New Year to you and your wife. England

[@DavidTipton101]

Thanks you for your support Maurice. Merry Christmas and all the best for the new year🎄😀

[@electrosoundaust]

Nice radio the STCs. Just watched Don doing one. So twice the pleasure this evening!

[@DavidTipton101]

I started watching Don's video but dinner interrupted, I will get back to it later. Thanks Andrew 🙂

[@BoB4jjjjs]

I learn something every day, that speaker coil is new to me. Well done, I don't think I would have taken that on!

[@DavidTipton101]

Hi Bob, thank you. It's a daunting task, luckily it worked OK 🙂

[@stephencopeland238]

It's like watching magic in front of me..... Absolutely amazing........ Pure genius!!!

[@DavidTipton101]

Thank you Stephen 🙂

[@ninaevans4501]

Added comment to the last one. Fantastic (and informative) video once again Dave. At 52, we just wish we had your patience. Bonzer Mate. Wayne & Nina 👍👍👍👍👍👍🫡🫡🫡🫡🇦🇺🇦🇺🇦🇺

[@DavidTipton101]

Thanks Wayne and Nina, I wish I was 52 🙄🤣

[@CASHSEC]

We are all learning from you Mr Tipton. The first time I heard about humbucking was learning some info on the Gibson sun burst Les Paul guitar. They have humbucking coils in them but I never knew what they did. At 74 I do now. Thank you😊

[@DavidTipton101]

Good, thanks for the feedback @CASHSEC 👍🙂

[@peterkutas1176]

WOW, I felt your agony each time the wire broke!

[@DavidTipton101]

You and me both Peter 😄

[@Donno308]

Wow, nice job! I'm sure the owner will be happy. I've never seen a field coil rewound before and I'm sure you couldn't have done that with your old winding machine, even after you modified it! A bit strange, your wire having a different resistance per meter to the old stuff. Looks like matching the DC resistance was the right way to go. Trying to match the number of turns would probably end badly, especially with the length of wire required per turn increasing with the effective diameter. What a coincidence that we both released videos about 1930's STC radios at exactly the same time!

[@DavidTipton101]

Hi Don. Thanks. I'm just watching your video now. I couldn't work out the resistance difference either. You would think it would be the same. I was originally going to match the turns but I couldn't get the old coil off in one piece and then I realised the resistance would be way out. The metre measuring wheel worked well to, a last minute purchase for China. I could believe it when your video popped up, people will think we are in cahoots 😄

[@mackfisher4487]

You two are part of the Australian radio restoration Mafia, that seems to have a goal to raise the bar in the community.@@DavidTipton101

[@Ragnar8504]

@@DavidTipton101 I'm not all that surprised about the difference TBH. Slightly different alloys seem to differ in resistance quite a bit. I've heard some complaints about large mains wires (50 mm2 and up) no longer fitting into crimp connectors because the manufacturer used higher grade copper so the diametre ended up being too small for the crimps.

[@manFromPeterborough]

I got given a Rola version of this speaker at primary school Y6 of '83 by one of the kids, I took it home to plug into my 1w Audiosonic tape radio, I barely got sound with radio fullblast, I thought the voice coil was 2000 ohms, since that was stated on the speaker, What a feeling by Irene Cara was playing. the speaker had the tin cup cover and screen voice coil cover. I brought it back toschool telling the kids the speaker is too big for the taperecorder, they had a great time unravelling the field coil while wrecking the speaker

[@DavidTipton101]

You had a lot of speakers to destroy there vaughn 😀

[@manFromPeterborough]

My cousin Jim had a late 50's Hotpoint by AWA radio gram in his bedroom when he lived at his mum's back in the 80's, he told me about the gram at Joanne's wedding late 84, I asked many questions about it, he said the speaker is 4 ohms 4w. I imagined it might have a field coil Rola. I also imagined it would sound good with Durran Durran Wild Boys played full blast. When Jim's last CRT TV went, he had no room for the gram, a widescreen TV was coming in, he said I can have it and 2 dead CRT TV in 2010. I took the CDs and papers out of the record compartment when I collected it from verrandah while he not home, he rung up and said I told you to take everything out of it, demanding the records back, he wanted Rock around the Clock 78 and 2 Les Paul 78's back and Tom Jones Green Grass of Home album ( that song was used on his photo slides after his passing 2 yrs ago). A 6BV7 valve and MSP 12PW 6.5 ohm and 5" 3 ohm in Hotpoint radio gram. For some reason the record player sound extremely tinny, BSR with ACOs cartridge@@DavidTipton101

