amorphous iron core good or not

nhuwar · 24th April 2007, 07:35 PM

I just finally bought my output xfmr's for my push pull amp. I got the amorphous core's the lundahl ll9202am and am kind of worried if I jumped the gun or not.

Are the amorphous core as good as they say they are?

Thanks

Nick

Tweeker · 24th April 2007, 07:38 PM

Law of diminishing returns comes into play here, but your already in hundreds dollars for vanilla Lundahls...

The OPT is the heart of your amp.

ak_47_boy · 24th April 2007, 07:39 PM

Some like amorphous cores, some like vintage EI. It all sounds great, it just has different character. Amorphous core trannys give very nice high ranges.

nhuwar · 24th April 2007, 07:45 PM

I was just worried I fell victim of marketing.

Nick

Tweeker · 24th April 2007, 07:48 PM

Less hysteresis and eddy current losses for amorphous core, these losses go up with frequency.

nhuwar · 24th April 2007, 07:53 PM

Well I think that it was a better buy in my case sense I'm using a fairly impedence tube.

Nick

kmtang · 25th April 2007, 01:51 PM

I believe amorphous iron core OPT's are good. Why don't you build the amp with it and try it out yourself.

If you don't like it, sell them on Ebay.

Johnny

cyl · 25th April 2007, 03:45 PM

According to the Tamura transformer catalog. http://www.tamura-ss.co.jp/catalog/pdf/C-1005-13.pdf
F7001 is Permalloy cores and F5002 is Amorphous core. They are both 3K, 8W.

Check the selling price in here. http://www.hino-audio.co.jp/03/tamura.html
F7001 is 38120 yen. F5002 is 58260 yen.

Can the price tell you the different?
Also the frequency response, F7001 is 15-60K. It is pretty good. F5002 is 10-100K. F5002 is a well known the best transformer for 300B. So, I think Amorphour cores is better. My main concern is lundahl can handle this new material good or not.

cyl · 25th April 2007, 05:01 PM

According to the Tamura transformer catalog. http://www.tamura-ss.co.jp/catalog/pdf/C-1005-13.pdf
F7001 is Permalloy cores and F5002 is Amorphous core. They are both 3K, 8W.

Check the selling price in here. http://www.hino-audio.co.jp/03/tamura.html
F7001 is 38120 yen. F5002 is 58260 yen.

Can the price tell you the different?
Also the frequency response, F7001 is 15-60K. It is pretty good. F5002 is 10-100K. F5002 is a well known the best transformer for 300B. So, I think Amorphour cores is better. My main concern is lundahl can handle this new material good or not.

kstagger · 25th April 2007, 07:07 PM

slightly different application - but my RAKK DAC uses a Lundahl LL1674 Amorphous line transformer - I've been very pleased with the sound.

24th April 2007, 07:35 PM	#1
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	amorphous iron core good or not I just finally bought my output xfmr's for my push pull amp. I got the amorphous core's the lundahl ll9202am and am kind of worried if I jumped the gun or not. Are the amorphous core as good as they say they are? Thanks Nick

24th April 2007, 07:38 PM	#2
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Law of diminishing returns comes into play here, but your already in hundreds dollars for vanilla Lundahls... The OPT is the heart of your amp. __________________ Be sure your foil hat has a good low impedance ground.

24th April 2007, 07:48 PM	#5
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Less hysteresis and eddy current losses for amorphous core, these losses go up with frequency. __________________ Be sure your foil hat has a good low impedance ground.

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24th April 2007, 07:39 PM	#3
ak_47_boy diyAudio Member Join Date: Sep 2006	Some like amorphous cores, some like vintage EI. It all sounds great, it just has different character. Amorphous core trannys give very nice high ranges.

24th April 2007, 07:45 PM	#4
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	I was just worried I fell victim of marketing. Nick

24th April 2007, 07:53 PM	#6
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Well I think that it was a better buy in my case sense I'm using a fairly impedence tube. Nick

25th April 2007, 01:51 PM	#7
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	I believe amorphous iron core OPT's are good. Why don't you build the amp with it and try it out yourself. If you don't like it, sell them on Ebay. Johnny

25th April 2007, 03:45 PM	#8
cyl diyAudio Member Join Date: Jul 2006	According to the Tamura transformer catalog. http://www.tamura-ss.co.jp/catalog/pdf/C-1005-13.pdf F7001 is Permalloy cores and F5002 is Amorphous core. They are both 3K, 8W. Check the selling price in here. http://www.hino-audio.co.jp/03/tamura.html F7001 is 38120 yen. F5002 is 58260 yen. Can the price tell you the different? Also the frequency response, F7001 is 15-60K. It is pretty good. F5002 is 10-100K. F5002 is a well known the best transformer for 300B. So, I think Amorphour cores is better. My main concern is lundahl can handle this new material good or not.

25th April 2007, 05:01 PM	#9
cyl diyAudio Member Join Date: Jul 2006	According to the Tamura transformer catalog. http://www.tamura-ss.co.jp/catalog/pdf/C-1005-13.pdf F7001 is Permalloy cores and F5002 is Amorphous core. They are both 3K, 8W. Check the selling price in here. http://www.hino-audio.co.jp/03/tamura.html F7001 is 38120 yen. F5002 is 58260 yen. Can the price tell you the different? Also the frequency response, F7001 is 15-60K. It is pretty good. F5002 is 10-100K. F5002 is a well known the best transformer for 300B. So, I think Amorphour cores is better. My main concern is lundahl can handle this new material good or not.

25th April 2007, 07:07 PM	#10
kstagger diyAudio Member Join Date: Dec 2003 Location: Grand Rapids	slightly different application - but my RAKK DAC uses a Lundahl LL1674 Amorphous line transformer - I've been very pleased with the sound.

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