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Re: thanks, but now I'm a little confused...

Posted by KevinC (M) on August 31, 2003 at 03:54:33

In Reply to: thanks, but now I'm a little confused... posted by Tre' on August 30, 2003 at 17:30:17:

Tre,

Thinking one thing then writing another; if this is a qualification for declaration of onset of old age, then..

You are perfectly correct, of course, that connection alternative V is almost what I meant to type. However, if you go up to the Lundahl website and download the datasheet for the LL1660S, you will find a variation on V named B that includes the shields I mentioned in last night's post. That is what I should have typed.

The allowable primary current depends, as you guessed, on the primary hook-up. With the primaries in parallel, as they would be in alternative B, that nearly doubles the maximum current to 18mA with the transformer that is rated for 10mA service with the primaries in series. The usual silicon iron transformer core material saturates at something like 1.6 Tesla, so 0.9T is roughly the half saturation point, which is the highest point on the magnetic curve that you would want to "bias" the transformer and still get all of the magnetic capacity from it in audio use.

Sorry for the confusion,

Kevin Carter
K&K Audio
www.kandkaudio.com

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