[@greggsvintageworkshop8974]

Awesome work on the speaker coil Dave! I LOVE your coil winder sir! Great parts you printed, the form for the field winding, as well as the centering tool, Great idea! Very nice job!

[@DavidTipton101]

Hi Gregg, thanks. I will admit the coil winder is a thing of beauty, it's not perfect but a very nice unit. Our 3D printers are very handy, the transformer spools work well, I use ABS for those so they are good to over 100C 🙂

[@Ockhamcool]

Love this video! So real. I went through many of these same discoveries when winding guitar pickups and other coils which also use very fine wire. I built a coil winder to do just what you're doing. Again, THANK YOU for showing the failures, not just the sucess. We learn so much more from seeing failures than from glib and glossy edits of reality.

[@DavidTipton101]

Thank you @Ockhamcool. It's steep learning curve 🙂

[@jake359nl]

Oops...he did it again..!! Thought it couldn'd be done but here's Dave..!! Wow! Such skills and determination. 👏👏

[@DavidTipton101]

Haha... thanks Jake 😄

[@batman387]

Great video. I learned a lot. Good to see you. Take care! 😀

[@DavidTipton101]

Thanks Batman 🦇

[@Peter-yt7xm]

Thanks David. I use 600 ml coke bottle for shims on my speakers. The part of the bottle where the label goes around give you about 40 mm in length and they have a nice curve in them. As for the rest of the repair, just wow. You truly are a master craftsman.

[@DavidTipton101]

Hi Peter, thanks. Good idea with the curved coke bottle, I will have a look 👍🙂

[@JE-hm7jw]

Good Show & Merry Christmas from the Texas Hills

[@DavidTipton101]

Thank you JE and Merry Christmas to you 🎄😀

[@alpcns]

Well done David! Speakers are tricky things. I am sure the owner will be delighted with the results.

[@DavidTipton101]

Thanks alpcns. the owner was very pleased 🙂

[@dianeramakers3368]

Goodmorning from the Netherlands Dave. Really cool, rewinding a speaker coil.

[@DavidTipton101]

Thank you Diane 👍😀

[@Stephens8x6Workshop]

Brilliant Dave, never tire of watching your video's. Just watched Dons radio channel and ripped him off a strip for publishing a video on what should have been my last afternoon in the workshop before my Christmas break only to find a notification for you too! Well I just had to watch you both so looks like I'll be working late ha ha. All the best to you and yours for the season mate. Your ingenuity never ceases to amaze me.

[@DavidTipton101]

Hi Stephen. Thank you, sorry to keep you up 😄 I shall have a word to Don about our conflicting video release dates. I checked his video metadata, he released his three minutes after mine so I have the moral high ground 😅 Thanks Stephen, Merry Christmas and all the best for 2024 🙂

[@jamied2108]

Speaker field coil repair is a task I have not yet to endure. Great vid gives us a preview and a roadmap on how to repair these type of devices

[@DavidTipton101]

Good luck if you attempt one Jamie, it wasn't hard once I figured a few bugs out 🙂

[@vicmabus1532]

Wow! Wouldn't have thought a repair like this would be possible! Tou saved another!

