UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Ed_Dinning · 2nd Dec 2021, 10:15 am

Hi Folks, It is wound on an EI 48 core so just under 2" long.

For use on a live chassis set it should be designed to give the correct creepage and clearance, so would be on a double section bobbin. It should also be certified as meeting CE standards. This would slightly reduce the coupling between the windings.

In theory it would boost the signal bt a factor of 4, but due to loading effects it could be a bit less. I have used it with a switch to prevent it loading the radio signal when in use.
I've also added a 0.1 uF cap as a DC blocker to prevent it altering the bias on the OP valve which it may do in some circuits.

Ed

2nd Dec 2021, 10:15 am	#5
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: Saving sets from butchery Hi Folks, It is wound on an EI 48 core so just under 2" long. For use on a live chassis set it should be designed to give the correct creepage and clearance, so would be on a double section bobbin. It should also be certified as meeting CE standards. This would slightly reduce the coupling between the windings. In theory it would boost the signal bt a factor of 4, but due to loading effects it could be a bit less. I have used it with a switch to prevent it loading the radio signal when in use. I've also added a 0.1 uF cap as a DC blocker to prevent it altering the bias on the OP valve which it may do in some circuits. Ed