Nice amp idea.

i was browsing the several thousands of pics that i have saved from the internet and i came across this folder that had a few of these pics in it i have 5 of them of difrent angles and from start to finnish does any one know what kinda amp this is or if it is diy it looks realy nice and some one put lots of work into it.
 

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From what I can see from the web site it's a 500 watt into 8 Ohm design. and the module is driven off +-95 volt rails.
Only 5 IRFP240 and 5 IRFP9240 devices.
I think once again a design which is very optimistic with how much power you can get from only 5 devices per voltage rail.
Some what over driven I think.... I would not like to run this amplifier at near maximum power on a continous basis.


Anthony Holton
Aussieamplifiers
 
It has no effect what so ever on the magnetic field. If you wish to make the transformer quieter. enclose the transformer in a faraday cage or just a sheet steel box, but be sure not to short out the mounting bolt to the top of the box, as this will create a shorted turn cross the toroidal core.
This method helps to keep the magnetic field, within the enclosure. The thicker the sheet steel the better.

Regards

Anthony Holton
Aussieamplifiers:)
 
Yep,

I heard those Thel's at Jan's place (after he showed me the inner work and made an afwul scratch on the dinner table (wife said anything ??))

They sounded really nice, although I'm not familiare whith other setups using this amp. But something must be lacking otherwise you would be making an ALEPH5 ;)

Ralph
 
The Saint said:
It has no effect what so ever on the magnetic field. If you wish to make the transformer quieter. enclose the transformer in a faraday cage or just a sheet steel box, but be sure not to short out the mounting bolt to the top of the box, as this will create a shorted turn cross the toroidal core.
This method helps to keep the magnetic field, within the enclosure. The thicker the sheet steel the better.

Regards

Anthony Holton
Aussieamplifiers:)

What do you mean by this. I'm planning to mount 2 transformators on to of each other with a sheat of mu-metal between them. They will be bonded to the baseplate with one m8 rod right thru the core.

Can I do this??

Ralph
 
The Saint said:
From what I can see from the web site it's a 500 watt into 8 Ohm design. and the module is driven off +-95 volt rails.
Only 5 IRFP240 and 5 IRFP9240 devices.
I think once again a design which is very optimistic with how much power you can get from only 5 devices per voltage rail.
Some what over driven I think.... I would not like to run this amplifier at near maximum power on a continous basis.

I don't think 5 pairs are too optimistic (for home use) but the cooling arrangements are. The L-profile is "skinny". Can't transport much heat.

Anthony, I like your heatsink for your 1 kW amp! :up:
http://www.aussieamplifiers.com/1kwamp.htm
 

Bobken

Member
2002-12-23 11:22 pm
UK
rwagter said:


What do you mean by this. I'm planning to mount 2 transformators on to of each other with a sheat of mu-metal between them. They will be bonded to the baseplate with one m8 rod right thru the core.

Can I do this??

Ralph

Yes, that should be fine, provided you avoid the shorted-turn situation which has been mentioned.

I have a power amp which has two torroids, one sitting on top of the other with only the usually supplied metal (plated steel) disk, which is used for clamping these transformers, between the two.

I simply soldered (actually brazed, for safety) a nut on top of the head of the 'lower' bolt, and then used this bolt (with the soldered on nut at the top) and secured the 'lower' transformer from underneath the chassis with another nut and lock washer.

This left me with the lower transformer secured satisfactorily and with the usual steel disk at the top of it, and with a short threaded 'socket' (the nut attached to the top of the lower bolt) in the middle.

On top of this, I placed the usual (rubber) anti-vibration washer, followed by the second transformer together with its top cap and rubber washer etc., and secured this with a bolt cut to the correct length, which seated into the nut left at the top of the lower assembly.

This way gives some adjustment in securing the two transformers, which I like to have as this can affect sonics in equipment where the transformer(s) is in the same case as the electronics.

I have found in various bits of equipment, that poor sound due to vibration can be reduced by carefully backing off the tension on securing bolts of transformers, although, if one needs to transport the gear for any reason, they should be tightened up again sufficiently to prevent any likely movement of the heavy transformers.

I have had no problems with this arrangement of two torroids in use for about 15 years now.

Regards,
 
Christian said:
What are does small xformers for?

/Christian V

Hi!

Those small toroids power the driver transistors seperately, like it also can be done with LCAudio's End Millenium Amp kit. It should provide an even better control of the music and gives slightly higher output power.

As for those blue toroids from Thel (actual versions are grey):

They are not fitted into simple plastic buckets, those are magnetically shielded buckets, so this means less influence on other parts of the amp... These toroids fulfill some of the hardest industrial standards, including medical and military ones...

Ciao,

Arndt
 
Well, first about the scratch in our table. We knew when we bought this table it was going to be scratched although we did not expected it to be scratched by an amplifier:bigeyes:
Now we are the first family in the world with an official amplifier scratched table:cheerful: This table will be sold at Christy's when I'm dead:boggled:

Now about the amp! It is hard for me to compare this amp with any other amps. The amps I owned before are totally nothing compared with this amp (A Yamaha-ha-ha 100W integrated and a Rotel RB-970 100w Power amp). The amp I have delivers about 275 Watt's into an 8 ohm load. It was my intention to use it with diy elecrostatic loudspeakers so I needed something powerfull. This amp has all the power you ever want. I think it sounds great on my speakers (Alcone Fourier design with Dynaudio d-260 Esotec tweeters). The amp doesn't get hot in whatever kind of torture I put it through. According to me it is a very neutral amp.

I'm also using the thel pre amp, but I have an older version.

In the future I want to build a tube active x-over and use the Thel's for my low pass en my (under construction) Aleph 5 for the high pass.

If there is anything some would like to know about these amps (or my table), just ask and maybe I can answer your question.

Greetings
Jan