Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Very evil, indeed.

139.134.96.237

Posted by Trevor Wilson on December 22, 1999 at 17:51:49

In Reply to: Re: Very evil, indeed. posted by Borris on December 22, 1999 at 12:39:55:

Borris>
The X-10D is not about supplying gain. The input/output imedence is actually extremely good- that is the purpose of it. Have you actually measured these criteria yourself?

Trevor>
Yes, I have measured the X-10D (original + new tubes fitted) extensively. It cannot meet it's published specifications. It is quoted to have an output impedance of 200 Ohms (not especially low). When loaded with an impedance of less than 1,000 Ohms, the device exhibits high orders of distortion. At 600 Ohms (industry standard), the distortion is too high for my equipment to resolve, accurately. Examination of 'scope traces, is all I am able to do. The distortion is extremely asymetric, in nature. Since it supplies no useful gain, nor is it's output impedance low enough to be of any use, then the device, itself, serves no purpose, other than to distort the signal. It has no place in any high quality audio system. The X-10D does not meet any of it's other published data, either. However, it is the output impedance and associated distortion products, which concerns me more than any of the other figures (which are pretty much beyond the limits of audibility, anyway).

Borris>
As for the Nuvistor, MF have kept enough spares for every single amp produced.

Trevor>
MF have kept ONE spare, for each device produced. One only. After that, there will be no more produced, ever. If MF goes belly up (and if they continue producing crap like the X-10D, they may well do so), then where will purchasers of the Nuvista be? What hope will they have? What if more Nuvistors are consumed, than anticipated?

Borris>
You obviously dont like MF, but I cant see why.

Trevor>
Because I have worked on many MF products. I have listened to many. They do not 'cut it'. Construction, specifications and design, are all below average. Sound quality, being subjective, is in the ear of the beholder. I have heard the best, that MF produce. It does nothing to excite me. I've seen CD players, from MF, which are IDENTICAL to a standard Philips unit, albeit with a hefty price tag. Channel to channel mismatches, which are unacceptable. Poor quality construction techniques, etc, etc.

Trevor

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