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Old 5th February 2010, 10:35 PM   #541
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Quote:
Originally Posted by agithegreat View Post
Is it possible to use a single 12v output from a transformer (at say 2a) and use this to run the entire shunt board?

Or are we better off using individual windings for the AD1865 and a separate one for the CS8414?

Also how critical is the 250v requirement onto the valves?
Could 220-250v be ok? Or is 250v an apsolute must?
Hi! agithegreat!
you can see post 540 please!
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Old 5th February 2010, 10:42 PM   #542
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Originally Posted by toufu View Post
I just bought some 270uf on ebay, is that OK?
Yes! it is used, however a little extra!
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Old 5th February 2010, 10:42 PM   #543
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Thats ok, thanks. So at least 250v.

What about the 12v though? Is using one bigger transformer suitable, to parallel across them all, or should I use 3 separate ones/ windings?
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Old 5th February 2010, 10:45 PM   #544
adamus is offline adamus  United Kingdom
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Theoretically 3 seperate is better. and seeing as the dac is overkill throughout you should stick with tradition.

I had a quote of canterbury windings for a custom toroid @ 75 shipped.

I think you will do very well to beat that with seperate transformers in the uk.

I sent a few quote requests out today to places like airlink. I'll report back. I still think custom is the way to go on this.
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Old 5th February 2010, 10:48 PM   #545
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Quote:
Originally Posted by adamus View Post
Theoretically 3 seperate is better. and seeing as the dac is overkill throughout you should stick with tradition.

I had a quote of canterbury windings for a custom toroid @ 75 shipped.

I think you will do very well to beat that with seperate transformers in the uk.

I sent a few quote requests out today to places like airlink. I'll report back. I still think custom is the way to go on this.
I'd agree, but the flag is a little confusing... I'm from the UK, but for the past 4 months i've been in the US, and i'm here another few months, so i'm getting it much cheaper than home .
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Old 5th February 2010, 11:22 PM   #546
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Quote:
Originally Posted by agithegreat View Post
Thats ok, thanks. So at least 250v.

What about the 12v though? Is using one bigger transformer suitable, to parallel across them all, or should I use 3 separate ones/ windings?
Yes 250V at least.

not parallel two + 5V and - 5V , only used in +5V ( can you one )
3 separate is the best!
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Old 5th February 2010, 11:29 PM   #547
Ekkeri is offline Ekkeri  Finland
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Quote:
Originally Posted by audiodesign View Post
In the DAC End ver. 2 we must use 265-275V to get a low distortion because many voltage are lost on anode resistors and on the anode there are about 180v.
Quote:
Originally Posted by audiodesign View Post
In any case use a 220:9+9 100w for the filaments and to drive a 9+9:220 50w to get also the 220V ac of anodic voltage is ok
Quote:
Originally Posted by quanghao View Post
Yes 250V at least.
I'm getting little confused in here.. Could you deside already?

220VAC would be a easy find, but >250VAC is a harder one.. And how about the current? Andrea said min. 200mA, but there are 100mA in quanghao pic and 50mA here.
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Old 6th February 2010, 12:25 AM   #548
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Quote:
Originally Posted by Ekkeri View Post
I'm getting little confused in here.. Could you deside already?

220VAC would be a easy find, but >250VAC is a harder one.. And how about the current? Andrea said min. 200mA, but there are 100mA in quanghao pic and 50mA here.
===============================================

This 100VA Transformer can be suitable for the power stage (Tubes + Heater)

R80-36 primary (0-110) x 2 /SCN: scondary (260-230-0-230-260)(200mA), 2.5-0-2.5(3A), 3.15-0-3.15) X 2(3A)

Easy to get 8.15V for heater Series 2.5+2.5+(3.15parallel)


Available from diyclub.biz
DIYCLUB

For Salas use three little separate transformers possibly toroidal. EI can be noisy if you don't orientate them properly inside the case . Better than a single one with 3 x 9V. They can still jam inside the same transformer. Why on the board you got 3 separate AC inputs and not one? Because you want to avoid jamming signal. So in the same way go to the end! 3 separate transformers is more Hi-End. The AD1865 is the architect of the sound. If he's drunk how can he make good sound? It's up to you.

Last edited by apelizzo; 6th February 2010 at 12:54 AM.
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Old 6th February 2010, 12:29 AM   #549
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Ok! i seen! 50ma if the quality transformer is the best!
Iy you buy the traformer is poor quality, can not use ! ( because i change 2 transformer for supply hight voltage!
The iv spend about total more 32ma !
thank
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Old 6th February 2010, 12:36 AM   #550
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For Salas use three little separate transformers. Better than single one with with 3 x 9V. They can still jam inside the same transformer. Why one the board you got 3 separate AC input and not one? To avoid jamming signal. So in the same way go to the end! 3 separate transformers is more Hi-End.[/QUOTE]

using three separate transformer is too good, but so is too expensive and unnecessary, because the shunt Salas help you do that ( the Salas shunt is exelent im sure), so just a transformer with three outputs is ok, and the best!
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