K&K Audio / Lundahl Transformers

Posted by AndyN (A) on February 16, 2004 at 05:02:06

In Reply to: Cool! And a question... posted by KevinC on February 16, 2004 at 04:27:11:

I connected it the "wrong way round" so the usual inputs are my outputs. From memory this makes it 4:1+1. So I have a sub 500R output impedance rather than the 2K as before. The circuit is just so simple. TVC into the grid with a 12v battery for DC offset. 6K8 (from memory) Mills 12W anode load, cathode straight to earth and 1mfd Crescendo cap into the LL1676. Golly it cant get much simpler! The only thing is the heater currents a bit high for a single triode - but thats trivia really.

Thanks for your advice. I guess its nice for you to hear when things go well.

I still like the idea of a proper push push drive as I can earth the centre tap in the power amp. I use 22k load resistors per side (in the power amp) but these are effectively bypassed by the low DC resistance of the LL1676. All in all its simple and elegant and so should be right?

Andy

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