UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Building the 'Minimod' AM modulator-questions!

Restoration73 · 28th Sep 2018, 7:16 pm

There are two possible cures to reduce drift.
1- replace the 10K inductors with 10EZ types, RWO6A6408 (red core) tunes MW.
2- I am not sure what type of parallel capacitor has been used, polystyrene or silver mica is preferred, but you could put an NPO ceramic in parallel with a silver mica (or use a standard ceramic, not multilayer type) the two drifts can cancel out.

28th Sep 2018, 7:16 pm	#43
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Building the 'Minimod' AM modulator-questions! There are two possible cures to reduce drift. 1- replace the 10K inductors with 10EZ types, RWO6A6408 (red core) tunes MW. 2- I am not sure what type of parallel capacitor has been used, polystyrene or silver mica is preferred, but you could put an NPO ceramic in parallel with a silver mica (or use a standard ceramic, not multilayer type) the two drifts can cancel out.