Filament with lm317 gets hot

[grunf]

TL1963(adj.) , trans. 7V sec. ,smd schottky diodes , output 6,3V(adj.), 1,5A ,very simple and good

 

[v4lve lover]

Very nice, my guess is you could even lower the input voltage to standard 6.3V and it will still work.

 

[Ryssen]

7V at rated current would be safer. Better some flexibility than having too low voltage. When calculating too tight and mains voltage one day is too low the regulator might not regulate. Do you know how to calculate this?!

I do it regularly but it all starts to pose challenges. Then transformer A works OK and transformer B does not. Schottky diodes are recommended in any case with small margins just as large filter caps. If you mean a standard 6.3V filament winding well you have to measure under load and verify if it will work. I have 6V 3.4A transformers that work perfectly as they are 6.8V with 2A load in reality.

Show me how to calculate that.

 

[jean-paul]

Of course I can and want to but not right now. Maybe another member can step in and get into that. I was very ill for a long time and only now I start to feel better. Need my rest.

The complete story seems to be written by the real master in electronics. Maybe a tad too much for you but all I could find for now.

https://sound-au.com/power-supplies.htm

 

[Ryssen]

To much for me..

 

[jean-paul]

Then I think my explantion/calculation will also be too much. If things are tight then have it calculated based on the choice of regulator here in this thread. First determine what current you need and which regulator you will choose. BTW v4lve lover has complete PCBs ready built for use with 6.3V secondaries...LDO regulator discretely built with a MOSFET.

Shameless advertising of a members stuff: https://www.diyaudio.com/community/...pplies-mic5156-based-tube-amp-upgrade.382265/

 

[Ryssen]

I ordered one modul from him thanks for the tip.