UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Lafayette HA-350

cathoderay57 · 18th Oct 2021, 10:28 am

Yep, the diode worked a treat. The meter now swings over to max at switch-on, but only just max, and isn't hard against the stop. After about 15 seconds the valve starts conducting and the meter drops to zero. An adequate fix. I'm still not convinced the FET circuit hyperlinked in post #23 would work properly as-drawn since it permanently limits the AGE line to -0.6v. Jerry

18th Oct 2021, 10:28 am	#25
cathoderay57 Nonode Join Date: Oct 2017 Location: Bristol, UK. Posts: 2,387	Re: Lafayette HA-350 Yep, the diode worked a treat. The meter now swings over to max at switch-on, but only just max, and isn't hard against the stop. After about 15 seconds the valve starts conducting and the meter drops to zero. An adequate fix. I'm still not convinced the FET circuit hyperlinked in post #23 would work properly as-drawn since it permanently limits the AGE line to -0.6v. Jerry