[lanchile]

Hi, I have a quick question, What is the VA on the transformers of the B60? I saw this before but I am not sure if they are 80va each. can someone confirm this please.

[rob80b]

Hi, I have a quick question, What is the VAC on the transformers of the B60? I saw this before but I am not sure if they are 80vac each. can someone confirm this please.

Hi Lanchile,

Without opening my B60 I was able to discern 120vac x 2 on the Plitron label through the side vents if that helps.
Although you could check the schematics on Bryston's web site.
http://www.bryston.com/pages/technical.html

Robert

[lanchile]

Thanks Robert for info ! I had a B60 before and I could see the spec from the side too. But I forgot what it was.

[rob80b]

Forgot I took this this shot when I installed the SST face plate.




Robert

[srb]

I'm not sure what is being asked here.  My first thought was that what lanchile really wanted to know was what the "VA" Volt-Ampere power output rating (similar to DC Watts) of the transformer is, not the AC input voltage of the primary windings, which would, of course, be 120VAC in North America and 240VAC in many locations outside of North America.

Steve

[rob80b]

Hi, I have a quick question, What is the VAC on the transformers of the B60?

Hi Lanchile,

Two of us are curious as to why you asked?

Robert

[FullRangeMan]

Forgot I took this this shot when I installed the SST face plate.




Robert

This image show that the input tension from the transformer, are intend to 120Volts in its two windings, it is not the Watts output capacity from the transformer.
Which I fell could be 100W each transformer by its size, but I can be wrong.

[rob80b]

Coincidentally Bryston  were doing a new face plate (baking didn't take on the original logo) for my 2BLP pro this week and I took this shot before I put the new one. The B60 and 2BLP basically share similar amplification and you can clearly see the output 2 x 30 VAC, so I believe this is what Lanchile actually needed.

[FullRangeMan]

Putz, just 60W. Iam wrong indeed.

[srb]

The B60 and 2BLP basically share similar amplification and you can clearly see the output 2 x 30 VAC, so I believe this is what Lanchile actually needed.

Again, the 2 x 30VAC is just the AC output voltage of the secondary windings based on the voltage requirement of the + and - rails (after rectification), but says nothing about the VA power capacity of the transformers.

In other words, you could have a 120VAC primary/30VAC secondary transformer with 100VA output power capacity or you could have a much larger 120VAC primary/30VAC secondary transformer with 1,000VA output power capacity.

But maybe lanchile just wanted to know the input/output voltages of the primary/secondary windings and not the power capacity, I don't know?

Steve

[FullRangeMan]

deleted

[rob80b]

Putz, just 60W. Iam wrong indeed.

But don't forget Brystons are always conservatively rated so you may be closer than you think!

[lanchile]

I'm not sure what is being asked here.  My first thought was that what lanchile really wanted to know was what the "VA" Volt-Ampere power output rating (similar to DC Watts) of the transformer is, not the AC input voltage of the primary windings, which would, of course, be 120VAC in North America and 240VAC in many locations outside of North America.

Steve

yes srb, I was looking for the va power capacity... I guess I need to multiply RMS power in 4 ohms to 1.41...in this case if is 100 watts RMS at 4 ohms it will be something like this 100x1.41= 141va transformer.  I build diy amps and i was just curius about how "overkill" is Bryston choosing transformers. since B60 does not go into 2ohms power I just went to 4 ohms power.

[srb]

Seems to me 30VA are 30W, so 30W+30W=60W.

No, "30VAC" is the secondary voltage of 30 volts AC, which has nothing to do with the VA power output rating.

As an example, here are 4 Plitron transformers from 300VA to 1000VA and all have the same 2 X 30VAC secondary windings:

300VA Power Transformer
Plitron#:  077017201
Output:  2 X 30VAC @ 5A
Dimensions: 110mm D X 57mm H
Weight:  2.9kg

500VA Power Transformer
Plitron #: 087017201
Output:  2 X 30VAC @ 8.33A
Dimensions: 135mm D X 63mm H
Weight:  4.5kg

750VA Power Transformer
Plitron #: 107060201
Output:  2 X 30VAC @ 12.5A
Dimensions: 150mm D X 80mm H
Weight:  5.5kg

1000VA Power Transformer
Plitron #: 117017201
Output:  2 X 30VAC @ 16.67A
Dimensions: 160mm D X 80mm H
Weight:  6.3kg

The VA power rating will be determined by the number of turns (the ratio of turns determines the ratio of input to output voltage, as in 120VAC in/30VAC out), the gauge of the wire and the diameter of the windings, and will be reflected in the size and weight of the transformer.

