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RE: LL1620AM-PP EL34

Posted by KevinC (M) on July 24, 2013 at 08:51:12

In Reply to: LL1620AM-PP EL34 posted by kmtang on July 24, 2013 at 06:30:41:

Your post illustrates a good point regarding transformer design and application. In a SE amp output transformer, the operating range of the transformer is between zero flux and maximum flux in only one field polarity, so the tube never pushes the signal through zero flux into the other field polarity. The silicon iron magnetic material has significant nonlinearity in the region around zero flux, so by avoiding that region of operation the SE amp can avoid the resulting sonic penalties. However, the amorphous iron material has much less of this nonlinearity, so centering the audio signal (magnetic flux) around zero results in the same sort of "sonic magic" in the output stage as SE operation.

The only time I saw one of Allen's amps (at VSAC 2003), it has silicon iron transformers, but that was before the AM cores were available from Lundahl. I have no info on amps later than that.

Kevin Carter
K&K Audio
www.kandkaudio.com

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