Thanks for your words Ralf: particularly appreciated because I know it comes from someone who knows well how much sweat it takes to get off the beaten path.
I've been running around my corKscrew RTA for 6 months before "stumbling" on this box, and I don't even know if it can really work. As you may certainly imagine, the problems don't seem simple.
Now I'm building a TT that has been sleeping for 10 years, but then I'll get my hands on it; some things need to be examined from far.
ciao - carlo
I've been running around my corKscrew RTA for 6 months before "stumbling" on this box, and I don't even know if it can really work. As you may certainly imagine, the problems don't seem simple.
Now I'm building a TT that has been sleeping for 10 years, but then I'll get my hands on it; some things need to be examined from far.
ciao - carlo
What arm will you use please?
Interested to know about the TT as well! - maybe OT but we can come back from there!
M
Hello gentlemen
Depending upon your general arm design, consider
re-purposing an old microscope's rack and pinion focusing parts.
Even available new(but expensive...):
Rack and Pinion Focusing Mounts for Imaging Systems
or something like this:
Lens Focusing Mount
Happy Easter to all!
Frank
PS. I have no affiliation with these companies... ;-)
Depending upon your general arm design, consider
re-purposing an old microscope's rack and pinion focusing parts.
Even available new(but expensive...):
Rack and Pinion Focusing Mounts for Imaging Systems
or something like this:
Lens Focusing Mount
Happy Easter to all!
Frank
PS. I have no affiliation with these companies... ;-)
I bought this from a fourm member. I forgot what it’s off of. Lol
I think it’s off a AR table from the late 70’s early to mid 80’s
Maybe there are some standard pipe and pipe fittings large enough to take the main mount and you can arrange that the mount progresses on the pitch as you turn them.
I am sure someone has done this!
Are you sure there isn´t a set screw somewhere in the black cylindrical part of the base? It looks very much to me as if you can raise and lower the inner blanck metal cylinder relative to the bas as you can with a lot of other arms
I think its reasonably certain that each small part will have its own resonance, and as they are small and stiff its likely they are quite high frequency, but whether as a system it has one i don't know, and what makes up the system i don't know either.
I think i demonstrated that there was something around 8-12 Hz that i could move my adding and subtracting weight to the cartridge and top CW pair, but it didn't behave the same on the lower levers.............
I will bore you all again soon with some additional learning from my experimentation with rails in a vertical orientation and see what i can learn from that.
Mike
Good evening Niffy, i changed the rail system to vertical orientation brass rails and hence the cart to suit, no difference to the 23Hz and not the hoped for reduction in resistance either, but its OK so i shall persevere for now.
I feel it leaves only the cartridge carrier or the TT/plinth to study further now.
Plots for interest attached and a pic of this orientation experiment.
Mike
Attachments
Hi koldby,
I could be wrong, but I thought that carlthess40 was making reference to "on the fly VTA" adjustments.
Sincerely
Ralf
Did you find if the two cylinders slide vertically to set height if you remove any grubscrews like Koldby suggested? - if you already have that then its a whole lot easier!!
I think that it is highly likely that the systems inherent damping is great enough to prevent it producing a peek in the frequency response. Even if the resonant peek is suppressed the system will still have a natural resonant frequency. Below resonance the arm will follow the motion of the record surface, albeit with some resistance due to friction. Above resonance the motion of the arm will not follow the motion of the record but remain relatively fixed. The degree to which it remains fixed will reduce with increased frequency. We can tell that the resonant frequency of Mike's arm is in the right ballpark as it tracks warps and eccentricity and plays music.it just finding out exactly where in the ballpark that's the issue.
Niffy
Hi Mike,
I would be surprised if the 23hz was due to the deck. In my books the Origin Live decks are, pound for pound, the best commercial decks available.
Have you tried taking a measurement with the stylus resting on a record with the deck off and with the motor running but the belt removed?
Niffy
I would be surprised if the 23hz was due to the deck. In my books the Origin Live decks are, pound for pound, the best commercial decks available.
Have you tried taking a measurement with the stylus resting on a record with the deck off and with the motor running but the belt removed?
Niffy