UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Improving Selectivity In Vintage Receivers

Jon_G4MDC · 3rd Jan 2023, 2:07 pm

Been thinking on adding a link winding to the HRO Mixer Anode Coil assy.

The universal law of $^d says that the tuned winding is up against the end cheek. To add an extra winding is only possible alongside the untuned Anode coil and that is not the one that I want best coupling with.

Has anyone experimented with moving the coil pies further along the former? I would like to create about a 1/8" gap where the new winding could be wound in a slot. I wonder what dope sticks the coils to the former and what might dissolve that without also attacking the former material?

3rd Jan 2023, 2:07 pm	#108
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Improving Selectivity In Vintage Receivers Been thinking on adding a link winding to the HRO Mixer Anode Coil assy. The universal law of $^d says that the tuned winding is up against the end cheek. To add an extra winding is only possible alongside the untuned Anode coil and that is not the one that I want best coupling with. Has anyone experimented with moving the coil pies further along the former? I would like to create about a 1/8" gap where the new winding could be wound in a slot. I wonder what dope sticks the coils to the former and what might dissolve that without also attacking the former material? Attached Thumbnails Last edited by Jon_G4MDC; 3rd Jan 2023 at 2:13 pm.