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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 4th July 2012, 03:19 AM   #11
zman01 is offline zman01  Bangladesh
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Join Date: Feb 2011
Location: Dhaka
Default Working voltage vs VDC

Using Google I came across a couple of links where it says that insulation test voltage is 2 x working voltage + 1000 volts - one of these from diyAudio:

Post #7 on this diyAudio thread: 813 amp and old choke

I am not sure if this is case for all chokes. A couple of other documents indiciated that VDC should be 1.4 times VRMS. Again, the Edcor choke on my shortlist is rated for working voltage of 1000 VRMS according to an e-mail from Edcor.

The Edcor power transformer I have in mind is this one: EDCOR - XPWR002-240, which is 720V rated (360-0-360).
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Old 5th July 2012, 04:19 PM   #12
diyAudio Member
Join Date: May 2010
Location: South East USA
I asked Transcendar this very question about the TT-010-CH. Here is their response:


I don't normally rate inductors for a voltage.
They are rated for current and inductance.
However, I do test the insulation of each inductor to withstand 3000 volts DC.


I purchased this unit, and have it in place on my 300B Tubelab SE.
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Old 5th July 2012, 05:28 PM   #13
zman01 is offline zman01  Bangladesh
diyAudio Member
Join Date: Feb 2011
Location: Dhaka
Good info acceler8, thank you.

I have asked Edcor the same question.

Does Transcendar make power transformers?
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Old 10th July 2012, 10:52 PM   #14
zman01 is offline zman01  Bangladesh
diyAudio Member
Join Date: Feb 2011
Location: Dhaka
Default Edcor reply on choke

Edcor has got back - the transformer has a maximum DC current rating of 200mA and the insulation testing is 1000 volts DC to frame or end bell.

1000 VDC is lower than the Transcendar unit, but should be ok I guess, as lot of Hammond chokes being used are rated for less.
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