Simplex Model PB | Loudspeaker Rebuild Attempt

Looks like a Piezo Electric Loudspeaker stamped LX21 and 26021 from the early 1930s, but it's not.
Thanks to Scott's reply below & others to my earlier video.
It's not a piezo, it's a moving iron electrodynamic. The package at the back has two soft iron horseshoe magnets which create the magnetic field for the motor. There will be a coil of wire wrapped around a springy, soft iron armature, and this moves when audio is fed into the speaker from the output tube. This coil is connected between the power supply (the + terminal on the speaker) and the plate of the output tube (the P terminal on the speaker). There is no output transformer. The levers you refer to magnify the small movements of the armature to more efficiently drive the cone.
In addition, check out my earlier video and others where I introduce the Simplex, model PB mini-cathedral dual-band receiver I acquired about nine years back that's been in storage. The seller at the time told me the radio was from a family in the Charleston, SC area; other than that, I don't have any other information on the history of the receiver with the exception of the Simplex factory was located in Philadelphia, PA then later moved to Sandusky, OH where the company was purchased by Philco and the plant was closed shortly after.
The playlist for the Simplex Model PB restoration:
• Simplex Model PB | Res...
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#restoreoldradios
#Simplex

[@saturn5tony]

Wow, i am so amazed. To see this speaker given a new life! Amazing just amazing 😮

[@RestoreOldRadios]

Thank you Tony; sounds fairly good for the LS technology for that period of time. I appreciate you watching. Best, Don

[@cjay2]

Wow. Well done, again, Don. Looks and sounds great.

[@RestoreOldRadios]

CJ - much appreciated! All the best. Don

[@AllAmericanFiveRadio]

Nice job Don. Now the radio sounds as it did when it was new.

[@RestoreOldRadios]

Thank you Rick. It was rewarding to hear it play again. Now it’s time to recap it, etc. Thanks again. Best, Don

[@sgath92]

Amazing! This kind of repair would heavily intimidate me.

[@RestoreOldRadios]

Appreciate you watching and reaching out. Best, Don

[@ScottGrammer]

Thanks for the shoutout, and nice work repairing the speaker!

[@RestoreOldRadios]

Scott - thank you again for taking time to reply and for sharing your knowledge. Not the best sounding loudspeaker, but probably expected based on the era and design for this period. Best, Don

[@terryblackman6217]

What can i say that has not all ready been said. It's a credit to your skills.

[@RestoreOldRadios]

Terry - thank you. I was surprised it sounds so well based on the technology for that period. I started recapping and replacing resistors today; fun stuff. Best, Don

[@TheRadioShop]

Beautiful repair Don!

[@RestoreOldRadios]

Thanks Buddy. Hope you’re doing well. Best, Don

[@hestheMaster]

Impressive cone replacement Don!

[@RestoreOldRadios]

Thank you Steve. It was rewarding to hear it sing again for sure. Best, Don

[@Wil_Bloodworth]

Excellent job Don! I am fixing a destroyed speaker myself by following your designs... but you make it look too easy!

[@RestoreOldRadios]

William, you can do it. Do overs are common for me at times. Just stay the course and I know you’ll be successful. Best, Don

[@Wil_Bloodworth]

Thank you Don. I just finished the speaker and boy is it ugly! However, it seems to work well and it is going back into the radio in the next few days. Thanks again for your guidance!@@RestoreOldRadios

[@RestoreOldRadios]

@@Wil_Bloodworth William - I’ve done many myself that look rough, but perform pretty well. Thanks again for sharing your results and all the best going forward. Don

[@jimnewman5596]

Don, you make it look easier than it is.

[@RestoreOldRadios]

Appreciate it Jim. It only took a little over 5 minutes to complete. LOL Best, Don

[@aa1ww]

Don, you always get them sounding some great. Hope you get to hear good Christmas music on it.

[@RestoreOldRadios]

Much appreciated! It sounds pretty good considering the technology for that period. When I get the recapping complete, I’ll look for some copyright free Christmas music to play. Best, Don

[@W1RMD]

Looks great! Thanks Don and take care.

[@RestoreOldRadios]

Thank you. It was rewarding to hear it play again. All the best. Don

[@tectalabyss]

Hi Don. When I read attempt I had to grin, has I knew you would fix it. : ) As always I liked and shared. All my very best.

