08-01-2013, 06:21 PM
The article in question may be seen here: http://www.renovatedradios.com/articlePages/Winder2.pdf and http://www.renovatedradios.com/articlePages/Winder1.pdf
- Joe
- Joe
1936 Ekco AC77
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08-01-2013, 06:21 PM
The article in question may be seen here: http://www.renovatedradios.com/articlePages/Winder2.pdf and http://www.renovatedradios.com/articlePages/Winder1.pdf
- Joe
08-01-2013, 07:03 PM
(This post was last modified: 08-01-2013, 08:46 PM by Radio Fixer.)
Thanks Joe.
Just wanted to say David if you have never done a complete radio strip, a true basket case, thats a different issue. Its good, and passes the winter pretty well, so go for it. All part of the learning curve. Me? I've done more than I have written articles on and there's a few of those about, and if they aint anything special, or I didnt come up with a new trick or a twist on an old one, to me now (not years ago to be true) whats the point in writing about them? But I guess you wont be doing an article on it ... Ekco waxies restuff pretty good. If any of the transfomers are O/C dont let that put you off ... delam and rewind. Scramble works for fields and just about everything other than RF (and you can even get around that that without a proper wave winder but I understand you have one). cheers Gary
08-01-2013, 08:57 PM
Good article on the coil winder Gary, thanks.
Lawrence.
08-01-2013, 09:34 PM
I'd second that! It was written before I became a member of BVWS so I'd not seen the two bulletins in which the two articles appeared. Excellent Gary - I'll be off on a frolic now itching to make a winder along similar lines - at least, I'll add it to my 'do list'!! I had thought about using a battery powered screwdriver, but they do have the slight drawback of being single speed rather than the variable elctronic speed of a battery powered drill, so I might canibalise a drill instead.
I'l have to check the gauge of the wire on the AC77 field coil - the thicker the better! I may have thicker than 46 SWG (say 42 SWG) if I poke around among my 'souvenirs'. Thanks for posting the article Joe.
Regards, David.
BVWS Member. G-QRP Club Member 1339. 'I'm in my own little world, but I'm happy, and they know me here'
09-01-2013, 08:25 AM
(This post was last modified: 09-01-2013, 08:47 AM by Radio Fixer.)
Thanks for the thanks on the article. Of course anyone making one now would probaly use a mechanical or calculator counter, that seems a brilliant idea to me. One chap in the US did correspond with me and built one himself. It was actually described on the Antique Radio Forum and should be still on their site. It was rewarding that someone found the idea useful. As I remember his was a nicer build mechanically and he got the motor as a spare from a hardware chain for a few dollars.
42 swg will still be too fine David. But anyway beware of old wire. Its usually kicked around for years (say 50) and the outer layers are likely to be damaged. You would be wise to take off the first 2 to 3mm or so and dump that. But another thing is the insulation is not as good as modern stuff. Today modern wire is rated at a 1000V and it will certainly stand that. I tried two strands tight twisted and it did. One strand twisted with a piece of bare copper wire and there were some sparks. But of course that is how enamelling works in needing two layers ... one may have a tiny imperfection but in use it is unlikely to align with a similar imperfection. For me winding isnt a quick thing; takes quite a few hours so I would only use new wire. To do it and get a failure is not a risk I would take. Gary
09-01-2013, 08:37 AM
Oh! another strange thing is you may find the speaker voice coil open. Oddly Ekco sometimes wound with aliminuim wire, why I cant imagine as the sets were never HiFi and needing the fastest cone in the west. This was the case with my AC97 where the wire had corroded.
I got around it by slicing off the voice coil complete with tube and attacing one, with copper wire, from a later speaker. Still working fine. Gary
09-01-2013, 08:51 AM
(This post was last modified: 09-01-2013, 08:53 AM by Radio Fixer.)
09-01-2013, 09:41 AM
(09-01-2013, 08:51 AM)Radio Fixer Wrote: Is this AD65 basket case enough for you? Ooooh! A challenge - looks fun! The variable capacitor looks in decent nick and that's the main pain - everything else is replaceable/restuffable/rewindable/reconditionable (and probably various other "....ables" )
sıʌǝɹq ɐʇıʌ `ɐƃuol sɹɐ
ʞɔıu
09-01-2013, 01:01 PM
(This post was last modified: 09-01-2013, 01:12 PM by Radio Fixer.)
Actually Nick the tuning gang was equally rough once off but it disassembled ... first I've gone that far.
Pretty sure the first pic was after the dishwasher (thats what the notes say) and the second is before. After a week sitting on the boiler to get some insulation back in the Paxolin, it falls to a 100K at 1V, it was dropped in a jar of thin Jenolite, dried and masked off before spraying with Smoothrite Gary
09-01-2013, 01:12 PM
Strewth Gary, apart from it's dilapidated condition, the under-chassis layout of that AD65 is a real rat's nest! What a contrast with the cleverly though out chassis on the A22, which I think is the best of the bunch of the round Ekcos. Thanks for pointing me to your BVWS Bulletin article in Winter 2008 of the total stri-down and refurbishment of an Ekco AC97 (AKA 'Cyclops and 'Robot') - a much more stylish and sought after set than the A77, but sharing many similarities and posing similar problems to the AC77. The article will prove invaluable to me if I do go ahead.
Thanks for your cautionary tips about wire gauges, coatings, and likley condition of old stock.
Regards, David.
BVWS Member. G-QRP Club Member 1339. 'I'm in my own little world, but I'm happy, and they know me here' |
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