missan wrote:My platter weighs 40% more than original platter. Could very well be the reason.
Yes, that somehow dampens the response of the loop filter.
missan wrote:My evaluation has been looking at frequency peeks and sidebands, using different frequencies.
The peeks are sharpest with original values of caps.
Auch, that's misinterpreting what you measured.
I'll try to explain, but bear in mind that my English might not be good enough to be clear.
What you are looking at is an FM modulated spectrum.
Amplitude is not important, frequency deviation is.
The best possible loop filter will keep those deviations as small as possible.
However, if you look at the classical spectrum, smaller variations will show up
as a larger amplitude. Once the deviations are big enough (further from the original
signal) they will have no measurable amplitude, they will become invisible.
Now that is what you are seeing.
Small frequency variations will somehow thicken the peak,
while bigger variations will have no influence on the peak.
This is exactly what the original filter values do,
and that's the reason why I wanted to change them.
The difficulty is to keep the small deviations well under control,
while eliminating the larger deviations (something the original filter
simply does not do, as it doesn't improve the weighted w&f values)
missan wrote:I have cleaned the bearings, they are still perfect after long use.
I see no benefit in another bearing if not making the plinth much more rigid.
The bearing well simply doesn't last long on the stock Technics bearing.
And it will create noise.
I cleaned and relubed my bearing several times, visually inspecting it.
It felt still good... But then I changed it to a new (stock) bearing
and you don't need good ears to immediately notice the difference in background noise.
Technics SL-1200 Mk2 recapped / MN bearing / Funk Firm Platter / Denon 103R / Lundahl LL1681
Thorens TD 126 MkIII / SME Series III / Ortofon SME 30H // AT-OC9ML/II
Thorens TD 160 / TP16 / Stanton 681SE
Denon DP-1200 - WIP -