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In Reply to: RE: Best Lundahls for a 300b Tubelabse posted by Matthifi on April 15, 2008 at 03:35:34
For the output transformer, I would chose the LL1664 in one of its gapped single ended versions, depending on what operating point you choose for your 300B. You can get transformers gapped for 60mA, 80mA, and 100mA. I stock only the 100mA, but can get the others with a 3-4 week delay at no extra cost.
For the power transformer, what I would chose would depend on how much power I wanted out of the amplifier, my biases with regard to the best kind of power supply filter, and how I want to power the 300B filaments. In any case, the PC board will have to be modified to provide a bridge rectifier for a Lundahl power transformer, because they don't really have a center tap as does the one shown in the TubeLab schematic. Since the PC board accommodates tube and solid state rectifiers, a hybrid bridge can be constructed by cutting a few traces and adding a few jumpers. I use such a rectifier combination in the $15K Art Audio Vivo amp, so I obviously believe it is good sonic value! If I were to accept about 6 watts/ch output, I would design an LCLC filter for my amplifier and use the LL1651 power transformer. For the first choke (inserted prior to C1) I would use the LL1638/8H and then in place of R1, I would use an LL1673/10H. Using chokes with different properties helps avoid PS resonances.
Of course, other power supply configurations are also possible.
Kevin Carter
K&K Audio
www.kandkaudio.com
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