Background:
I'm pondering a design which uses TV sweep tubes as the output devices, based on an article which revisits Crowhurst's twin coupled amplifier.
In the article, the author mentions that the power dissipation of a sweep tube can be safely increased by ~40% in an audio amplifier application. A reference to the RCA Receiving Tube Manual is cited, and sure enough, there are examples there.
In this design, the anode voltage is pretty much at the design max rating of 400 V, and the screen grid voltage is at 320 V (design max is listed as 300 V). Fixed bias is used in this design.
The Question:
I'm at a point where I'm attempting to draw load lines, and I'd like to understand what's happening. The problem I think I have is that the data sheet only has cathode current and anode voltages up to a screen grid voltage of 150 V. How do I go about estimating the effect on power and grid voltage swing where the screen grid voltage is almost literally off the chart? Does it even matter?
I'm pondering a design which uses TV sweep tubes as the output devices, based on an article which revisits Crowhurst's twin coupled amplifier.
In the article, the author mentions that the power dissipation of a sweep tube can be safely increased by ~40% in an audio amplifier application. A reference to the RCA Receiving Tube Manual is cited, and sure enough, there are examples there.
In this design, the anode voltage is pretty much at the design max rating of 400 V, and the screen grid voltage is at 320 V (design max is listed as 300 V). Fixed bias is used in this design.
The Question:
I'm at a point where I'm attempting to draw load lines, and I'd like to understand what's happening. The problem I think I have is that the data sheet only has cathode current and anode voltages up to a screen grid voltage of 150 V. How do I go about estimating the effect on power and grid voltage swing where the screen grid voltage is almost literally off the chart? Does it even matter?