2018年12月28日 · Therefore, if in a UL 6L6 design -- operating with fixed bias and 500 volts B+ -- the plate voltage swings from (about) 500 vdc down to 80 vdc under full power conditions, then the screen grid voltage is also dropping from (about) 500 vdc, down to 319 vdc.

Working with data and trying out a few configurations led me to believe that the 5kΩ load would be a better fit for the 6L6 in SE-UL configuration. As before, I wanted to control for constant plate voltages, choose several values based on data sheet information and vary the bias levels at these plate voltages to see how the tube performs.

2013年3月11日 · The 6L6 really isn't all that amenable to UL, due to the low screen voltage limitation. You'd be better off with parallel local NFB, or cathode lNFB if you have an OPT with a center tapped secondary (or a selection of different loads -- the 4.0R connection is a center tap to the common and 16R outputs).

UL mode "finals" operating in Class "AB1" should work out for you. Triode wired Class "AB2" is a possibility. DC coupled MOSFET drive can be a distinct plus in an "AB1" amp.

2010年6月25日 · Hey guys, as my first majorish valve project, I'm planning an stereo class AB2 amp using 6P3S's in the output stage. Most of you guys probably know this but they're pretty much the same as the 6L6GB; a lower rated 6L6GC.

2024年10月8日 · Having performed the study of the 6L6 tubes in an SE-UL configuration, and seeing the excellent performance which could be achieved, I decided to put the data into a practical application. This amplifier is the result.

2017年6月22日 · Here are the schematics for my 6L6 ultra linear amplifier that is the power amp in my main system. It's a fantastic sounding amp, and can do 28.5W/ch before clipping sets in.

2025年2月9日 · Optimized SE-UL 6L6 output. The first requirement, "Multiple selectable inputs", is self explanatory and supports my desire to have multiple input sources for my office system without jockeying equipment or cables.

NEW Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

2014年9月9日 · Instructions to build a Single-Ended (SE) 6L6 / 5881 Vacuum Tube Amplifier. Power output is about 10 Watts in class-A operation.