K&K Audio / Lundahl Transformers

RE: Line output transformer for 76 linestage ...

70.144.190.74

In Reply to: RE: Line output transformer for 76 linestage ... posted by MichaelM on December 28, 2008 at 05:36:20

I can't tell you which will be better with a 76, because I haven't tried either with a 76. There is no issue with saturation of either transformer at your operating point, so that's just not a factor. There is no problem with using the 76 with either transformer. The implication you might see in print that you have to "match" the Rp of the tube precisely with the transformer impedance (e.g. 15K:600) is simply incorrect. A good transformer will "cover" a range of Rps. For the LL1680 and the LL1660, Lundahl recommends that one does not use a tube with an Rp of greater than 15Kohms unless one can compromise the high frequency response listed in the specs.

Kevin Carter
K&K Audio
www.kandkaudio.com

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