30 minute plug in coil former - UK Vintage Radio Repair and Restoration Discussion Forum

g3yuh_ron · 16th Jan 2009, 2:56 pm

This project is how I make my plug in coil formers for my valve projects

http://g3yuh.radiotelegraphy.net/plu...plugincoil.htm

paulsherwin · 16th Jan 2009, 3:04 pm

Some excellent tips there. The idea of making a plug from an old socket by fabricating some pins is particularly good - B8A plugs are almost impossible to find when trying to make valve adapters for something like a UL41.

Paul

OErjan_S · 16th Jan 2009, 5:22 pm

look here, third image from bottom of page.
http://www.peeblesoriginals.com/radio-parts.html
and here is a quick help to calculate coil data for single layer coils.
http://www.crystalradio.net/professo...coylecyl.shtml

to get it exact you need to know roughly how long the coil will become, if you use 0.5mm wire (I tend to do that) it is merely half number of turns. if you use 40#48 litz (for BCB and 160m) you wind 10 turns measure and use that number,

g3yuh_ron · 16th Jan 2009, 6:17 pm

I have just updated the page to include a modification by someone using D plug pins that cuts the contruction time down to 15 minutes

I do like that coil turn calculator Excellent!!!!!

Mike-repairman · 16th Jan 2009, 6:36 pm

Excellent Ron.

By the way I used a B9G base the wrong way round and inserted pins to make an adapter for the AVO valve tester. Hadn't though of pins from an old D plug though; excellent idea.

Mike.

16th Jan 2009, 2:56 pm	#1
g3yuh_ron Retired Dormant Member Join Date: Jan 2009 Location: Margate Posts: 19	30 minute plug in coil former This project is how I make my plug in coil formers for my valve projects http://g3yuh.radiotelegraphy.net/plu...plugincoil.htm

16th Jan 2009, 3:04 pm	#2
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,970	Re: 30 minute plug in coil former Some excellent tips there. The idea of making a plug from an old socket by fabricating some pins is particularly good - B8A plugs are almost impossible to find when trying to make valve adapters for something like a UL41. Paul

16th Jan 2009, 5:22 pm	#3
OErjan_S Retired Dormant Member Join Date: Mar 2007 Location: Skelleftea, Sweden Posts: 250	Re: 30 minute plug in coil former look here, third image from bottom of page. http://www.peeblesoriginals.com/radio-parts.html and here is a quick help to calculate coil data for single layer coils. http://www.crystalradio.net/professo...coylecyl.shtml to get it exact you need to know roughly how long the coil will become, if you use 0.5mm wire (I tend to do that) it is merely half number of turns. if you use 40#48 litz (for BCB and 160m) you wind 10 turns measure and use that number, Last edited by OErjan_S; 16th Jan 2009 at 5:35 pm.

16th Jan 2009, 6:36 pm	#5
Mike-repairman Heptode Join Date: Jun 2008 Location: Cambridgeshire, UK. Posts: 613	Re: 30 minute plug in coil former Excellent Ron. By the way I used a B9G base the wrong way round and inserted pins to make an adapter for the AVO valve tester. Hadn't though of pins from an old D plug though; excellent idea. Mike.

16th Jan 2009, 6:17 pm	#4
g3yuh_ron Retired Dormant Member Join Date: Jan 2009 Location: Margate Posts: 19	Re: 30 minute plug in coil former I have just updated the page to include a modification by someone using D plug pins that cuts the contruction time down to 15 minutes I do like that coil turn calculator Excellent!!!!!