Feeding the screen grids from the 40% taps of the OPT primary does not mean that the screens are on 40% of the plate voltage! In fact, in idle the screens see B+ minus 40 % of the voltage drop that the plate current causes on the copper resistance of the winding. Without screen droppers the screen voltage would be a little bit higher than the plate voltage. But the point of ultralinear operation is that the screens also get 40% of the voltage swing across the OPT primary when playing the amp. When using fixed screen voltage you can go to the max permitted value as long as it doesn't exceed the plate voltage, and this should help the output power. You might not be the technically best of all amp tech's, but you achieve things, and I like that you put your hands to many different things. Also, your somewhat chaotic procedures (sorry) are quite entertaining, so you have earned my subscription!
Yeah I can admit, I have very little experience with Tapped OT's. None of my amps have them. I'm not sure I can deny your evaluation of me. I avoid marketing my videos as "how to" cause I dont' consider myself qualified to teach this stuff. I do go more for the entertainment value. I think I know more about the subject that many other techs, half cause of my knowledge outside of amps that still applies to them. Like being able to design a layout from scratch, and even improve existing designs. This was an older video series I made when I was "getting back into it" so to say after a long hiatus, so part of what you're seeing is my relearning. But yeah, I'm pretty much entirely self taught, and a lot of my lessons were hard won, hence the chaos. No offense taken.
@@DATT Very much agree with you. Yes, there are people doing 'teaching' YT videos on tube stuff and pretending competence, but putting a lot of nonsense out. I acknowledge, though, that OPT's are very complex devices. Your modest approach of just making things work for you without 'how to do' claim is very appreciable. I am myself largely self-taught, although having done half of a two-year electronics course more than 30 years ago. We hardly heard anything about valve - oops, tube electronics anymore then, and one of the tutors on the course regarded them as only good for fools. But general understanding about the workings of electronic circuits helps in many topics. I've been taken away into a different profession though, so nothing of 30 years experience! I'm aware that you intentionally put in a fair aspect of entertainment, and that's great! Keep up the good work!
Feeding the screen grids from the 40% taps of the OPT primary does not mean that the screens are on 40% of the plate voltage! In fact, in idle the screens see B+ minus 40 % of the voltage drop that the plate current causes on the copper resistance of the winding. Without screen droppers the screen voltage would be a little bit higher than the plate voltage. But the point of ultralinear operation is that the screens also get 40% of the voltage swing across the OPT primary when playing the amp.
When using fixed screen voltage you can go to the max permitted value as long as it doesn't exceed the plate voltage, and this should help the output power.
You might not be the technically best of all amp tech's, but you achieve things, and I like that you put your hands to many different things. Also, your somewhat chaotic procedures (sorry) are quite entertaining, so you have earned my subscription!
Yeah I can admit, I have very little experience with Tapped OT's. None of my amps have them.
I'm not sure I can deny your evaluation of me. I avoid marketing my videos as "how to" cause I dont' consider myself qualified to teach this stuff. I do go more for the entertainment value. I think I know more about the subject that many other techs, half cause of my knowledge outside of amps that still applies to them. Like being able to design a layout from scratch, and even improve existing designs. This was an older video series I made when I was "getting back into it" so to say after a long hiatus, so part of what you're seeing is my relearning.
But yeah, I'm pretty much entirely self taught, and a lot of my lessons were hard won, hence the chaos. No offense taken.
@@DATT Very much agree with you. Yes, there are people doing 'teaching' YT videos on tube stuff and pretending competence, but putting a lot of nonsense out. I acknowledge, though, that OPT's are very complex devices.
Your modest approach of just making things work for you without 'how to do' claim is very appreciable.
I am myself largely self-taught, although having done half of a two-year electronics course more than 30 years ago. We hardly heard anything about valve - oops, tube electronics anymore then, and one of the tutors on the course regarded them as only good for fools. But general understanding about the workings of electronic circuits helps in many topics. I've been taken away into a different profession though, so nothing of 30 years experience!
I'm aware that you intentionally put in a fair aspect of entertainment, and that's great! Keep up the good work!
@@regaldf.9493 Valve ? You in Europe ? Sounds like you have a fair many years on me.
Great vid, thanx
You're welcome !