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Re: Question about jensen input transformers

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e.lectronick wrote:

What I don't understand is why you couldn't use a single input transformer and couple the two outputs to each of the two grids of a differential pair of tubes? The second Jensen schematic shows *two* transformers, one for each tube in a differential pair. Why?
My only suspicion is that the transformer outputs to the grids need to be ground referenced, but that could be taken care of by using 1% matched resistors to ground on each line, right? I've seen it done on non center tapped heater windings of power transformers, why not on input transformers?
Is it simply a case of Jensen wanting to sell twice the # of transformers?
Thanks for any insights you might have.

Well, an audio input transformer and a power transformer are worlds apart. I know that Jensen uses special winding techniques to effectively produce a smooth Bessel high frequency rolloff to avoid phase distortion (or Deviation from Linear Phase as Jensen would say) and that may preclude getting a symmetrical output using a simple resistor voltage divider.

Your best bet would be to ask Bill Whitlock (president of Jensen Transformers) who wrote most of the ASxxx application notes and most likely the one you're referring to. You can reach him via EMail at bill.whitlock@verizon.net.

Whatever the reason I'm pretty sure it's not simply a matter of selling more transformers.

se






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