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

theoldtrout · 28th Jan 2010, 11:38 pm

Have a search of some of the audio forums such as diyaudio, you'll find a few examples. Many years ago I built a single ended PL509 amp, fixed bias and driven from g1 - needed about 100Vpp+ if I remember. I've not come across driving the PL509 from the screen though; what is the advantage for audio?

28th Jan 2010, 11:38 pm	#4
theoldtrout Hexode Join Date: Sep 2008 Location: Charlton Mackrell, Somerset, UK. Posts: 315	Re: EL or PL509 as an audio output valve. Have a search of some of the audio forums such as diyaudio, you'll find a few examples. Many years ago I built a single ended PL509 amp, fixed bias and driven from g1 - needed about 100Vpp+ if I remember. I've not come across driving the PL509 from the screen though; what is the advantage for audio?