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Old 16th August 2006, 06:07 PM   #1
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Default One Electron vs. Transcendar

I'm busy collecting iron for a series of tube amp proquects, and am looking at a pair of 3k output transformers for use with a SE amp using a triode connected 6550. I've narrowed things down to the One Electron 3k transformer and the Transcendar "300B" 3k. Any comments pro or con?
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Old 16th August 2006, 06:13 PM   #2
vax9000 is offline vax9000  United States
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here,
Trancsendar Transformers
here,
transcendar transformer
and more here, http://www.diyaudio.com/forums/searc...der=descending
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Old 16th August 2006, 08:02 PM   #3
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Good data points, though I was hoping for some others. If I were to make the decision solely on price, it would be the Transcendars, hands down. I might consider the more expensive Edcors, too.
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Old 16th August 2006, 08:14 PM   #4
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Edcors have only one set of taps, which will make you choose a Secondary impedance to stick with. and also a primary impedance, Transcendar lets you pick different impedance taps. It just seems more practical to me. I would have orderd a pair already, were i not moving in two weeks.

-Alex
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Old 16th August 2006, 10:58 PM   #5
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Hi, checking in for the first time an a week, on a borrowed slow dial up in rural West Virginia. Im leaving for the trip south tomorrow, so I may not be on for a few more days unless I find a hotel with free internet.

You probably know my story on this, but I will repeat it. I ran a listening test with these two transformers about a year ago. With 5 testers, all of whom owned tube amps, no one could reliably tell these two transformers apart. Some listeners could tell them from the Electra-Prints, but it was not a fair test since the Electra-Prints were 5K and the others were 3K. I liked the Transcendars enough to buy 10 pairs of them. Most of them reside in customers 300B amps now. I have had them in my SimpleSE, and they do sound nice, but the Hammond 1628SE's have far more bass. The Hammonds are twice as big as the other two. I will be testing the new 1628SEA's when I get back.

The Transcendars have 4 and 8 ohm taps, while the One Electrons have 4, 8, and 16 ohm taps if that makes a difference.

There is a page on my web site outlining these tests, but I can't find it now. This computer will only open one window at a time.
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Old 16th August 2006, 11:57 PM   #6
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Tubelab, your test results have been pointed out - thanks. I was looking for some more data points, though I'll probably get the Transcendars on grounds of cost. I consider ordering the Hammond 1628s to be a cra* shoot at this point until the old transformers are flushed out of the system.

The "expensive" Edcor SE transformers are interesting in that they are offered down to a really low primary impedance. This may make it possible to do a monster SE enhanced triode sweep tube amp using a fairly low B+ voltage. That's an experiment for the future, as I have more projects than I can handle as it is:

1) 6CD6GA SE enhanced triode - in progress using Hammond 125ESE outputs. Awaiting final circuit check and first AC power-up.

2) 6GF7A SE with switchmode supply - in progress using Hammond 125CSE outputs. The switcher is done - next step is to start drilling all the holes for the tube sockets, transformers, terminal strips, etc.

3) 6GF7A push-pull (will configure chassis on the 6GF7A SE project so I can try this fairly quickly) I have cheap Edcor 8K 10W XFMRs for this one.

4) 7591A P-P using old Fisher iron and EH output tubes.

5) 6HV5A SE - I'm leaning strongly toward using 700V B+, A2 mode and paralleled output tubes for this one, using the 5K Transcendar transformers I bought a while ago. I was thinking of using >1k B+ and 10k output transformers, but I decided I wanted to die of old age... Matching the 6HV5As should be interesting - I don't even know if my tester will handle them. Even in A2 mode, the drive requirements for the 6HV5As should be pretty low, so I am thinking of using a 6CM7 for preamp/follower drive.

6) 807/1625 SE Ultralinear - I have the cheap Edcor 5k iron for this one. This one may move up in priority if I chance across an inexpensive chassis of the right size.

7) 6550 triode strapped SE - this one will use the 3k output transformers mentioned above.
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Old 17th August 2006, 07:57 AM   #7
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I just nailed down a pair of the 3k Transcendars, so now the question is moot...
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Old 17th August 2006, 05:36 PM   #8
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Woo! go you!

Let us now how it works out
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Old 18th August 2006, 11:10 PM   #9
kevinkr is offline kevinkr  United States
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I am using a pair of 3K Transcendars in my 2A3 based Loftin-White derivative.. I'm very pleased with the overall performance and the bass performance is very good too.
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Old 23rd August 2006, 03:30 AM   #10
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wrenchone, I wish I had time for that many experiments. I have been down these roads, or ones close to them, so I will relate my experiences.

7) 6550 triode strapped SE - this one will use the 3k output transformers mentioned above.

I have put 6550's in the SimpleSE and tried them in triode and UL mode with several transformers. Triode works well with the One Electron or the Transcendar (hard to tell them apart). I have used Sovteks and NOS GE's the GE's really rock but they are expensive.

6) 807/1625 SE Ultralinear - I have the cheap Edcor 5k iron for this one. This one may move up in priority if I chance across an inexpensive chassis of the right size.

I tried 6L6GB's in the same amp with the $18 Edcors. I preferred the ability of 6L6GC's to dissipate more power, and thus handle more current.

5) 6HV5A SE - I'm leaning strongly toward using 700V B+, A2 mode

I only have 2 of these. I wired them into a TubelabSE, but I only had 400 volts of B+. I couldn't get them to draw enough current to make any power. That amp couldn't do positive grid voltage.

4) 7591A P-P using old Fisher iron and EH output tubes.

I have an old Fisher receiver that uses 7591's. I played with it for a while, but wound up stealing the tubes for my old Guild guitar amp.

2) 6GF7A SE with switchmode supply

Tried 6EM7's and 6DN7's. Not enough power for my wimpy 86db speakers. maybe 1.5 watts. Tell us more about the SMPS though.

I just got back from a 3000 mile road trip. There is a pair of the new Hammond 1628SEA's waiting for my attention. Unfortunately when I got to work today, I found out that the test IC's that we sent out came back early (never happens) so I must spend the next month evaluating them. I will try to test the transformers this weekend.
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