Steve

[rob80b]

Hi Lanchile

I did a test recently of running some 4 ohms Dynaudios with the 4BSST (500 watts per channel into 4 ohms), 3BST (200 watts 4 ohms), 2BLP (100 watts @ 4 ohms) and the amp section of the B60 (100 watts @ 4 ohms) while listening to music, all produced the same moderately loud levels at11 o’clock on the BP25 without audible distortion in my 10’ x 15’ room.
The big difference is with uncompressed dynamic peaks, I had the amp section of the B60 running my 4 ohm Dynaudio Contour 1.3MKIIs as surrounds and thought that was adequate while watching movies. And while everything sounded fine some DTS Master Audio tracks from the film would, without warning, cause audible distortion when the amp ran out of head-room, so over kill or not the bigger amps (transformers) just do it better, I now have the 3BST in its place.
There are other ways of getting around this depending on the design of the amp, though with Bryston one just needs to buy a bigger amp.

Robert

[lanchile]

Hi Lanchile

I did a test recently of running some 4 ohms Dynaudios with the 4BSST (500 watts per channel into 4 ohms), 3BST (200 watts 4 ohms), 2BLP (100 watts @ 4 ohms) and the amp section of the B60 (100 watts @ 4 ohms) while listening to music, all produced the same moderately loud levels at11 o’clock on the BP25 without audible distortion in my 10’ x 15’ room.
The big difference is with uncompressed dynamic peaks, I had the amp section of the B60 running my 4 ohm Dynaudio Contour 1.3MKIIs as surrounds and thought that was adequate while watching movies. And while everything sounded fine some DTS Master Audio tracks from the film would, without warning, cause audible distortion when the amp ran out of head-room, so over kill or not the bigger amps (transformers) just do it better, I now have the 3BST in its place.
There are other ways of getting around this depending on the design of the amp, though with Bryston one just needs to buy a bigger amp.

Robert

Well, first that is not a fair test.. 4B,3B,2B are different machines.(power)...That has nothing to do with VA power output raiting (transformer). if I "replace" those small transformers(original) of the B60 for 800va and increase capacitance to 80,000uf and stronger rectifiers now I will have a very hefty power supply right?, but...that does not mean with "stronger power supply" (not talking about increasing voltages on the secondaries) will get more power than before.(or in your case the 2B...samething)
What you heard in your test was the "clipping" of you 2B

[rob80b]

What you heard in your test was the "clipping" of you 2B

Exactly (but it was the B60, same difference), but I'm just an end user so I'll let yourself and srb work out the details.

Robert

[FullRangeMan]

No, "30VAC" is the secondary voltage of 30 volts AC, which has nothing to do with the VA power output rating.

As an example, here are 4 Plitron transformers from 300VA to 1000VA and all have the same 2 X 30VAC secondary windings:

300VA Power Transformer
Plitron#:  077017201
Output:  2 X 30VAC @ 5A
Dimensions: 110mm D X 57mm H
Weight:  2.9kg

500VA Power Transformer
Plitron #: 087017201
Output:  2 X 30VAC @ 8.33A
Dimensions: 135mm D X 63mm H
Weight:  4.5kg

750VA Power Transformer
Plitron #: 107060201
Output:  2 X 30VAC @ 12.5A
Dimensions: 150mm D X 80mm H
Weight:  5.5kg

1000VA Power Transformer
Plitron #: 117017201
Output:  2 X 30VAC @ 16.67A
Dimensions: 160mm D X 80mm H
Weight:  6.3kg

The VA power rating will be determined by the number of turns (the ratio of turns determines the ratio of input to output voltage, as in 120VAC in/30VAC out), the gauge of the wire and the diameter of the windings, and will be reflected in the size and weight of the transformer.

Steve

OK, thanks for find how calculate trafos wattage, it is a interesting process.