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Old 4th Dec 2016, 9:02 pm   #1
peter.sables
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Default All World two help.

hi

I'm about to put the parts together to build the All WORLD TWO. Only I need help with the coil for it. Dia - turns swg.

please help.

Pete G4MRU

hI Again.

I've been looking at the information on here.. Good but nothing about the coils...

pete

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Old 4th Dec 2016, 10:57 pm   #2
David G4EBT
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Default Re: All World two help.

There's a 73-page paper by Gerry O'Hara at the Eddystone User Goup on the 'All World Two' at the link below Peter, but originally the coils were off-the-shelf Eddystones, so unless you can find the data about those coils, that's not a lot of help. Undoubtably others will have built replicas, so if no-one on here can add anything, you might like to try your luck on the EUG:

http://eddystoneusergroup.org.uk/Res...Appendices.pdf

Hope that helps a bit.

Good luck in your quest.
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Old 4th Dec 2016, 11:21 pm   #3
ms660
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Default Re: All World two help.

Some info here for some coil turns, no diameter given as far as I can see but should be able to work out/guesstimate ?:

http://www.vintageradio.me.uk/kits/eddy_allwave.htm

Lawrence.
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Old 5th Dec 2016, 12:07 am   #4
peter.sables
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Default Re: All World two help.

hi.

thats good. I can make a start with that.

pete G4MRU
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Old 5th Dec 2016, 12:00 pm   #5
60 oldjohn
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Default Re: All World two help.

Hi Pete, I have this 1.5" D coil, Looks like its the same former on the above Eddystone page with 6 pins, marked "RAYMART MFC CO BIRMINGHAM" Box is marked looks like "281L coil for radio" or may be price 28/4 but that would be very expensive for the year. Yours for postage if needed.

John.
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Old 5th Dec 2016, 5:21 pm   #6
peter.sables
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Default Re: All World two help.

HI.

Yes please. That's brilliant

Pete G4MRU
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Old 26th Dec 2016, 9:58 pm   #7
JohnBG8JMB
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Default Re: All World two help.

Hi Pete
Dia is 1 3/8"
all the info can be found on http://www.eddystoneusergroup.org.uk/
I've attached a pic of the data, I hope

I need a 10x14 pf step bandspread tuning cap 'tank unit 1042' for a similar project [amateurs SW2][

Cheers
John
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Old 12th Mar 2017, 5:21 pm   #8
VE3AWA Lou
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Default Re: All World two help.

Hello Pete,

Are you using Eddystone formers and did you find the turns count information you needed?

73, Lou VE3AWA
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Old 13th Mar 2017, 12:33 am   #9
Bazz4CQJ
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Default Re: All World two help.

I wonder which is better; an "All World Two" or an "International Shortwave Two" (for latter see http://vintageradio.me.uk/radconnav/2_valve.htm) ?

Perhaps we should ask Harry Hill?

Some similarity of coils?

B
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Old 24th Mar 2017, 10:30 pm   #10
peter.sables
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Default Re: All World two help.

hi.

I have finished the All World Two. People keep asking is it any good. I must say I've built better. Its all down to getting used to the band spread. In mine I used a modern tuning capacitor. Trouble is the are not linear, so the band spread is not linear. not good.

Pete
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Old 25th Mar 2017, 9:25 am   #11
Bazz4CQJ
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Default Re: All World two help.

Given the limited degree of selectivity of a two valve TRF, and if you have some decent slow-motion drives, I'm a little surprised that you need bandspread, at least for broadcast stations. The "Int. SW 2" didn't have bandspread. Perhaps those Eddytone formers really do make super Hi-Q coils .

B
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Old 25th Mar 2017, 10:03 am   #12
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Default Re: All World two help.

Quote:
Originally Posted by peter.sables View Post
Its all down to getting used to the band spread. In mine I used a modern tuning capacitor. Trouble is the are not linear, so the band spread is not linear. not good.
What's the value of the bandspread capacitor you used?

Lawrence.
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Old 25th Mar 2017, 10:48 am   #13
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Default Re: All World two help.

Here's a good article on regens from 1933:

http://www.rfcafe.com/references/qst...y-1933-qst.htm

Lawrence.
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Old 27th Mar 2017, 10:50 pm   #14
peter.sables
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Default Re: All World two help.

hi

That is the problem. Ha the band spread is 25pf.

pete
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