# 2 transformers vs 1

P

#### pil

Jan 1, 1970
0
I need about 1200VA power from a transformer. I need 52-0-52. What is the
cheapest to take one huge transformer or 2 smaller ones wired in parallel?

J

#### John Fields

Jan 1, 1970
0
I need about 1200VA power from a transformer. I need 52-0-52. What is the
cheapest to take one huge transformer or 2 smaller ones wired in parallel?

---
Seems like just the savings in not having to deal with two separate
items would make the 1200VA cheaper than two 600's, and that seems to
be borne out by WW Grainger's catalog, which offers a vanilla Square D
1.5S1F (1500VA) for $204.25, and a 750SV1F (750 VA) for$123.85.

YMMV, do your own legwork and find out for sure...

W

#### Watson A.Name \Watt Sun - the Dark Remover\

Jan 1, 1970
0
John said:
---
Seems like just the savings in not having to deal with two separate
items would make the 1200VA cheaper than two 600's, and that seems to
be borne out by WW Grainger's catalog, which offers a vanilla Square D
1.5S1F (1500VA) for $204.25, and a 750SV1F (750 VA) for$123.85.
YMMV, do your own legwork and find out for sure...

True. However if you're a purist and are going to use these for a
stereo, then splitting the amps into two amps each with separate power
supplies will give better performance. ANd also if you're fitting the
xformer into a rack, then two may have a lower profile than one.

Oh, one other thing. If you're gonna plug this into the regular wall
outlet, then having two separate transformers may allow you to use two
different outlets so that you don't overload a single outlet. But then,
if you're going to need that much power, you should have a special power
outlet installed.

P

#### pil

Jan 1, 1970
0
John Fields said:
parallel?

---
Seems like just the savings in not having to deal with two separate
items would make the 1200VA cheaper than two 600's, and that seems to
be borne out by WW Grainger's catalog, which offers a vanilla Square D
1.5S1F (1500VA) for $204.25, and a 750SV1F (750 VA) for$123.85.

YMMV, do your own legwork and find out for sure...

Thanks John. Those things seem so expensive. I don't know where I am going
to get the bucks for it. I need to do this for a design project at my
university

P

#### pil

Jan 1, 1970
0
Watson A.Name "Watt Sun - the Dark Remover" said:
parallel?

True. However if you're a purist and are going to use these for a
stereo, then splitting the amps into two amps each with separate power
supplies will give better performance. ANd also if you're fitting the
xformer into a rack, then two may have a lower profile than one.

Oh, one other thing. If you're gonna plug this into the regular wall
outlet, then having two separate transformers may allow you to use two
different outlets so that you don't overload a single outlet. But then,
if you're going to need that much power, you should have a special power
outlet installed.

OK, so what will the difference be in using 2 (or 4) transformers compared
to one? I am building a 4-channel amp and yes I am looking for the best
sound quality.

I heard that its best to use one PSU for all 4 channels because not all four
are going to draw max power at once. This way the one channel has got more
power available when needed while the other channels is "idle"

B

#### Bob Masta

Jan 1, 1970
0
OK, so what will the difference be in using 2 (or 4) transformers compared
to one? I am building a 4-channel amp and yes I am looking for the best
sound quality.

I heard that its best to use one PSU for all 4 channels because not all four
are going to draw max power at once. This way the one channel has got more
power available when needed while the other channels is "idle"

There is some sense to the "max power" argument, but it always seemed
kind of lame to me. This kind of thing seems more appropriate for
low-end commercial stuff, where they are trying to shave every nickel.
It makes a whole lot less sense for an audiophile system. If you care
about sound quality, you won't be running the thing that close to the
rails in the first place. I think this is in the same category as the
old bit about tubes sound warmer than transistors when overdriven.
Yeah, so why would an audiophile be overdriving his system anyway?

So, I'd tend to go for the best sound for realistic listening.
If it clips a few watts lower, so be it. (If it makes a horrible
sound when it clips, so much the better for telling the user
to back off!)

If you are building a guitar amp, then that's a different matter.

Just my 2 cent's worth!

Bob Masta

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com

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