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Old 24th April 2007, 07:35 PM   #1
nhuwar is offline nhuwar  United States
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Default 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?


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Nick
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Old 24th April 2007, 07:38 PM   #2
Tweeker is offline Tweeker  United States
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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.
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Old 24th April 2007, 07:39 PM   #3
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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.
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Old 24th April 2007, 07:45 PM   #4
nhuwar is offline nhuwar  United States
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I was just worried I fell victim of marketing.

Nick
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Old 24th April 2007, 07:48 PM   #5
Tweeker is offline Tweeker  United States
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Less hysteresis and eddy current losses for amorphous core, these losses go up with frequency.
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Old 24th April 2007, 07:53 PM   #6
nhuwar is offline nhuwar  United States
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Well I think that it was a better buy in my case sense I'm using a fairly impedence tube.

Nick
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Old 25th April 2007, 01:51 PM   #7
kmtang is offline kmtang  Canada
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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
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Old 25th April 2007, 03:45 PM   #8
cyl is offline cyl  Hong Kong
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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.
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Old 25th April 2007, 05:01 PM   #9
cyl is offline cyl  Hong Kong
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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.
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Old 25th April 2007, 07:07 PM   #10
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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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