Tube Amplifiers Explained, Part 9: Screen Voltage and Ultralinear Mode
A Single Ended Tube Amp for the masses! - Part II
Using A Pentode As A Triode - Quantumnet
triode/pentode switch on self-bias 6l6's
VTA Tube Amp Kits - All the Dynaco VTA amps may be run in either ultralinear mode or triode mode. They all have a switch that allows going from one mode to
Merlin's morphing Pentode/Ultralinear/Triode EF86 - The Amp Garage
triode/pentode switch on self-bias 6l6's
Using the Pentode/Triode Tube as the Amplifier/Phase Splitter.
Octode Topology
triode / pentode
Mesa Boogie Mark III head (3++ mod & Pentode/Triode switch) | Reverb