Audio Power Transformers

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Stefanoo

Stefanoo

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Joined 2006
#1
Hi all,

I am trying to find a 2KVA 30V output secondaries with rough dimensions:

200mm (D) X 90mm (H)

Is there any valid alternative to Plitron here in the states? They have a beautiful low noise power transformer with the electrical specs I need but size is huge which won't fit on the enclosure I got.
I am looking for an alternative that is going to be just as good quality as the Plitron.
There is no real cost object restriction, obviously preferable not more expensive than the $800 each asked for the huge plitron...I am more interested in the quality of the product.

Thanks all for your advice.
 
#6
No, the 2KW Power transformer from Plitron is extremely big.
I attach the link here to the specific unit I am referring to for the kick (look at weight):

http://shop.plitron.com/specs/739800.pdf

This is a beast that won't easily find a home 🙂
Maybe it is because it is potted and put inside a metal can, don't know! I like massive things and if I had the real estate to place it I would certainly do, also given the high quality products plitron makes!

Hammond is nice, but it seems they don't have anything for 2KW @30V.
Is it possible that here in America, there is ONLY Plitron that makes good power transformers available off the shelf?


Any other input is very welcome.
 
#7
Do you seriously NEED a 2kVA transformer? If something more like a 1.5kVA will do then look towards the 'standard' series for ones that are not potted in a can. They will still be pretty big, but thats physics for ya.

You can also check out AnTek to see if they offer something that will work for you.
 
#9
2KW is an estimate based on the 1.5/2 times rated power.
The amp I am making with the help of a dear friend of mine who is doing all the design work (to be honest with you 🙂 ), is going to be 200W Class A @8ohm 400W peak Class A.
So total power disspation per monoblock will be around 800W so technically a 1.5KW would be fine, however a 2KW would be very desirable.

Let me check the option listed here.
 
#14
Stefanoo said:
This is a balanced/X'ed amp.
i feel 32V will produce probably too much heat and I would have to back down some class A!
I think 30V is an ideal value (I am pretty sure the XA200.5 uses no more than 30V)
Click to expand...

if you are THAT close regarding heatsink performance. then dont do it🙂
what happens if your mains og up?
the antek trafo delivers 32V with 120V mains. With 115V mains it delivers 30.6V. most transformers is measured at 115V. plitron transformers are one of those. so if your mains goes up to 120V, then that one to will give you around 32V. so all in all. antek's 32V transformers will give you the same voltage as plitron 30V transformers🙂
EDIT: you may be better off with a 25V sec transformer.
 
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#15
Stefanoo said:
2KW is an estimate based on the 1.5/2 times rated power.
The amp I am making with the help of a dear friend of mine who is doing all the design work (to be honest with you 🙂 ), is going to be 200W Class A @8ohm 400W peak Class A..........
Click to expand...
1.5 or 2times is for a ClassAB amplifier.
For a ClassA amplifier the transformer is typically 6 times to 10times the maximum ClassA output.
i.e. for a 200W of ClassA use a transformer of 1200VA to 2000VA.

But, you should check the continuous current rating of the transformer when feeding the type of rectifier/smoothing you intend using.
 
#17
AndrewT said:
1.5 or 2times is for a ClassAB amplifier.
For a ClassA amplifier the transformer is typically 6 times to 10times the maximum ClassA output.
i.e. for a 200W of ClassA use a transformer of 1200VA to 2000VA.

But, you should check the continuous current rating of the transformer when feeding the type of rectifier/smoothing you intend using.
Click to expand...

yes that' what I meant though 🙂 thank you for the detailed explanation!
 
#18
sajti said:
There is a company in my country which can made 2kVA toroidal with 198*82mm size, but I don't know if they deliver outside of the country.

Sajti
Click to expand...

I know there are very nice manufacturers in Europe. One of the companies I have used with great pleasure in the past was Tororidy!
I guess that I would just like to deal with US manufacturer if possible, to avoid big and long time shipping and custom fees!
 
#19
AudioSan said:
if you are THAT close regarding heatsink performance. then dont do it🙂
what happens if your mains og up?
the antek trafo delivers 32V with 120V mains. With 115V mains it delivers 30.6V. most transformers is measured at 115V. plitron transformers are one of those. so if your mains goes up to 120V, then that one to will give you around 32V. so all in all. antek's 32V transformers will give you the same voltage as plitron 30V transformers🙂
EDIT: you may be better off with a 25V sec transformer.
Click to expand...

That's a very interesting thought!!! Let me think about it!
 
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