Filaments works from 3 to 6 volts and 1 to 3 amps.

Many radios run ac through the filaments. (no diodes, no cap)
What filament? Those numbers seem odd to me.
3V at 1A = 3 ohms. Many old radios use power resistors to limit the power in a filament. You could add a 3.0 power resistor in series with the filament and drive them directly from the 6.3V transformer.

 

Thank you for all your help.

My triodes are made by me, so I´m experimenting with different filaments configurations

Comercial tubes works with 6,3VAC, but it is easir to change the voltahe when is DC, so I use DC current for the filament

 

hi Rufius,
This circuit simulation uses a 500k potentiometer to set the +B voltage.
Add the R8, 27k and change R7 to a 5k6.

As you can see the plot shows a voltage +B range of ~30v through to ~ 300v.

Increase the wattage of R1 to 3Watt,

Do you follow OK.???
E

Ooook, now everything works nice. Thank you a lot

Also Thank you for the PDF about heatsinks. Now, I know how to calculate it

 

hi Rufus,
You can compare your circuit voltages with simulation, using 230VAC RMS input.
Post your voltage measurements.
E
View attachment 369280

WHO??? Has an 8-digit voltmeter?? Especially, who has an ACCURATE 8 digit voltmeter?? Even an ACCURATE six digit DC voltmeter is an expensive "calibration lab" device.
8 digit resolution voltage measurements come fro simulators , not actual circuits.

 

HI BILL @MisterBill2
THE TS DOES NOT NEED AN 8 DIGIT DVM IN ORDER TO COMPARE RESULTS.

PLEASE READ AND UNDERSTAND WHAT MY POST SAID !!!!!!

The TS clearly understood my post and his project is working as my posted edited design

You are causing confusion and misunderstanding on many of Your posts.

E

 

My point was intended to be that in most applications, more than three or four signifigant digits are not available and usually not able to be measured. Certainly projects may have voltages present that are actually "close enough but not exactly." And very few folks have digital meters with over 4 1/2 digits, while most DMMs provide 3 1/2 digits.

 

Hi,
In order to compare a circuits voltages, even a 3 1/2 digit is NOT required.
Don't you understand the meaning of compare?, the TS certainly does.

I will repeat:
You are causing unnecessary confusion and misunderstanding on many of Your posts.

E

 

one can edit data label to round values. common is to replace $ with round($*1000)/1000. then one can copy this label and place it on other nodes in the circuit.

btw. it is very noticeable that some forum member(s) are notorious critics. they moan and complain all the time, nitpick and point out every detail in work of others... but they NEVER find the time to post a circuit or simulation of their own. creating content takes time and effort.
talk is cheap, so if one is to complain about posts of others, the least they need to do is show their own work...

 

OK, I get the point.