ARC style regulated psu, tubed

sajti · 27th August 2010, 12:24 PM

Hi,

I like the ARC style, well regulated power supply. The only thing I hate, is the MOSFET, they use as series pass element.
I try use tube in that position. The circuit is not yet tested, because of my limited time.
Please comment the circuit! Is it worth, to try?

Sajti

SY · 27th August 2010, 12:29 PM

Why not use Jan Didden's well-designed and proven T-Reg?

sajti · 27th August 2010, 12:36 PM

Quote:

Originally Posted by SY

Why not use Jan Didden's well-designed and proven T-Reg?

I don't know T-Reg. I just want to plan something by myself.

Sajti

SY · 27th August 2010, 12:43 PM

Nonetheless, you want to at least read through Jan's article about it (I think it's on his linearaudio.nl website) to see what sort of engineering decisions have to be made and what the tradeoffs are.

sajti · 27th August 2010, 12:57 PM

Quote:

Originally Posted by SY

Nonetheless, you want to at least read through Jan's article about it (I think it's on his linearaudio.nl website) to see what sort of engineering decisions have to be made and what the tradeoffs are.

I just checked his website. T-Reg looks quite good. I hope, that my regulator can gives same good results.

Sajti

sajti · 27th August 2010, 01:22 PM

There can be some planning decisions, I have to explain:

I use 6550, because I have some of them. And the parameters are ideal for this application. The power supply should give 330V/40mA. This means 120V on the 6550, and -Ug1 about -7-8V, which is acceptable for the opamp.
For lower output current ECC99/5687/ECC82 is useful as well.
I use no series pass triode, such as 6AS7G, because they need more negative grid voltage, which is out of the opamp's output range.
I use the 6550 as tetrode, not as triode. Triode connection can be more simple, without 100uF capacitor. But the additional filtering on the 2nd grid means much better ripple rejection without increasing the loop feedback.

Sajti

27th August 2010, 12:29 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Why not use Jan Didden's well-designed and proven T-Reg? __________________ If there's a sucker born every minute, where do the rest of them come from?

27th August 2010, 12:43 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Nonetheless, you want to at least read through Jan's article about it (I think it's on his linearaudio.nl website) to see what sort of engineering decisions have to be made and what the tradeoffs are. __________________ If there's a sucker born every minute, where do the rest of them come from?

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27th August 2010, 01:22 PM	#6
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	There can be some planning decisions, I have to explain: I use 6550, because I have some of them. And the parameters are ideal for this application. The power supply should give 330V/40mA. This means 120V on the 6550, and -Ug1 about -7-8V, which is acceptable for the opamp. For lower output current ECC99/5687/ECC82 is useful as well. I use no series pass triode, such as 6AS7G, because they need more negative grid voltage, which is out of the opamp's output range. I use the 6550 as tetrode, not as triode. Triode connection can be more simple, without 100uF capacitor. But the additional filtering on the 2nd grid means much better ripple rejection without increasing the loop feedback. Sajti