[@RestoreOldRadios]

Much appreciated Bobby. I appreciate you watching my friend. Best, Don

[@lawrencehalpin6611]

Nice job. thank you for the information and guidance. Kind regards.

[@RestoreOldRadios]

Glad it was helpful! All the best. Don

[@HD7100]

Very well done!

[@RestoreOldRadios]

Thank you very much! Best, Don

[@greggsvintageworkshop8974]

Nice job Don! I have a speaker I'm making a cone for currently, so hopefully mine will work as well.

[@RestoreOldRadios]

Gregg - I know you’ll be successful and look forward to seeing your M&P. Best, Don

[@TV-js5zg]

잘 하셨습니다....

[@RestoreOldRadios]

Much appreciated. All the best. Don

[@DERB_Seymour_Indiana]

Great job on this Don. :)

[@RestoreOldRadios]

Thank you kindly Doug. Best, Don

[@larrypozzi2201]

You’re a master

[@RestoreOldRadios]

I appreciate your kind words Larry. All the best. Don

[@kenf8563]

I knew you could repair this speaker as per your previous video, a lot easier to do than an actual voice coil type. Don, I think you just sharpened your scissors by cutting the Scotch-Brite pad.

[@RestoreOldRadios]

Scissors have been resharpened LOL. It sounds fairly good considering… I appreciate you watching and reaching out Ken. Best, Don

[@jimburns348]

❤Nice!👍

[@RestoreOldRadios]

Thanks! 😄 Best, Don

[@ericschulze5641]

What kind of paper is yhe cone , construction paper ?

[@RestoreOldRadios]

Check out the video description of my earlier video below, which provides that information and more. Thanks for watching and reaching out. Best, Don kzbin.info/www/bejne/ep6lnZynedyHr7ssi=P83EXyy-pSOD-oyl

[@aa1ww]

Don, I came back to this video as I have a couple of speakers that will need patching or reconing. Just refer me to your other videos if necessary ... Where does one get the surround? What material did you use for making the cone? If the surround is not affected should one replace it anyway or just replace the cone?

[@RestoreOldRadios]

I bought some 6” cones off eBay years ago and and cut the foam surround out and have used them in addition to a few other surrounds I bought off eBay and from Amazon. The Speaker Exchange is another resource as well that I have used at: reconingspeakers.com Check my video and the video description for the cone material that I’ve used at: kzbin.info/www/bejne/ep6lnZynedyHr7ssi=w4lOTQVKFo2AL81E Regarding the surround, I try to reuse the original surround when possible, but the majority of the old speakers I’ve encountered are severely degraded, so it really depends. Hope this helps. Best, Don

[@aa1ww]

Thank you for your detailed and super helpful reply!

[@OIE82]

Ok Mr Don. I guess everyone else knows about that type of speaker but I have never seen one. Who made it? Do you have another one to show how it works? And nice repair btw. Thanks.

[@RestoreOldRadios]

Check out 58-R, page 15 at: www.worldradiohistory.com/Archive-Courses/Radio_TV-Training_School-1949.htm Merry Christmas and Happy Holidays. Best, Don

[@RestoreOldRadios]

Utah Radio Products out of Chicago is my best guess on the manufacturer, but I never could find an exact match. Best, Don

[@OIE82]

@@RestoreOldRadios Thank you for the reply and the link to the theory of operation. That design is a little weird and more complicated than other speaker designs but at least now I understand it better. If I ever run into one, I will be better equipped. The next radio on my bench will be a Zenith G511 that belonged to my wife's great-grandmother. Because of the sentimental connection, there is a little more motivation to get it repaired and restored. Thank you for all your helpful videos. Luther

[@RestoreOldRadios]

@@OIE82 Luther, you’re welcome. Hope things go as planned on the Zenith; that’s a beautiful radio and the memories are priceless. Happy New Year.

[@bobkozlarekwa2sqq59]

Great job, but why no narration?

[@RestoreOldRadios]

Bob, just not feeling my best when I was doing the work and decided to forgo any narrations. Thanks for watching and reaching out. Best, Don

[@TV-js5zg]

요즘은 그나마 스피커 엣지를 판매 하므로 수리가 수월 합니다...

[@RestoreOldRadios]

Definitely much easier these days with the availability of.. Best, Don