help for psu

drews · 27th November 2005, 12:30 PM

Hi,

I have found some DIY KIT for tube preamplifier.
Now I wolud build a pre with 6DJ8 that is inspired by ARC ls-10.
For PSU I have found 2 different type: one completely with tube and the other one with tube and transistor.
I don't know if tube power supply has output 6,3dc or 6,3ac.

Thanks
Andrea

drews · 27th November 2005, 12:33 PM

This is tube psu....

drews · 28th November 2005, 01:32 PM

Can anyone help me? Wich is better project?
In the tube power supply, are the 6,3 and 12v AC or DC?

Thanks

Simpleton · 28th November 2005, 02:06 PM

You can either use AC or DC for heating up the filaments, as the tubes are all indirectly heated, so there should be no hum problems.

Tube or hybrid PSU... Honestly, i would go for tube, as it's what i've been using in all of my projects so far, and haven't had any problem until now (knock on wood). All in all, it's a matter of preference.

dhaen · 28th November 2005, 02:14 PM

The heaters for the tubes in such circuits are usually AC, but this must be "floated" at a DC potential, perhaps 1/2 the output DC voltage.

Do you realy need such a complex circuit? Here is something much simpler:
WAD

There are other more modern circuits using MOSFETs as regulators if you need voltage regulation. They are much simpler.

28th November 2005, 02:06 PM	#4
Simpleton diyAudio Member Join Date: Jan 2005 Location: Lisboa	You can either use AC or DC for heating up the filaments, as the tubes are all indirectly heated, so there should be no hum problems. Tube or hybrid PSU... Honestly, i would go for tube, as it's what i've been using in all of my projects so far, and haven't had any problem until now (knock on wood). All in all, it's a matter of preference. __________________ "There's something organic about a happy cloud of electrons" - Neutron Bob

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28th November 2005, 01:32 PM	#3
drews diyAudio Member Join Date: Jan 2005 Location: Roma	Can anyone help me? Wich is better project? In the tube power supply, are the 6,3 and 12v AC or DC? Thanks

28th November 2005, 02:14 PM	#5
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	The heaters for the tubes in such circuits are usually AC, but this must be "floated" at a DC potential, perhaps 1/2 the output DC voltage. Do you realy need such a complex circuit? Here is something much simpler: WAD There are other more modern circuits using MOSFETs as regulators if you need voltage regulation. They are much simpler.

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