Beogram 1700 adjusments - wow and flutter parallelism speed

18 replies
Yes. Fortunately, speed is easily adjusted.

Below are the w/f results logged after belt replacement. I can live with (more of less) .2 w/f.

3151.8 0.0778 0.1964
3144.6 0.0807 0.1964
3154.6 0.0900 0.1964
3143.2 0.0892 0.1964
3154.0 0.0756 0.1939
3144.8 0.0867 0.1939
3151.3 0.0916 0.1939
3147.4 0.0536 0.1939
3148.6 0.0894 0.1939
3150.6 0.0744 0.1806
3145.5 0.0745 0.1794
3153.0 0.0949 0.2078
3144.4 0.0751 0.2078
3152.4 0.0763 0.2078
3146.1 0.0881 0.2078
3149.5 0.0940 0.2078
3149.2 0.0986 0.2078
3146.6 0.1020 0.2078
3152.1 0.0776 0.2078
3143.7 0.0950 0.2211
3154.8 0.0821 0.2211
3142.3 0.0874 0.2211
3154.3 0.0866 0.2211
3144.1 0.0921 0.2211
3151.5 0.0708 0.2211
3147.1 0.1084 0.2211
3148.4 0.0633 0.2211
3150.3 0.0677 0.2211
3145.6 0.0896 0.2211
3152.6 0.0663 0.1921
3144.3 0.0804 0.1921
3152.0 0.0825 0.1921
3146.1 0.0695 0.1921
3149.0 0.0769 0.1860
3149.1 0.0931 0.1860
3146.3 0.0766 0.1810
3152.5 0.0903 0.1810
3143.2 0.0972 0.1829
3154.6 0.0676 0.1829
3141.9 0.1019 0.1930
3154.3 0.0645 0.1930
3143.8 0.0889 0.1930
3151.5 0.0884 0.1930
3146.7 0.0944 0.1930
3148.5 0.0740 0.1930
3150.4 0.0975 0.1930
3145.6 0.0671 0.1930
And next up, I'd like to adjust tonearm parallelism. I've got the manual but haven't figured out where the adjustment screws are. Can somebody tell me?

Ah. A repairman clued me in. All good. Need to loosen the circled bit. Then you can gently (and very carefully) adjust the tonearm as necessary.
Glad you got to a spot where you are happy! I haven’t had a chance to check the table with the RPM app again, but I believe it was around .2 W&F when I checked last. That is perfectly fine for me as I can’t hear that in the slightest. Remember not to get too caught up in the numbers (the RPM app also isn’t exactly perfect). Enjoy that Beogram!

Location: Pennsylvania, USA

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- Michael Archambault
That adjustment is your azimuth and really cannot be done visually. A static measurement assumes the diamond and cantilever is perfectly orthogonal to the record surface which is seldom true. Unless you have a measurement capability to check for optimum channel separation using a test record, you should not try to fine-tune this adjustment.
I have a test record.
I’ve also got an Azimuth grid.
Am azimuth grid assumes a perfect cartridge and won't yield the result you are seeking. Correct azimuth alignment is when both channels are at their maximum balanced separation which requires both a test record that has single-modulated channel tracks and an RMS meter or a Fozimeter for the measurement.
Right. And I'm about to throw in the towel trying to get the volume of the leakage and reference tones to match exactly. Using a tiny bubble level so I could see what I was doing, I would go ever-so-slightly too far in one direction or the other adjusting the tonearm, hoping to hear a different result in the separation test. No dice. So far, the high-end rebuilt cart I got from AO hasn't worked out how I hoped. Maybe it's not a good match for my 1700; maybe the table has other issues; maybe I've done something not quite right; I'm really not sure. I've adjusted anti skate more than I care to admit. All that being said, true statement: I got better results across the board with the old MMC20EN that came with the table. But... I have no idea what kind of wear the stylus has or what state the suspension is in. That said, yesterday I sent the MMC20EN that came with the table to SoundSmith for evaluation and potential rebuild. Crossing fingers I'll make it to the promised land.

 

Ah... found an interesting germane comment from Peter Ledermann, at least with regard to his cartridges:

'...if one channel is always much better in terms of less crosstalk than the other; tune the azimuth by using the worse of the two channels. Again, the best way to tune the “worst” channel is to find the point where the crosstalk “just” becomes minimized and go no farther. Verify that the other channel is still better in that it has less crosstalk. If you NOW FIND that you have NOT gone more than a tiny bit off the neutral position to do this, you have probably hit the best azimuth.

If you find you are way off neutral, that is wrong, and you must start over.'
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