UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 120W PP EL34 amplifier re-born.

dave cox · 27th Sep 2018, 4:18 pm

I reckon Chris has it, foldback limiting. The 'LM will do everything it can to mantain it's ref pin at the ref voltage, short of self distruction ! There are current and thermal limits operating so it can look quite complex. But, if it drops out its just not man enough for the load!

dc

PS. that scope trace will look better in ALT mode

27th Sep 2018, 4:18 pm	#17
dave cox Nonode Join Date: Jan 2009 Location: Bristol, UK. Posts: 2,061	Re: 120W PP EL34 amplifier re-born. I reckon Chris has it, foldback limiting. The 'LM will do everything it can to mantain it's ref pin at the ref voltage, short of self distruction ! There are current and thermal limits operating so it can look quite complex. But, if it drops out its just not man enough for the load! dc PS. that scope trace will look better in ALT mode