Locked Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
¿ªÔÆÌåÓýHalden, I will bypass most of your writings for now and just say the first? img {16} looks as expected. The second img {20} with the shorted turn has a current waveform as expected, but it is strange that the current amplitude is so low. Just to be sure is the voltage measured at the transformer primary? And not into the dim-bulb? ?I am missing something. From: [email protected] [mailto:[email protected]] On Behalf Of HF via groups.io
Sent: Tuesday, September 24, 2024 1:38 AM To: [email protected] Subject: Re: [HallicraftersRadios] HT-37 transformer failure due to rapid STBY-->OFF-->STBY ? Hi Don, ¡¡¡--------- Today, I made some measurements to explore the significance of a single-turn short and how to detect it before it causes further damage.? I was unable to reliably cause adjacent turns in the HV winding to contact each other with low resistance, so I created one in the 5V filament winding above it.? I scraped insulation off and used a crocodile clip to hold the wires together.? This represents a worst or worse than worst case configuration, as a real short would probably not include such a low-resistance contact. The images below show ¡¡.---------------------------------- -- don??? va3drl |
don Root