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Old 23rd January 2009, 03:58 PM   #1
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Default Edcor OPT Voltage Rating?

Hi, just wondering if anyone has torture-tested Edcor's line of 25W enclosed SE transformers, or heard from anyone else about their voltage/current rating on the primary.

The representative I emailed said 403V, but I'm pretty sure it's got to be more than that. I just don't see how you could feasibly get 25W out of one of those OPT's at 400V.

I'm looking to use a couple of the 6.5K:8 ones for a GM70 project, with about 900V on the B+, and 100-110mA.

Thanks!
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Old 23rd January 2009, 04:21 PM   #2
Jeb-D. is offline Jeb-D.  United States
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Edcor is a very flexible company and handles business in an old-school manner. It's best to contact them by phone and discuss your needs vs. what they have on file. I have purchased several standard and custom pieces from Edcor and found them to be very accommodating.

They usually build by order regardless of if your buying standard line-up or custom. They also have several designs on file that are not on their website. Expect a 1-3 week turn around.

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Old 23rd January 2009, 04:29 PM   #3
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There was a recent discussion at the GM70 yahoogroup about output transformers for transmitting tubes. Also the Edcor's passed the revue, and one of the members said he heard from an Edcor technician who said that the 25W units could handle 1500VDC.

talk to them, ask them what it would cost to have them winding you a larger unit. It seems a bit of a waste having a potential 40-50W of power and only being able to use half of that due to core limitations. I know you are probably doing this more to show it can be done, and not really care about the output power being limited, but I thought I would say it anyway.
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Old 23rd January 2009, 04:56 PM   #4
Jeb-D. is offline Jeb-D.  United States
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Quote:
It seems a bit of a waste having a potential 40-50W of power and only being able to use half of that due to core limitations
Isn't typical output 30-35W for a single GM70 tube SE?
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Old 23rd January 2009, 04:59 PM   #5
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Actually I think you are right, I am just trying to make the situation somewhat more dramatic
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Old 23rd January 2009, 05:12 PM   #6
Jeb-D. is offline Jeb-D.  United States
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The 25W transformer could probably be pushed 5W past it's rating and still have decent bandwidth. Edcor usually sizes its cores on the larger side.
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Old 23rd January 2009, 05:18 PM   #7
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Another + for EDCOR!!
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Old 23rd January 2009, 06:49 PM   #8
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Just in case anyone doesn't know, Edcor has their own forums where they are happy to answer questions:

Edcor Forums
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Old 23rd January 2009, 11:18 PM   #9
nhuwar is offline nhuwar  United States
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I have heard they can only take 500 vdc. I asked a tech there and that is what I was told. I wanted to use on e for a se 813 amp.

Nick
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Old 26th January 2009, 07:37 PM   #10
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I just heard back from Edcor about one specific CXSE (the 25 watt SE OPT's), which is rated for 1KV. I suppose that at lower impedances (this one is 8K:8), lower voltage/higher currents would be needed to get a specific wattage, but this bodes well for my project.
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