Tube vs. Semiconducter rectification

[Wavebourn]

I'm sorry but I don't follow, are you saying it ain't good?

What do you think, it is good? Why?

 

[JojoD818]

I posted it as an example which I haven't tried myself. But if you think the circuit ain't worth it, would you care to explain?

Btw, SY's recommendation of using cheap thermistors works for my projects when using ss rectifiers, that's probably one of the reason why I haven't tried the circuit in the link I posted.

 

[Wavebourn]

I posted it as an example which I haven't tried myself. But if you think the circuit ain't worth it, would you care to explain?

Btw, SY's recommendation of using cheap thermistors works for my projects when using ss rectifiers, that's probably one of the reason why I haven't tried the circuit in the link I posted.

I agree with you, the termistor limits inrush current while abrupt switching generates it.

And I still don't understand what is good in waiting until tubes got hot before abruptly shitching on B+...

 

[JojoD818]

Most of the guys here don't have a problem applying the full B+ on a cold tube, but I don't know their take on applying the B+ on a hot tube though.

 

[rubli]

Problem is, that when you apply Voltage to a tube that is not at its operating temperature, cathode stripping begins eventually to occur. This circuit enables to pass a small amount of current while the tubes are getting to its optimal temperature.

it's like the standby switch on fenders, but without the risks involved in having the B+ running in front (or rear) of the chasis.

regards

Alex