[@DavidTipton101]

Thanks Vic 👍🙂

[@vicmabus1532]

[You]

[@electronicsoldandnew]

Really enjoyed that, thanks Dave. Really liked the graphics. 👍 👍 👍

[@DavidTipton101]

Thanks Manuel. I knocked the graphics up in a few minutes 🙄😄

[@aa1ww]

The other commenters have said it all but I just have to add my compliments and thanks. I have reconed or replaced surrounds on some expensive hifi speakers and fortunately the supplier provided a video and shims, etc. You're detailed treatment is reference quality work to which others will refer for some time. Also, I appreciate your intuition on the mechanical details as well as the electronic. It was so satisfying to learn about and see how you solved the voice coil alignment. God Bless you and yours, Coop ps: Don, @RestoreOldRadios, is an excellent restorer and very generous of his time and experiemce.

[@DavidTipton101]

Thank you Jeff. It is uncharted waters for me but fun to work out how to do it. I will learn form what I did and be better next time hopefully. You I agree, Don wrote a comment and was very helpful 🙂

[@gwesco]

The fact that you have a CNC coil winder just floors me! BTW, Don gets into a lot of the theory and math to explain what he is doing. It's a great channel in addition to yours.

[@DavidTipton101]

Thanks George. The CNC machine was kind of a gift from my wife when I was spending too much time with my fabricated one. I have watched a bit of Don's channel, he's good 👍😊

[@ripleysmith7583]

Great job saving that speaker. Putting all the fun toy to use.

[@DavidTipton101]

Hi Ripley. It always a good day when I can play with my toys 😄

[@AMStationEngineer]

I hope that Don, RestoreOldRadios views this, he's the only person whom I know (in the northern hemisphere) who's skills-set is adept enough to tackle field coil rebuilds, en-total. Congrats on a job well done! Merry Christmas to you and your's Dave, and your many friends at the other end of the earth! (polyamide fans unite!; that's all I use for harnesses!)

[@DavidTipton101]

Hi Tim. There were very few people doing speaker field coil rewinds, Don had quite a few videos on the subject, it would be nice if he sees my effort. Thank you. Merry Christmas and all the best for 2024 🙂

[@kfl611]

Great job, thank you for sharing with us ! I'm glad you helped rescue and preserve a nice old radio. I love the dial, looks so neat ! I feel like I've stepped back in time, looking at that dial.

[@DavidTipton101]

Thanks you kfl611. It is a very nice looking dial 🙂

[@robschertler8099]

Nice work, Dave. And thanks for including the animation for the field coil speaker. Well done.

[@DavidTipton101]

Thanks Rob. My pleasure 😊

[@raymondmenard5444]

Hi Dave, you say you learned a lot on this one, oh boy imagine me ! It was fascinating seeing you make the calculations and i was on the edge of my seat watching the wire getting wound on the bobin after the 1st break. But i felt so relieved when the winding was finally done. Speaker sounds amazing now. Bravo ! well done once again, another one saved :-)

[@DavidTipton101]

Hi Raymond. I did need to do some research on this one, what to look out for, winding directions etc. I knew how a humbucker worked but I needed the finer points. I hope we all learned something from this exercise. I was pretty relieved when the winding was finished too 😅 Thanks Raymond.

[@Elektronenregen]

It felt bad to see the wire break and I was hoping, that it would not tear apart at like 3/4 of the length :). Very interesting with the humbucking coil! Cool to see, that they used methods like that back then. Thank you for the very interesting video!

[@DavidTipton101]

Thanks Elektronenregen 🙂

[@stevescheberle277]

Thanks Dave, that was a humbucker of a job. We got to see all of the fun gizmos like the way cool winder, 3D printed alignment tool, and the perfectly laser cut dust cap. Steve will be very happy, I'm sure. Merry Christmas to you and yours! 🎄🔔🎄

[@DavidTipton101]

Haha... a humbucker indeed 😄Thanks Steve and Merry Christmas 🙂

[@stephengorin3059]

You keep on amazing me with the amount of detail and effort that you put into restoring these radios. Well done and give yourself a pat on the back. I hope the owner will be happy with all the hard work that you have put in. Have a merry Christmas Dave !!

[@DavidTipton101]

Thank you Stephen. The owner was very pleased to have his radio working again. Merry Christmas 🎄🙂

[@chrissmith7655]

Hi Dave, great job , as usual. I am sure we all learned a lot watching this video, keep 'em coming ,please. Many thanks from Nr Liverpool UK.

