Power supply construction

[Tdale]

This is maybe a bit off topic, but I saw that someone posted their power supplies, and I have some questions.

Usually, there is one outlet for each tube, B1, B2, B3 etc. Every outlet has a cap to ground and a resistor in series with the current.

I suppose this makes the current more and more ripple-free, since it gets filtered several times, making B5 more ripple-free than B1.

But let's say that I have a power supply with 5 B+'s, One for the OT, One for output tubes, one for PI, one for OD and one for Preamp.

What if I decide to put in a dumbleator too. Do I need to modify my powersupply to have a B6, by adding a cap and resistor, or can I use one of the other B+'s for the dumbleator tube?

In essence, do I need one filter cap and resistor for each tube in the amp, or can several tubes share one filter/resistor?

Tommy

[jelle]

Hi Tommy,
The way I understand it is that when more tubes draw from the same outlet, the headroom for those stages will drop. I'd add a cap and resistor in paralel (with the stage next to the phase inverter) for the dumbleator power supply.

Good luck,
Jelle

[Tdale]

Only a cap/resistor in paralell, not a resistor in series with the current?

[Normster]

I hope you get a definitive answer, Tommy. That's what I'm trying to achieve with my PS layout. The reason I went with an additional stage of filtering is so I can control the plate voltage on the reverb tube. However, on a previous build, I tapped V1 to power the reverb tube and had no issues (other than low plate voltage to the reverb).