LCL for 2A3 filament

[juanitox]

What will be the optimal value for a LCL power supply filter for a 2a3 2,5v Dc filament.

 

[audiowize]

You want to heat your 2A3s with 5V?

Tell us about your power transformer? You could do just an LC filter if you have a 6.3V winding with a center tap using a full wave rectifier.

 

[juanitox]

Sorry my mistake 2,5v dc for sure , i have 2.5 tap ..

 

[316a]

What will be the optimal value for a LCL power supply filter for a 2a3 2,5v Dc filament.

You may find a Coleman reg with choke input DC is the way to go . Filament supplies tend to get awfully large , heavy and expensive when you go LCL .

316a

 

[kevinkr]

+1 for the Coleman regulator, I use these in all of my SE designs.

 

[audiowize]

I will be the dissenting voice and say not to use Coleman regulators with 2A3s unless you're making a headphone amp.

What is the AC current rating of your 2.5V winding?

 

[juanitox]

5amp each
I have tried ac with a center pot , sounds good but too noisy for my 102db fullrange speaker,
I currently use a coleman reg with a Schootky rectifier and a CRC filter ( 47000uf / 0,1R/47000uf )
Very very quiet but the 2a3 souds too clean to be true . So that’s why i want to experiment something else ..

 

[audiowize]

You'll need to stick with a cap input filter to keep the voltage up. What voltage do you see at the output of your current supply?