[@DavidTipton101]

Thank you Chris. It was a bit of learning for me too 🙂

[@johannesbakkedal1801]

Always enjoy watching you do speaker and transformer work

[@DavidTipton101]

Thank you Johannes 🙂

[@retro_tech]

Great job (as usual) repairing this electromagnetic speaker. Another reason why the field coil is less thick could be because your winding machine winds the coil so neatly, which is not strictly necessary for a field coil. The original one was probably wound much more unevenly.

[@DavidTipton101]

Thanks @retro_tech. The original coil was pretty well wound. It fell apart a bit when I dismantled it. 🙂

[@paulbennell3313]

Lovely job! And it'll sound even better when it's back in it's cabinet.

[@DavidTipton101]

Thank you Paul. It will 👍🙂

[@billnicholson2470]

A very good learning experience for you and us. Alot of thinking and patience. Thanks David. 73 de KB7ICI.....Bill

[@DavidTipton101]

Thank you Bill 👍🙂

[@stephenmalone1673]

Well done, Dave. You always leave me with a smile. Its rainy and cold here in North Florida. Merry Christmas.

[@DavidTipton101]

Thank you Stephen. Really, I can't imagine it being cold in Florida, I assume you mean it has plunged to the low 70s 😉 Merry Christmas.

[@jonka1]

Nicely done David. I wound one recently where the DC resistance was part of the screen voltage circuit for the whole radio and needed to be exact. That involved some trial and a few errors to arrive at the right amount of wire on the coil. Good to see you here.

[@DavidTipton101]

Hi Jonka, thanks. OK, interesting. I think I concentrated too much on the DC resistance and neglected the inductance 🤔🙂

[@jimburns348]

Great job Dave. Never sweat the small stuff. 😉

[@DavidTipton101]

Thanks Jim🙂

[@Antony_Jenner]

Thank you YT for not showing me this a week ago. Thanks for a great video Dave, Merry Christmass to you and your family.

[@DavidTipton101]

Hi Antony, make sure you have clicked the bell on the notifications icon on my channel. Thanks Antony, Merry Christmas to you and yours 🎄🙂

[@nzs316]

This speaker rebuilt had me hanging by a thread in anticipation. I never realized how intricate a speaker could be. To think that they were probably assembled manually! Happy Holidays from Canada!

[@DavidTipton101]

Hi Neil, thank you. All the best for Christmas and the New Year 🙂

[@clasicradiolover]

There you are. Hey, Mate. Another fine video, and I keep learning from you. I hope you are having a fine summer there down under.

[@DavidTipton101]

Thank you @clasicradiolover. It's hot and a bit of rain at the moment, I hope it's good weather at your place 🙂

[@clasicradiolover]

@DavidTipton101 I live in an area that gets down to 27° F then jumps back up to 70°F a few days or weeks later. It was below freezing last night and got warm enough for ac around 1:00.

[@RestoreOldRadios]

Dave, great job on the speaker! For me, every project provides a learning or relearning opportunity. Thanks again for the mention and Merry Christmas. All the best. Don

[@DavidTipton101]

Hi Don, thank you for providing such valuable information on field coils. It was a great help to me. I couldn't agree more Don, I still learn new tips, tricks and methods even doing things I have done for years. Merry Christmas and all the best for 2024 👍😊

[@rciancia]

Great job Dave.. The diameter of the coil is different because your winding method was more precise. WELL DONE !!

[@DavidTipton101]

Hi Ron, thanks. That's a good way to look at it 😄

[@rciancia]

@@DavidTipton101 we always turn lemons into lemonade !!! :) Great work as always

[@SBCBears]

I don't know what to say that hasn't already been said. Just, I'm awestruck.

[@DavidTipton101]

Thanks @SBCBears 🙂

[@fuzzwack1]

What a cool looking face on that radio!

