the modder 's diary part 10:
in parallel of thinking about the best power supply i also did some work on how to arrange all the components to have a full double mono star topology of the power and signal paths.
to achive this and also to minimize the influence of the power consumption of one tube to the other tubes, it is important to connect power BETWEEN DF91 and DL 92 and not at the end after the DL92.
and to have a star topology of the power paths in general independent of using one power supply for all tubes or for left / right channel or for each tube separately the tubes have to be positioned in a different way:
DF91 DL92 - left
DF91 DL92 - right
to really implement and test this i made a modular tube base to learn more about the real implementation, placement of electronic components, separating and separated layers for input signal path, anode voltage, led voltage, filament / heater voltage, output signal path.
Read more: (Click to show)
for easier drilling and shaping i made the prototype tube section out of pertinax prototyping boards where also components can be placed and soldered:
here you see the new arrangement of the tubes and tube sockets to provide a star topology for the power paths and additional pcbs for the next layers::
the orientation of the tube sockets is as you can see on the picture above so that most of the pins for filament / heater power are oriented / placed in the center / middle of the pcb to have this power path as short as possible.
first layer with the tube sockets mounted:
at the moment i think of using this first layer for the filament / heater voltage. the tube sockets are NOS german ceramic ones, hart plated gold contacts, a tunnel in the middle that can be used for the led's, and even providing the possibility of mounting metal shields for the tubes.
at the moment i think of using this layer for the eletronic parts and components, i.e. the signal paths.
at the moment i am thinking of using the third layer for the anode voltage and anode voltage stabilisation.
the center hole for a thick ground line is missing and not drilled at the moment
as can be seen the led's to illuminate the tubes can be inserted through the middle hole and channel provided by the tube sockets, so it is much easier to change the led's and so the color of the light. and of course the led power path so is also separated.
everything mounted together:
and here with tubes (but inserted differently than posted above):
don't know if this is the final arrangement for the layers, and if the space on the pcbs on the left and right is not needed, i will cut the pcbs later.
this will be my first complete rebuild of a tu-05!
Edited by GermanGuy - 1/1/14 at 4:08am