Favorite transformers for chip amp and gainclone?

[wboyd]

Well....just for the sake of not arguing and getting back to the original subject...I have had very good luck with this company - www.antekinc.com. In my last gainclone I used a fairly large 400VA toroid with dual secondaries and it is dead quiet....and is now one of my "reference" amps.

I would love to try an R-Core, but have not really found any that were reasonable (price wise) or "up to-snuff".

[danielwritesbac]

Sound versus power = apples and oranges consideration.
They weren't disagreeing on anything except the method used to measure resonance.

It seems that a lot of people enjoy the resonance of the bigger 300va and 400va transformers for unregulated linear power supplies, especially with, but not exclusive to, the gainclone styles.

[paulb]

Originally posted by danielwritesbac
It seems that a lot of people enjoy the resonance of the bigger 300va and 400va transformers for unregulated linear power supplies, especially with, but not exclusive to, the gainclone styles.

Can you define what you mean by "resonance" of a transformer?

[ratza]

Originally posted by wboyd
Well....just for the sake of not arguing

Nobody is arguing. I just said that is better to have a power reserve, even if it's double that you need

[wboyd]

Point taken....I do understand....but I have seen some heated debates here in the forums...usually over small differences of opinion.

[danielwritesbac]

Originally posted by paulb

Can you define what you mean by "resonance" of a transformer?

Um. . . No, not really.
But, I'll try it just for fun.

Even after rectification, there's no such thing as perfect DC. The source of it always has a size. This rings exactly like a wind chime works. That is a resonance. Each different size has a different resonance. Choose one that's pleasant for your application.

You can calculate a zobel for a transfomer exactly like you would calculate a zobel for a woofer. Both a speaker driver and a transformer have a copper coil around either metal or a magnet. The same caveats and calcuations apply as they would to any inductor.

You can alter the resonance with a power supply board if you had one--but since a "gainclone" (meaning, the style of 47 labs) doesn't have a power supply board, then the transformer selection becomes more important.

In contrast, observe the series resistors in the carlosfm power supplies (and many others). These can use much smaller transformers with quite good results. The resistor has created a pole. This changes the resonance of the power circuit. But that's not a gainclone style anymore.

That's almost as far out on a limb as I'm able for at the moment.

[danielwritesbac]

Originally posted by wboyd
Well....just for the sake of not arguing and getting back to the original subject...I have had very good luck with this company - www.antekinc.com. In my last gainclone I used a fairly large 400VA toroid with dual secondaries and it is dead quiet....and is now one of my "reference" amps.. . .

Hi. I'm wondering if that's Antek's AN-4255 (pair 25ac sec) or their AN-4222 (pair 22ac sec)? Those look nice. Wow. Big.

The 2.7" x 5" sort of puts an end to my theory about the Stancor NV being too big at 3.5" x 4" x 4". The Toroid requires clearance on the top for an air gap, in order to avoid the shorted turn phenomena, wheras there's no such requirement for the EI. There was actually no difference in the required size for the amplifier enclosures. Now, I feel so silly for complaining about that.

[MJL21193]

Originally posted by danielwritesbac


Um. . . No, not really.
But, I'll try it just for fun.

Originally posted by danielwritesbac

Even after rectification, there's no such thing as perfect DC. The source of it always has a size. This rings exactly like a wind chime works. That is a resonance. Each different size has a different resonance. Choose one that's pleasant for your application.

Originally posted by danielwritesbac

You can calculate a zobel for a transfomer exactly like you would calculate a zobel for a woofer. Both a speaker driver and a transformer have a copper coil around either metal or a magnet. The same caveats and calcuations apply as they would to any inductor.

Originally posted by danielwritesbac

You can alter the resonance with a power supply board if you had one--but since a "gainclone" (meaning, the style of 47 labs) doesn't have a power supply board, then the transformer selection becomes more important.

!

Originally posted by danielwritesbac

In contrast, observe the series resistors in the carlosfm power supplies (and many others). These can use much smaller transformers with quite good results. The resistor has created a pole. This changes the resonance of the power circuit. But that's not a gainclone style anymore.

!!

Originally posted by danielwritesbac

That's almost as far out on a limb as I'm able for at the moment.

[danielwritesbac]

I has an "A" ?

[Soxen]

I recommend these guys in the UK, extremely proffessional and fast, will build a transformer at your own specs and at a very reasonable price.

I have had 2 toroids built for a Class A project They are centerpotted and with a steelband screen the absolute best transformers I've seen dead quit.

I have tried them out with my Dual mono GC's performing outstanding....

Airlink Transformers