[@DavidTipton101]

We did have some nice dials. Thanks Robert 🙂

[@BobAndersson]

Merry Christmas to you and yours Dave. Thanks for the entertainment and instruction. I hope 2024 is a happy and, above all, a healthy one for you. 🥂

[@DavidTipton101]

Thank you Bob. Merry Christmas and I hope a very happy and healthy 2024 👍🙂

[@richardmelville5973]

Sir, you are an absolute wizard.

[@DavidTipton101]

Thank you Richard 🙂

[@eddyaudio]

David a excellent refurbishment of old STC Electro Dynamic Speaker I admire the Winding Machine, In days gone by we used recycled speaker field coil with 240 Volt AC they made excellent demagnetised for tools around the workshop that come Magnetised,All the best for Christmas to you and yours,Ian.

[@DavidTipton101]

Thank you Ian. Field coils as demagnetising tools, nice 😀 Merry Christmas 🎄🙂

[@manFromPeterborough]

240V on field coil while playing audio would be hum city@@DavidTipton101

[@LarryDeSilva64]

You really outdid yourself on this one David. That coil winding machine is amazing once you get the tension right. You fine tuned that one done to the Gnats whisker. I have been watching Don at RestoreOldRadios for years and he really does great restoration work. I am 73 today and saw my oncologist cancer in full remission doesn't need to see me for 6 months. Have a Merry Christmas you and your family.

[@DavidTipton101]

Thank you Larry and congratulations on your oncologist report. It will be a happy Christmas for you. Agreed, Don is good to watch 👍🙂

[@maartenschapendonk6345]

Great job once more. Love the bit of ItaloDisco you put under the video

[@DavidTipton101]

Thanks Maarten. A bit of 70s disco never goes astray 😊

[@misterhat5823]

First off, I'd never have that kind of patience. It's amazing that you rewound that many turns of fine wire. As for matching the number of turns vs. resistance: Perhaps you could use thicker wire and match the number of turns. The resistance would come out low and if was more than, say, 10% low add a series resistor.

[@DavidTipton101]

Thanks Mr Hat. I did say thicker wire may have been a better choice 🤔

[@seankearney2592]

Bah Humbucker....Happy Christmas To You and all the Family, Have a Lovely Safe Christmas....

[@DavidTipton101]

Good one Sean 😄 Thank you and Merry Christmas and New Year to you 🎄🎅🎇

[@Plons0Nard]

Nice job Dave ! Not only the coilwinder was a good investment (thanks love ❤), also the 3d printer prooved to be a usefull tool. Inductance measurement would be the way to go but with a short in the original that is a no-go 🤓 That all said : well done 👍🏻🤝🏻🇳🇱

[@Plons0Nard]

And a lasercutter. You ! Spoiled kid 😂

[@DavidTipton101]

Thank you Nard. You gotta love the coil winder. I did wonder how to make the centring tool last time, wood turning, shims? I almost forgot about the 3D printer, very useful. Yes, inductance would have been good but with no real reference I couldn't use it. I have a lot to think about for next time 🙂

[@nigelbrockwell6237]

You learn something new every day. A really great job you've done with that speaker, well worth watching.

[@DavidTipton101]

Thank you Nigel 🙂

[@ronisch]

It's very cool see one good man work.

[@DavidTipton101]

Thank you Ronisch 😊

[@sheldonlatimer6688]

As usual David you're the best radio resteration person I know , you and your family have a very merry Christmas

[@DavidTipton101]

Thank you Sheldon. Merry Christmas and all the best for 2024 🎅🎇

[@mackfisher4487]

Incredible, give your wife a hug for allowing you to purchase your coil making machine. Dave your skills at restoring our incredible when you run into a problem you re-manufacture or come up with an incredible work around. No wonder Manuel uses your name as a description for good workmanship. P.S. Love your Christmas intro and other animations your cement cinematography skills are rivaling your cabinetry work.

[@DavidTipton101]

Haha.. she is a good egg Mack. I wasn't about to let a piece of wire get the better of me, although I was starting to wonder if it could be done 😄 Manuel has upped the bar a bit with cabinet work, considering his limited work area he does a terrific job. I drag out the Christmas intro each year, I have put it back in the drawer till next year. Thanks Mack.

