Fun with vinyl measurements

[Quando]

Quando, you have to understand the one Golden Rule with this community:

Don’t mess with »Forum Donors«

That’s not so hard to grasp, is it?

OK

 

[MaxwellsEq]

Quando, you have to understand the one Golden Rule with this community:

Don’t mess with »Forum Donors«

That’s not so hard to grasp, is it?

You too can be a forum donor if you want. You don't have a to join a sect or anything.

 

[mglobe]

Ignore engaged

 

[JP]

Forum donors don’t get any special treatment. Being rude and wrong will make people ignore you though.

 

[Thomas_A]

My Axis running a bit slow again. Time for adjustment. These belt drives...

 

[markstein]

In my opinion, do not prioritize amplitude as you seem to be doing. I would prioritize frequency (aim for higher). Obviously if the result is an out of control resonance, that's not great, but if there were two results, one at 10Hz that's 3dB lower than one at 15Hz, I'd probably still pick the higher frequency just to keep everything away from 4Hz. I'd then damp the arm+cartridge and use a filter in the preamplifier below 30Hz.

Which config do you like best, and why?

Microsoft OneDrive

1drv.ms

https://1drv.ms/i/c/681f9ce5e982b1dd/EZwxfveyDoNKvYs2nf8_bzMBNxLoDRQN72pYxRY1TwWJ3w

Edit:
I think these measurements show:
- The KAB silicone oil damper has a positive effect on tonearm resonance (both absolute amplitude and width)
- The heavier HS1A headshell has a slight edge over the Technics stock headshell

 

[markstein]

.

 

[Quando]

Which config do you like best, and why?

Microsoft OneDrive

1drv.ms

https://1drv.ms/i/c/681f9ce5e982b1dd/EZwxfveyDoNKvYs2nf8_bzMBNxLoDRQN72pYxRY1TwWJ3w

Edit:
I think these measurements show:
- The KAB silicone oil damper has a positive effect on tonearm resonance (both absolute amplitude and width)
- The heavier HS1A headshell has a slight edge over the Technics stock headshell

Any explanation of what's what in these charts?

 

[JP]

My Axis running a bit slow again. Time for adjustment. These belt drives...
View attachment 398271

Regardless, still a really nice looking plot.

 

[BDWoody]

Quando, you have to understand the one Golden Rule with this community:

Don’t mess with »Forum Donors«

What a ridiculous comment.

Here's one that's actually true:

Don't throw out garbage statements like that because you just highlight your ignorance and/or pettiness.

Forum donors don’t get any special treatment. Being rude and wrong will make people ignore you though.

You get to post items for sale, edit posts for longer, and I think that's about it.

It's amusing how often our newest members feel they have the inside track on how this place runs.

 

[Thomas_A]

Regardless, still a really nice looking plot.

Yes, it’s good although not top notch. If my 1990’s Axis will fail beyond repair I might get a good DD. Right now I think I will fail before that happens.

 

[morillon]

Yes, it’s good although not top notch. If my 1990’s Axis will fail beyond repair I might get a good DD. Right now I think I will fail before that happens.

I arrive long after the start of the battle and everything must have been discussed...but..
Isn't this an electronically controlled dc motor?

 

[Thomas_A]

I arrive long after the start of the battle and everything must have been discussed...but..
Isn't this an electronically controlled dc motor?

AC motor. It starts up with high voltage and then drops to low voltage when speed is up. Wien bridge circuit. Also torque sensing, so any slow down leads to power up again. But it never happens during play, only of you for example use a dust brush on the record.

 

[morillon]

AC motor. It starts up with high voltage and then drops to low voltage when speed is up. Wien bridge circuit. Also torque sensing, so any slow down leads to power up again. But it never happens during play, only of you for example use a dust brush on the record.

I know maybe not well..are you sure that in the first place..does not accompany the frequency of your sector? did you carry out your measurements at a time when the frequency is nominal with a control via a fairly precise frequency meter?
I understand that your electronics do not regulate your frequency...

 

[Thomas_A]

I know maybe not well..are you sure that in the first place..does not accompany the frequency of your sector? did you carry out your measurements at a time when the frequency is nominal with a control via a fairly precise frequency meter?
I understand that your electronics do not regulate your frequency...

There are trim pots for the frequency under the Axis. Akward to set them. I may have switched the belt orientation when I cleaned it last time. Or it might just be some other reason for the drift. Who knows...

 

[morillon]

There are trim pots for the frequency under the Axis. Akward to set them. I may have switched the belt orientation when I cleaned it last time. Or it might just be some other reason for the drift. Who knows...

probably requires work on differential probe and... caution...etc and a qualified technician for electronic.

 

[Thomas_A]

probably requires work on differential probe and... caution...etc and a qualified technician for electronic.

The trim pots are on the curcuit board but the Axis has two holes in the plinth under the TT, one for 33 and one for 45, to access the pots. I have to use two chairs as TT stand to get access to the holes and adjust them while playing 3150 Hz and looking at the Nak T-100 result. It works but requires some ”athletic” excercise from my side.

 

[morillon]

a recapping may be welcome....
the people working on the linn historically had an empty furniture frame to place the LPs and adjust them...

 

[Thomas_A]

a recapping may be welcome....
the people working on the linn historically had an empty furniture frame to place the LPs and adjust them...

Recapping has been done including changing a wobbly pulley. I had some troubles in this project though, documented somewhere in this thread. The motor in the Axis is special. Looks like a Linn standard motor but it is not.

 

[Balle Clorin]

How much does test records vary for the same set-up? - Audio-Technica OC9MLii on SME V, Michell Gyro SE. 60db gain into 47kohm db reference 2.11Vrms. Azimuth adjusted to -37/-37 on Tohiba LF-90001