Channel Balance on Dynavector XV1-S

This thread may be relevant. The link opens at the post which describes the conclusion in that particular situation.

Regards,
-- Al

Others have already implied it, but azimuth adjustment has very little effect on channel balance, as you already have learned by direct experience. And the goal of azimuth adjustment is to minimize crosstalk, not to balance the channels. I was interested to read that Larryi says intrinsic channel imbalance of a cartridge is often more than 2 db. On the other hand, there is a prominent poster on VA who says that if a cartridge output is more than 1 db different, R vs L, that cartridge is defective and should be returned to the seller. I have no idea where truth lies on that spectrum.

One thing you might do is to swap tubes in your phono stage, R to L and L to R, and see what happens to the channel imbalance. It is possible that your entire problem is due to a difference in gain between the input tube on one channel vs the other; that's where most of phono gain is achieved.

Thanks very much for all your responses. I tried switching the cart tonearm cable connectors from R to L and sure enough the discrepancy moved sides which means it's the cart and not the phono pre. There was a 15-20% difference in output and to me that warrants a repair.

Hessec, I have the Hi-Fi News test lp, on which tracks 3 and 4 are the Channel Balance tracks. I'm using the Basis Vector Alignment Jig and have used it to the best of my not totally incompetent ability (no snark intended). The anti-skate is set with an lp that had a large grooveless section.
Larryi, I'm curious about your statement about a balance control. If all the links in the line are properly balanced and working correctly wouldn't the final balance be correct, and therefore wouldn't using a balance control just be glossing over a problem as well as being more resistors in the line?

Either way, the cart is pretty clearly in need of repair so off it goes and I'll deal with a pretty compromised setup for 4-6 weeks.

Moryoga,

I use the balance control to make pretty fine adjustments which I am sure involve a whole lot of different factors, including room acoustics affecting balance. Balance controls can also be used to compensate for channel imbalances of cartridges. My current cartridge has a small imbalance where one channel is a little less than 1 db lower in level compared to the other.

When I had a Levinson Ref. No. 32 linestage in my system, I could make really fine adjustments to channel balance (allowed for .1 db increments of change). I was really surprised to find that while 1 db of volume change with music playing is not something one can reliably hear, one can hear a .2 db shift in channel balance (noticeable with the position of a centered vocalist or with mono recordings). To me, life is just easier with a balance control when it comes to fine tuning a system.

The Vector alignment guage is an extremely accurate device that allows for very precise alignment. I have noticed that a tiny fraction of a millimeter off and the tonearm profile will be grossly mismatched with the outline etched on the guage. When everything matches, the alignment agrees with that of the Feickert alignment tool. Hence, if you did the alignment per the Basis instruction, you should have the cartridge perfectly aligned and there is no issue in that respect.

Moryoga, Azimuth is a mechanical alignment of the needle in the groove, and is probably best set mechanically (visually-microscope). The fosgometer measures a voltage, as a surrogate marker for alignment. There may be discrepancies in the phonostage so best to leave this out of the circuit. There may be an electrical imbalance in the cartridge, and it would be wrong to misalign the needle to compensate. I would also try another test record, they are not perfect, and I have very different readings on the "fos" with different records.
For me it is all too hard, and I don't trust the test record, and I don't trust that electrical output means physical alignment. I suspect some high tech oscilloscope using a calibrated test record, minimising cross talk is the only "practical" way to do it properly.
Another way is, if it ain't broke don't fix it, in other words if the sound is good don't fiddle:)
That's as far as I've got, happy to learn from others.