[@lenhunter2719]

Thoroughly enjoyed that as always David, Merry Christmas And a wonderful new year to you and yours from me and mine here in darkest SouthAfrica. RWC winners 2023, still bloody dark without electricity though.

[@DavidTipton101]

Thank you Len. Congratulations winning the RWC but we prefer not to mention it here 😳 Your power problems have been going on for years, it appears it is improving from what I've read, let's hope so. Merry Christmas Len and all the best for 24 🎄🙂

[@kilcar]

Let me be one of the first to wish you a very happy and healthy New Year Dave to you and Yours! From Bend Oregon.

[@DavidTipton101]

Thanks Patrick. Happy New Year 😀

[@timothygrupp]

I've not seen a field coil on a speaker in months of Sundays. Very nice job on restoring it! Always nice to learn something in the process. Happy holidays!

[@DavidTipton101]

I should think it would be year of Sundays since these were used. Thanks Timothy. All the best for the holidays 🎄🎇

[@stanleycostello9610]

I was just thinking about you this evening. We haven't had a video from DRA for some time. And what do my wondering eyes appear? You guessed it. Well, you have and your family have a good Christmas and a Happy New Year.

[@DavidTipton101]

Thank you Stanley. A bit of a holiday and a bit of covid set me back. I should be back in full swing sometime in the new year. Merry Christmas and all the best for 2024 👍🙂

[@stanleycostello9610]

@@DavidTipton101 I knew that something was up. I wonder how, in the 1930's, how they did winding with such narrow wire? Do you have any idea?

[@DavidTipton101]

They had mechanical winding machines back then and much earlier than the 30s. They would wind that coil in a very short time I would imagine.

[@gerardcarson2779]

Wishing you and yours a very happy Christmas, and all the nest for the New Year. Great bit of "microsurgery" on the speaker, always fiddly to do. And am always impressed with that coil winding machine of yours. Great work, and always enjoyable to watch. Gerry

[@DavidTipton101]

Hello Gerry, thank you, Merry Christmas and a great 2024 for your and yours. The winder is great fun to use but a little frustrating at times 😄 Cheers!

[@techobaz55]

Top job Dave, so interesting about these types of speakers. Thank You ! Cheers, Baz

[@DavidTipton101]

Thanks Bas 😊

[@Radiocruncher]

That was a lot of work David. The winding machine is amazing especially with your modifications. It must have taken a while to master. Great job on the speaker and thanks for the explanation of how it works. Merry Christmas and a Happy New Year

[@DavidTipton101]

Hi Graham. Thank you. The winder is pretty easy to program, I was surprised I remembered how to do it 😄 Thanks Graham, Merry Christmas to you and wishing you and family a fantastic 2024 🙂

[@DIlic-iz9tx]

_What you are doing is perfection._

[@DavidTipton101]

Thank you Domenico 🙂

[@ChrisSwenson]

I wish that I had a mind like yours David, that can wrap around the complexities of these schematics and various components. My dad was an engineer and foreman of the Model shop for Remington Rand Univac from the late 50's til retiring in 1985. I guess I inherited more from my mom's artistic temperament. Fantastic Job! (Not surprised). Merry Christmas & Happy New Year! - Chris

[@DavidTipton101]

Hello Chris, we all have our strengths, I wish I had a artistic strength but I have none and I fail miserably as an academic. Thank you Chris, Merry Christmas and all the best for 2024 🙂

[@JerryEricsson]

Once again, I am amazed at the restoration power that exists between your ears! The attention to detail is wonderful, you would have went far in the military with your super powers. I would have looked at that speaker and tried to come up with a way to get rid of it and replace it with a permeant magnet speaker, the thought of trying to rewind such fine wire would have put a stop to my attempts even if I did have your massive number of tools at hand. Thanks for the wonderful video and Merry Christmas to you and yours. I guess mine will be a bit baren this year, my son and his family can't make the trip this year so we aren't even putting up the tree no grand kids, no Christmas and I shall miss them, I haven't seen them or my great grandson now since last Christmas. Getting old sucks.

