UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - HT / filament transformers from Aliexpress

MrBungle · 7th Jun 2018, 5:58 pm

I peeled the dead one open and there was no solder joint. The terminations were twisted together and then taped and that’s it. Reason it was open because there was still enamel on the winding. Looks like someone forgot to poke it in the solder pot and forgot to QA it. FFS. Binned.

Edit: have been very distracted due to work but have been playing with the LT1073 switching regulator and have managed to get that to deliver 200V at 10mA with an external inductor and MOSFET plus voltage divider from a 12V source. Very nice IC but a little pricey. Now playing with that and E cores.

7th Jun 2018, 5:58 pm	#54
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: HT / filament transformers from Aliexpress I peeled the dead one open and there was no solder joint. The terminations were twisted together and then taped and that’s it. Reason it was open because there was still enamel on the winding. Looks like someone forgot to poke it in the solder pot and forgot to QA it. FFS. Binned. Edit: have been very distracted due to work but have been playing with the LT1073 switching regulator and have managed to get that to deliver 200V at 10mA with an external inductor and MOSFET plus voltage divider from a 12V source. Very nice IC but a little pricey. Now playing with that and E cores.