Part 2: Introduction into the Universal System of The Vanderveen Project
All tubes in valve amplifiers have in common that the cathode is hot, emitting free electrons which are collected by the positive anode. The amount of electrons going from cathode to anode is determined by the negative voltage at the control grid.
Read more …Part 2: Introduction into the Universal System of The Vanderveen Project
Part 3: The Universal System (first section) of The Vanderveen Project
In a tube the current runs from anode to cathode. The control grid determines the amount of current. When we wish to extract power from the tube, we should connect the output transformer to where the current runs, also to the anode or to the cathode or a combination of both.
Read more …Part 3: The Universal System (first section) of The Vanderveen Project
Part 3: The Universal System (second section) of The Vanderveen Project
Three forms of local feedback are possible with the screen grid of a power tube. The screen grid connected to the anode creates a triode. When the screen grid is connected to a tap on the primary winding, we have the ultra linear configuration. In the pentode mode the screen grid is connected to a constant voltage supply.
Read more …Part 3: The Universal System (second section) of The Vanderveen Project
Part 4: The output transformer GIT80 of The Vanderveen Project
The core of the GIT80 is not gapped, therefore the primary inductance LP is large. At low frequencies all the energy from the tube goes into the loudspeaker while the core loss is negligible. Single ended circuits now need quiescent current compensation. The core is large and can handle 80 Watt. The figure shows the windings and their taps plus dimensions and technical specifications.
Read more …Part 4: The output transformer GIT80 of The Vanderveen Project
Part 5: The power transformer POW80 of The Vanderveen Project
The sizes of the POW80 and GIT80 transformers are equal. At the primary side mains voltages of 100, 115, 200, 230-240 V (50 or 60 Hz) can be connected. An electrostatic screen stops disturbing signals from the mains. The two windings of 270 V are for two separate high voltage supplies. The negative control grid voltage is delivered by the 50 V winding, while the filaments of the tubes are powered by the 6.3 V winding.
Read more …Part 5: The power transformer POW80 of The Vanderveen Project