Emor Globe coil repair - UK Vintage Radio Repair and Restoration Discussion Forum

newlite4 · 29th Nov 2020, 11:47 am

I have a broken oscillator coil on this set, I believe that this is the LW oscillator coil but I stand to be corrected owing to the absence of a schematic. I have unwound two 10 foot lengths of enamelled copper wire to get down to the break and now measure around 100 ohms. I had planned to use the "knot and solder" technique to join the two broken lengths back onto the coil, but feel it is probably better to just re-solder the remaining coil end to the lug and take up any losses with the on-board trimmer as this would avoid any further trauma to the coil. The attached images show the damaged coil before unwinding. Being near the edge, this coil is vulnerable since the top half of the globe can slide off and knock against it. Would this repair be OK?
Neil

FStephenMasek · 30th Nov 2020, 7:24 pm

Do you have a meter which can measure inductance? Do you have a meter to measure capacitance? If so you can determine if the combination will work. Of course, you can also just put it together and try it.

newlite4 · 30th Nov 2020, 10:12 pm

Hello Steven, I have gone for the knot and solder technique so have rebuilt the coil to near design spec, I also noticed that the MW coil had some damage though not so severe but both the outer and inner layers needed rewiring.
I have just done two Tesla Talismans, both of them also had damaged coils that needed repair. It seems almost as if the amateur bodger gets in there and carelessly mashes up the RF section then gives up on the set not realising the damage done to very delicate parts - "keep 'em out" I say.
Hopefully when it is all reassembled things should show signs of improvement.
Neil

29th Nov 2020, 11:47 am	#1
newlite4 Octode Join Date: Nov 2003 Location: Bath, Somerset, UK. Posts: 1,805	Emor Globe coil repair I have a broken oscillator coil on this set, I believe that this is the LW oscillator coil but I stand to be corrected owing to the absence of a schematic. I have unwound two 10 foot lengths of enamelled copper wire to get down to the break and now measure around 100 ohms. I had planned to use the "knot and solder" technique to join the two broken lengths back onto the coil, but feel it is probably better to just re-solder the remaining coil end to the lug and take up any losses with the on-board trimmer as this would avoid any further trauma to the coil. The attached images show the damaged coil before unwinding. Being near the edge, this coil is vulnerable since the top half of the globe can slide off and knock against it. Would this repair be OK? Neil Attached Thumbnails __________________ preserving the recent past, for the distant future.

30th Nov 2020, 7:24 pm	#2
FStephenMasek Pentode Join Date: Jul 2011 Location: Mission Viejo, California, USA Posts: 144	Re: Emor Globe coil repair Do you have a meter which can measure inductance? Do you have a meter to measure capacitance? If so you can determine if the combination will work. Of course, you can also just put it together and try it.

30th Nov 2020, 10:12 pm	#3
newlite4 Octode Join Date: Nov 2003 Location: Bath, Somerset, UK. Posts: 1,805	Re: Emor Globe coil repair Hello Steven, I have gone for the knot and solder technique so have rebuilt the coil to near design spec, I also noticed that the MW coil had some damage though not so severe but both the outer and inner layers needed rewiring. I have just done two Tesla Talismans, both of them also had damaged coils that needed repair. It seems almost as if the amateur bodger gets in there and carelessly mashes up the RF section then gives up on the set not realising the damage done to very delicate parts - "keep 'em out" I say. Hopefully when it is all reassembled things should show signs of improvement. Neil __________________ preserving the recent past, for the distant future.