Power Supply Tube Preamplifier.

[Pim Driessen]

Dear Forum Members,
I have a question about a current limitation in a power supply for a Tube preamplifier output 215 Volt.
The question is Does this work if you accidentally create a short circuit?.
Here is the diagram of 2 different power supplies, the first one broke due to a measurement error, of which it is not entirely clear what went wrong.
The second diagram is of a tube preamplifier from Audio and Technology from a long time ago, I personally think the current limitation of Audio and Technology looks better.
When I simulate in Tina Software, the current limitations of both seem to work, but as I wrote before, the power supply board of the first diagram broke after a short circuit.
What is the opinion of this Forum about the two power supply diagrams?.
Greetings,
Pim

 

[crutschow]

Need to know if the voltage rating of the pass transistors is greater than the supply voltage.
Also what is there power rating, and are they on a heat-sink?

 

[jaclement]

Go to this link. the idea is that you use a high voltage pass transistor as a preregulator controlled by the 317. The zener shifts the prereg enough higher to power the 317 It will need several diodes to protect the 317 when it is turned off to prevent hv capacitors from destroying the 317. It has no current limit.

http://www.ti.com/lit/an/snva583/snva583.pdf

 

[jaclement]

Also , build a regulated DC supply for the tube filament(s)

 

[Pim Driessen]

Hi, Crutschow,
The transistor used is Bus 11, and it is located on a heatsink.

 

[Pim Driessen]

Each tube has a regulated DC power supply for the tube filament(s).

 

[Pim Driessen]

That's a nice solution if the voltage would be higher, my tube preamplifier needs 215 volts on the anode.

 

[Pim Driessen]

This is the Tube Preamplifier with 2 pieces ECC802S tubes, one tube per channel.