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Old 14th December 2009, 10:25 PM   #11
DougL is offline DougL  United States
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If you are wondering what the 40% taps are, perhaps this will help.
The Tube CAD Journal, Electrostatic Headphones Amps -Part 2-

In general, transformers can have unused taps without penalty. You can just leave them open without a problem.

Doug
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Old 15th December 2009, 06:10 AM   #12
Jeb-D. is offline Jeb-D.  United States
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Originally Posted by Ultima Thule View Post
Jeb, yeah I noticed the smaller core which could have been a good one regarding the input, but that frequency response looks a little bit freightening doesn't it?
It looks concerning, but I'm anticipating for the in-circuit frequency response to look much better.
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Old 6th January 2010, 07:26 PM   #13
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Anyone have any experience yet?

Trying to decide Antek vs Edcor vs Triode Elec.
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Old 6th January 2010, 09:30 PM   #14
Jeb-D. is offline Jeb-D.  United States
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I bought a couple power transformers, transformer pots and output transformers off of them. They keep stock on hand, so shipping is quick. Products seem well made, but unfortunately I haven't built anything with them yet.
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Old 6th January 2010, 10:12 PM   #15
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Originally Posted by Jeb-D. View Post
I bought a couple power transformers, transformer pots and output transformers off of them. They keep stock on hand, so shipping is quick. Products seem well made, but unfortunately I haven't built anything with them yet.
great, let us know when you are done!

I am thinking whether the UL OPT provides so much?
Or maybe I could get the non UL Antek with a more suitable p-p input impedance for the KT88 PP.

Cheers Michael
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Old 6th January 2010, 10:44 PM   #16
Jeb-D. is offline Jeb-D.  United States
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Will do.

I got the AT-040L. They are rated at 40W, but they seem really robust. I'm going to try and squeeze more power out of them (AB1 UL 6550 450V B+).
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Old 7th January 2010, 04:33 PM   #17
kevinkr is offline kevinkr  United States
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I can't talk to Antek OPTs, but I have been using their power transformers for a long time. (At least 6 - 7 yrs) I am a very pleased customer, inexpensive, quiet, cool running, and no trouble so far. (They're in my dac, and several of my amps, as well as client projects from years past.)

I've widely recommended them and no one I know has had any problems with them.

Quick and reasonable shipping, most everything is always in stock.
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Old 7th January 2010, 04:38 PM   #18
tomlang is offline tomlang  United States
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Be sure when you order to talk to John directly. I had to return the AT-040L's I ordered since they were so much physically bigger than the spec sheet indicates. In my case, I had tight physical tolerance so had to return them.

If you do a little looking on the site, many of the power transformers have two different physical dimensions depending on where you look. I have read of reports of some getting power supply transformers with wrong, i.e. 5vac instead of 6.3vac secondaries, etc.

Verify before ordering with John, that is all.
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Old 7th January 2010, 05:49 PM   #19
Jeb-D. is offline Jeb-D.  United States
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Originally Posted by tomlang View Post
Be sure when you order to talk to John directly. I had to return the AT-040L's I ordered since they were so much physically bigger than the spec sheet indicates. In my case, I had tight physical tolerance so had to return them.

If you do a little looking on the site, many of the power transformers have two different physical dimensions depending on where you look. I have read of reports of some getting power supply transformers with wrong, i.e. 5vac instead of 6.3vac secondaries, etc.

Verify before ordering with John, that is all.
I noticed some discrepancies between website dimensions and actual dimensions as well. But, I haven't started the chassis design yet, so it hasn't caused any problems. The 040L's do seem like a nice chunk of iron when you hold them in your hand. Which is why I'm going to try and squeeze 60W out of them
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Old 13th February 2010, 03:43 PM   #20
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I've been curious about these as well. The HF roll-off is a little steep on the smaller ones. The AT-070L looks the best on paper (what little paper they have). I'd mainly be curious about what the phase shift looks like over the frequency band in practice. Still, they look good at the bottom end and might be just the thing for a big, honkin' sweep tube amp. Could almost buy a pair of each size for the price of one Plitron set.
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