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It is interesting: I am running now Zarathustra amp with my woofer towers, line-level crossed at 90Hz with fist order. Everything is very fine bass-wise, with very minute touch of dominating smoothness.  To my surprise the typical upper-bass harmonic thinness that all SS amp have do not manifest itself. Probably the 3kW transformers per channel and 2x100.000 caps do thier duty. Dima suggested that improvement in PS department would affect exactly upperbass, not necessarily the lower bass; it looks like he was correct. Some my local guys stopped by recently to listen my audio and they were surprised to see Lamm ML2 sitting not being even connected and the Zarathustra driving the woofers – the Zarathustra juts produce simply way better and more usable bass.

I kind of still have a feeling that Melquiades bass with 7H @full power transformer was more interesting.  Probably the more interesting bass quality of the Melquiades with that transformer was that it made possible for me to fashion my own bass. It was kind of freaky: when you use SET around 6C33C then an adjustment of plate current within 30-50mA hardly affect sound. With Melquiades armed with THAT transformer any minute adjustment of plate current, even within 5mA affected bass HUGELY and the change of current within 50mA totally “inverted” bass. That all took place at vicinity of 200mA while the transformer’s maximum current is 450mA. I do not know, when I build the Super Melquiades I would certainly see if Zarathustra bass would stay against the Super Melquiades. (The Super Melq. will have beside of THAT OPT the 1A/350V 100% duty power transformer and LCRC filter 10H-100uF-50R-10.000uF)

In any rate what Zarathustra does with bass is quite musical, tanks to it’s upper bass harmonic richness. I would say subjectively that it slightly more on soft side (isn’t it how it should be?)  but to say anything defiantly it would necessary to dial it with precision of 1/2-1/3 db per channel that I did not do yet.

Rgs,
The Cat

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