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

Lucien Nunes · 25th Jan 2023, 2:24 pm

I agree that a refined amplifier working under normal conditions is not likely to exhibit excess voltage excursions due to a disconnected load. I was playing safe for the benefit of those many users of valve amps who routinely apply extreme working conditions to their output stages. E.g. some kinds of 'music' could drive what is supposed to be a low-bias AB1 into grid current, charging the coupling capacitors enough for both valves to get momentarily cut off.

25th Jan 2023, 2:24 pm	#18
Lucien Nunes Rest in Peace Join Date: Apr 2008 Location: London, UK. Posts: 2,508	Re: Using a speaker switch I agree that a refined amplifier working under normal conditions is not likely to exhibit excess voltage excursions due to a disconnected load. I was playing safe for the benefit of those many users of valve amps who routinely apply extreme working conditions to their output stages. E.g. some kinds of 'music' could drive what is supposed to be a low-bias AB1 into grid current, charging the coupling capacitors enough for both valves to get momentarily cut off.