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Old 13th October 2011, 11:09 PM   #21
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Quote:
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Great stuff but Bud doesn't do a line of ready made SE iron, does he?
He has at least a couple (fortunately 2.5-3.5 reflected impedance covers a lot of ground). I suspect you could get a Level 1 out of stock (that is all we have been able to afford). Level 2 & 3 are likely special order.

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Old 15th October 2011, 07:33 AM   #22
Ian444 is offline Ian444  Australia
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With high-end OPT's, you will need high-end source and speakers to get the full benefit, it is a law of diminishing returns. But if you can afford high-end OPT's now, you will probably keep them for a long time, which makes them cheap in the long run.
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Old 15th October 2011, 03:26 PM   #23
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............... Hashimoto H-30 c-core is on the top of my list at the moment, after reading that newer tango is being manufactured in... china?!
may i know where did u read this?
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Old 15th October 2011, 06:12 PM   #24
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i read it on this forum through some arbitrary search. let me try to dig it up again.

oh gosh, what a grave mistake i would have made. i confused between tamura and tango... :P (#83)
Lineup of four: Help me choose?! OPT for SE

but here's another user talking about iso tango being chinese core (#44)
Lineup of four: Help me choose?! OPT for SE

Last edited by PreSapian; 15th October 2011 at 06:19 PM.
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Old 15th October 2011, 06:26 PM   #25
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I did not answer this post at first since I assumed that it was all about transformers that were all beyond my budget. Now that the thread has ventured into familiar territory I can say that I tend to use "budget" OPT's but I have a set of custom Electra Print 5K:8 "10 watt" OPT's in my Tubelab SE. I run that amp wih 45's or 300B's and it is the best sounding amp I have built. It has been auditioned along side some rather expensive amps with favorable results. I got the Electra Prints so long ago that they were $100 each.

I have another Tubelab SE running triode wired 307A's that uses the large Edcors. It sounds nice, but is not as detailed as the Electra Print amp with 45's in it.
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Old 16th October 2011, 03:07 AM   #26
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Quote:
Originally Posted by PreSapian View Post
i read it on this forum through some arbitrary search. let me try to dig it up again.

oh gosh, what a grave mistake i would have made. i confused between tamura and tango... :P (#83)
Lineup of four: Help me choose?! OPT for SE

but here's another user talking about iso tango being chinese core (#44)
Lineup of four: Help me choose?! OPT for SE
i think the Chinese OEM did a great job. i am impressed quite a few amps that uses the Tango irons so far.
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Old 16th October 2011, 03:28 AM   #27
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I am partial to One-Electron OPTs.....After taking apart several TX laminations it just seems the O-E has the right dimensioned stacks......its something I just cant put my finger on.????



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Old 16th October 2011, 04:02 AM   #28
smbrown is offline smbrown  United States
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One Electron has been around for years but I've never tried one. I guess I should. Don't know why I've avoided them. Have others had good luck with them?
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Old 16th October 2011, 01:40 PM   #29
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Quote:
One Electron has been around for years but I've never tried one.
I bought a pair of UBT-3's several years ago. They are not bad OPT's and do sound quite good. They however have a higher DC resistance than most OPT's of similar size. This will lower the efficiency reducing the output power by about 5% compared to other OPT's in the class. The higher DCR will help damp out resonances and may have been intentional.

I can also state that my pair have been kicking around the workbench as test transformers for about 5 years, although they are kept in the original boxes when not in use. The laminations have developed a very light case of surface rust. This is not present on any other recently (5 years or less) purchased transformers in my lab. Some of the vintage stuff is quite rusty, but it came here that way.
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Old 16th October 2011, 02:52 PM   #30
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is there a certain giant killer that compares favorably to japanese top dogs for much less money? i know the law of diminishing return is in full effect where i'm about to tread... but i would rather spend all my budget now on a component that will last indefinitely, than deal with the future upgrades and the constant wonderment how it could've sounded meanwhile...

for that my OCD mind is still pledged to hashimoto h30-3.5k
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