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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: yep.... it's blue posted by MQracing on April 9, 2004 at 19:16:28:
The MAC circuit and other LTPs phase splitters work a little better than the Compact because the LTP is DCed to the previous stage and floates on a larger cathode resistor.And this little tidbit of a refinement for the Compact could be all that's needed to get much better balance. Simply direct couple the 6BQ5s to the input\driver tube (my vote would be 6sn7 run low and hard) and increase the cathode resistor to get proper bias. Heck the larger B+ would be easier to come buy than the one speced in the artical. The grid on the non-driven tube would have to be cap coupled to ground and connected to the driver tube's plate via a large resistor. The only draw back would be the cathode resistor would have to be hefty 12watts min 20 watts typical. In this case the CCS would have more room to work, the choke wouldn't be the best choice. Another benny would be no coupling cap but the grounded grid cap usually is larger .47uf vs .1uf.
Back to the MAC. This design, as we all know, uses cathode windings in the output tubes plus an overall feedback winding that is directly in the input tubes cathode circuit plus sundrie feedback loops in other stages. With all of this NFB the dang thing can't be anything but ballanced. The low turns ratio and bifilar wound primary legs ain't no bummer either. With all of these great inovations some folks still like 1920s designs better, go figure.
A better example would be Mullard.
Later, Scott
AS usaul spelling and grammer doesn't count.
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- The MAC circuit and simple refinements. - Scholl 18:07:48 04/10/04 (0)
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