[@DavidTipton101]

Thank you Jerry. Replacing the speaker would be harder than a rewind and It was good that it could be saved. Sorry you will have a quiet Christmas this year Jerry. I hope you can at least talk to your family on Facetime or zoom. Merry Christmas 🎄

[@mikecass8306]

Dynamic repair !! thanks Dave 😀

[@DavidTipton101]

Thanks Mike 🙂

[@magcoco]

Amazing work David. I always wanted to understand how those speakers work. 😊

[@DavidTipton101]

Hello Khaled, thank you. Pretty simple when you lay it out 🙂

[@stuartirwin3779]

Hi Dave. The difference in measured coil resistance on the original coil from the specified resistance can easily be accounted for by temperature. I believe the resistance was specified at 20 deg, and only about 5 degrees above that can add 50 ohms. It's worth considering that, when measuring copper wire. ☺

[@DavidTipton101]

Hi Stuart, I understand what you were saying the other day now. I had the AC on in my room so it should have been about 23C. That's a good point, I will remember that for next time. Thanks Stuart 👍😊

[@domtrimboli6238]

Hi David, awesome work, you are a genius, keep up the excellent work. Cheers.

[@DavidTipton101]

Thank you Dom 👍🙂

[@haraldlonn898]

Thanks for a great video. I learned a lot from it.

[@DavidTipton101]

My pleasure Harald, thank you 🙂

[@juliangerardcascio1111]

😊 Good Job Dave Tipton 👏 👍 +1 !!

[@DavidTipton101]

Thank you Julian 🙂

[@craignehring]

Fantastic repair Dave get it done

[@DavidTipton101]

Thank you Craig 👍🙂

[@johnhandley6406]

Thanks for the video Dave, have a great Chritmas, from John in Walmer, UK (although not as warm as you atm)

[@DavidTipton101]

Thanks John in Walmer. At least you are in the warmer part of the UK. Merry Christmas 🎄🙂

[@nathkrupa3463]

Great work sir.😊 Sir you installation a new speaker coil you must adjust the coil on magnet shaft otherwise speaker not properly work. Thanks thanks sir 😊❤❤

[@DavidTipton101]

Thanks Nath 👍🙂

[@ninaevans4501]

Well, G'day Dave and Family, Wishing You All A Happy New Year! Looking forward to more fantastic vids (and your usual humour as always)! By the way, the Windies thrashed England at cricket. No more than we deserve! 👍😊 Support for your channel as always. Wayne & Nina. 👍👍👍👍👍👍👍👍🇦🇺🇦🇺🇦🇺🇦🇺🇦🇺🦘🦘🦘🦘🦘

[@DavidTipton101]

G'day Nina and Wayne. Happy New Year to you both. We look to be in a good position against Pakistan 👍🙂

[@ninaevans4501]

G'day David and family. Happy and Prosperous New Year to you all too 👍👍❤️❤️ Yeah, I think Australia will give Pakistan a run for their money, that's for sure. Far better than OUR miserable performance against the Windies. A bloody lack lustre event to say the least. Not on, not bloody on at all 😒😒 ❤️❤️❤️❤️❤️👍👍👍👍🇦🇺🇦🇺🇦🇺🦘🦘🦘🇬🇧🇬🇧🇬🇧🫖🫖🫖😊😊😊😊😊😊😊😊😊

[@DavidTipton101]

There's always tomorrow for the Poms. We beat Pakistan 🏏🙂

[@neilforbes416]

3:34 - Humbuck! "Here's a dance you should know! Baby when the lights are down low!...... Oh, sorry, that's "Hucklebuck"! LOL😁

[@DavidTipton101]

😀

[@Mediawatcher2023]

@neilforbes416 Careful or you be finding yourself running all the way home that's the B side of the Brendan Bowyers version which was a double A sided hit.

[@neilforbes416]

@@Mediawatcher2023 ~ groan ~

[@Mediawatcher2023]

@@neilforbes416 The A side got all the airplay of course.

