Direct Heated Triode

Px25 vr40 direct heated triode

2A3, 6B4G, VT-25A, 811A, Directly Heated Cathode Triode Vacuum Tube Power Amplifier Project

ElPaso TubeAmps

VT-25A (circa 1940's) Directly Heated Cathode Triode Vacuum Tube Amplifier

ElPaso TubeAmps

audio lecture 29, USA 845 vs Russian GM70, high power direct heated triode amplifier tubes

4 DHT tubes physical electrical spec analysis ; FLUXION audio tube amplifiers, 300B, 811-10 SET

Preamp based on GU-4 USSR direct heated triodes - this is a real tube magic :)

Doctor Angelicus

300B vs 6C33C-B triode tube amplifier blind test ; FLUXION audio model JS-4 and E-3

What do vacuum tubes (valves) do?

audio lecture 49, high mu triode 572B, for class A2 AB2 high power SE or PP tube amplifier

Audio amplifier made by "19", the 1930's twin triode

Push-pull amplifier using 5672 direct heated tubes

Thomas Hafemann

Vacuum Tubes I have Known – Part 2

Steve's Trivia - by Steve Wagner

Vacuum Tube Power Amplifiers: Part 4

How Vacuum Tubes Work

B406 DHT Preamp DIY - single stage Anode follower

edSuwan DiyAudiophile

Vacuum Tubes I Have Known - Part 5

Steve's Trivia - by Steve Wagner

The Making of a Triode (European Triode Festival)

300b drive 300b PSE ( Otomon Ultimate Direct heat tube Driver Circuit )

Uesugi Ken (soundgate.net)

GM70 SE tube amp Zero NFB ( Otomon Ultimate Direct Heat tube drive Circuit )

Uesugi Ken (soundgate.net)

300B DIY Budget Tube Amplifier Build DHT SET

Skunkie Designs Electronics