Hi,
I would like to ask to people that designs his own instrument tube amps, what are their preferences.
The most common scenario is to bias at 50-70% of max plate dissipation and then have a steep load line that heavily crosses the maximum plate dissipation.
So the loadline crosses the knee of the pentode on the far right, and being limited to AB1 the anode goes down to 100-70V at max swing.
Then gnfb is used to get some more control on bass, plus add presence and depth.
The only exceptions are most EL84 based amps, that use an Hi-Fi like load line of 8k with bias around 100%, and some old Marshall that run KT66 on 6.6k or even 8k Raa.
Is anyone using loadlines that never crosses the max plate dissipation curve, with or without feedback, and what are the goals you want to achieve?
Thanks
Roberto
I would like to ask to people that designs his own instrument tube amps, what are their preferences.
The most common scenario is to bias at 50-70% of max plate dissipation and then have a steep load line that heavily crosses the maximum plate dissipation.
So the loadline crosses the knee of the pentode on the far right, and being limited to AB1 the anode goes down to 100-70V at max swing.
Then gnfb is used to get some more control on bass, plus add presence and depth.
The only exceptions are most EL84 based amps, that use an Hi-Fi like load line of 8k with bias around 100%, and some old Marshall that run KT66 on 6.6k or even 8k Raa.
Is anyone using loadlines that never crosses the max plate dissipation curve, with or without feedback, and what are the goals you want to achieve?
Thanks
Roberto