[@stevejagger8602]

I had my first experience with field coil speakers in a 1954 Gretsch guitar amplifier. I too had to do a lot of hunting on various forums to find the circuit drawing you used. A novel and interesting approach to B+ filtering combined with speaker magnetisation. Nice work.

[@DavidTipton101]

Thank you Steve. For some reason they often didn't include the speaker wiring, not a big deal but adds to the confusion 🙄

[@stevejagger8602]

@@DavidTipton101 it certainly confused me on first viewing!

[@mrb.5610]

Another excellent video, David ! And just a thought - but whenever I have to measure something on old machinery, whatever, I find it's usually easier to stick to imperial measurements and not switch to metric - they usually round up to inches or fractions thereof anyway - 8ths or 16ths more often than not. Anyway - another very enjoyable video - looking forward to more from you next year - and I hope you and the missus have a good Christmas !

[@DavidTipton101]

Thanks Mr B. I agree... to a point. The wire is supplied in metric so I measured it in metric. You are right, when this speaker was made it would have been measured in imperial and rounded as such which works well for drill sizes etc. As we are a metric country and everything I use is metric, software and machines for example, it is hard to swap and change all the time. If I need to drill a hole for an old bolt I will use imperial drills and measurements. Thanks Mr B, Merry Christmas to you 🎄

[@chriskilby5300]

hope you have a great Christmas Dave. Hope to see more great videos in 2024. take care.

[@DavidTipton101]

Thanks Chris. Merry Christmas to you and yours 🎄😀

[@jeffreyhickman3871]

Sorry 😞 I missed your video. That’s a very inviting Christmas 🎅 tune. I can already tell that you’re working on a field coil speaker 🔊. The field coil must have burned 🔥 open. There’s also humbuckers on electric ⚡️ guitars 🎸, if ya knew. Inside of one ☝️ is a permanent magnet 🧲. I’m working if this radio 📻 works on the same principle. Merry Christmas 🎄🎁 🎅 🤶 and a very Happy 😊 and safe New Year. Your friend, Jeff.

[@DavidTipton101]

Hi Jeff. The field coil had shorted out and required a rewind. The humbucker in a guitar uses the same principle. Merry Christmas Jeff and all the best for 2024 🙂

[@glasslinger]

Nice winding machine. I'm surprised there is no soft start or wire tensioner. A tip (from an old radio restorer) is the actual resistance of the coil is not important at all. I hand feed the wire and pile it on until the form is full, not paying any attention at all to the resistance. It's amp-turns that count, and even that is very lax in requirements. The overall resistance should be lower if anything so you don't drop your B+ to the circuit too much. After you do a few dozen coil rewinds you will figure ways to cut the time and labor. You did a very nice job on it but you will not make a profit if you keep that level of labor. I had to do at least one radio per day when I was in business, and two a day was normal.

[@DavidTipton101]

Hi glasslinger, thank you for dropping in. The machine has a slow start, it was set to the lowest value but a real soft start would be better. I was at a loss as how to approach this. I had originally thought the wire resistance would be the same as the old wire, it wasn't. I couldn't wind it until it was the same size as the original or the DC resistance would be close to double and would drop the B+ too much. In future I will better understand this and make allowances before I wind the coil and maybe match the wire resistance rather than the diameter. If I worked in a repair shop the business would go under in a few days 😄 Thanks glasslinger.

[@KevinCoop1]

I had to rewire a 1963 Sears electric guitar Hershey bar pickup. Nobody could rewind it for me since there were no holes in the bar. So, I used my Shopsmith and mounted the bar to a piece of wood that I turned smooth. I mounted have of a magnetic door switch to the back of the wood and fixed the other half so it would close by the magnetic. I wired the switch to the circuit board of an old desktop calculator at the + button. Those old calculators would work as 1+++++++++++=13. With the 42 awg wire, it was hard to do, because of instant start breaking the wire. Don’t remember how many thousand wraps it needed.

[@DavidTipton101]

I had to look up Hershey bar pickup and Shopsmith 😄 There is a lot of fine wire in there. That's thinking outside the box using the calculator, well done 👍👏🙂