what kind of transformer for a Z#9

[gionag]

hi guys,
i'm building the PS for the ZenV9. What kind of toroid i have to use ?

Mr.Pass, had used a 300VA 18x2V, But i seen guys who had used a 35x2V or other voltages.

With the original unregulated ps Board, what transformer can i choose ?

Thanks !

 

[steenoe]

The answer is both🙂 The 2x18 secondaries are used in series which equals 1x36V. The 35V secondaries are used in parallel (or one for each channel) The end-result is roughly the same.

🙂

Fast answer, ehh?😀

 

[gionag]

.... 😉

i'm an idiot ! i'm thinking about only SERIES, not PARALLEL 😀

for the parallel, i still use a 300VAC ?


Thanks a lot 😀 i'm a n00b 😀

 

[steenoe]

.... 😉

i'm an idiot ! i'm thinking about only SERIES, not PARALLEL 😀

for the parallel, i still use a 300VAC ?


Thanks a lot 😀 i'm a n00b 😀

I guess you can do it with a single 300VA (it doesnt matter if its the 2x18V or the 2x35V) If its a good quality unit it should be ok. I am using two pcs 2x18V, 300VA's in mine.

🙂

n00b's are very welcome🙂

 

[gionag]

i can't find anyone selling a 2x18V 300VAC trasformer.

Where i can look ?

Thanks a lot

 

[steenoe]

i can't find anyone selling a 2x18V 300VAC trasformer.

Where i can look ?

Thanks a lot

Maybe someone closer to you can answer that😉 Most electronic suppliers, carry toroid's.
Buying two of those with 2x18V secondaries is a very good choice.
You can build many of the Pass amps with such a pair. Almost all of the PassDIY and F amps use them🙂

🙂

 

[gionag]

another think.

the 300VA transformer is for both channels or a 300VA toroid each channel ?

If i'm right, Mr.pass, use a CCS in the zen #9 and the current is fixed to 2A, then a good toroid for ONE channel is 36 Volt X 2 Ampere = 72VAC.

It's true ?

thanks a lot

 

[gionag]

ahem, excuse, maybe i was too confusing in my explanation:

I need to know how much VAC i need for each channel...
it's better 1 toroid of 300VAC, or is enough 1 toroid of 150VAC per channel ?

(i don't want to use a single transformer for both channels)


Thanks a lot

 

[jacco vermeulen]

VAC = alternating current voltage
VA = voltage times current ~power

Rail voltage of the V9 is 50 volts, 36Vac rectified.
2 Amps times 50 volts = 100 Watts.
150VA works, but is not advisable, a 225VA would be the minimal transformer value.
300VA is more common, price difference between a 225VA and a 300VA transformer is not worth the saving.

 

[gionag]

perfect,
i've just order two toroid of 300VA / 36-0V @ 8.3A.

It's right ?

thanks to all

 

[thomaseliot]

I used only one 500VA 2X35VAC for my ZV9, one secondary for each channel. You can find it in Italy here

(for more than 80 euro you don't pay delivery) 🙂

 

[gionag]

i did a lot of order from this site... they have a very good things.

But, i've found a great transformer factory near my homeplace that is awesome.

For 2x300VA i'll pay only 100 euro and they surround the transformer with a special EMI foil that is a manna for audio equipment.

Thanks for the information anyway.

 

[thomaseliot]

Address please? 🙂

 

[CeeVee]

How about this:
http://www.selectronic.fr/article.asp?article_ref_entier=80.9697-9999

???

 

[gionag]

mhhh i think this kind of transformer have a little less power than Zen neeed.
You need at least 2x 160V.

At the end, i'll use a 2x300VA, one for each channel.

find a model with more power 😉

 

[CeeVee]

same place....that was just an example...there are 4 pages of them.

....but this is 500VA, not enough?


you could allways use 2x300VA like these:
http://www.selectronic.fr/article.asp?article_ref_entier=80.3263-9999

Very low noise, makes shielding not really necessary.

 

[thomaseliot]

This is what I would buy:

http://www.selectronic.fr/article.asp?article_ref_entier=80.9697-9999

One 500 VA cost much less than two 300VA, unless you want two monoblocks. 🙂