Anyone try the replica B-60 Fidelity Research VTA?
Dear Lew, I don't agree with you assertion that B-60 will work as any other VTA adjuster. The reason is dynamic function of the FR-64. This means that both dynamic function as well VTF adjustment are function of the same spring. I am not mechanical engineer but don't believe that this spring will work different depending from the ''up'' or ''down'' position of the arm in relation to the record surface. |
@ct0517 Chakster. I did not say concern, I said curiosity. I am curious and asked for information from someone reading on this thread with a B60. Surely with a slick accessory like the B60 it’s what, a 3-4 minute exercise, to give me a number. I would be happy to give that numbers to you, but my B-60 + FR-64s has not been mounted yet on a turntable as i have FR-64fx right there at the moment. @lewm The change in VTF associated with the typical minute adjustments to VTA/SRA is not worth worrying about. You can calculate it as a percentage change, if you know your geometry and vector algebra, but it will be tiny and not worth your concern, at least not to the degree that you appear to be concerned. Do you change VTA (or SRA) with every LP? I cannot be bothered. Exactly, i don’t care about it at all. Also i don’t have any cartridge (i have about 20) that is so sensitive to the VTF or VTA, there is a range giving by the menufacturer anyway. In other words i just don’t understand people who are crazy about VTF/VTA for each record. If everything set up correctly i can not detect any difference in minor changes in my system which is very sensitive. Reed 3p is my favorite tonearm when it comes to a proper adjustment of everything on the fly. I am thinking about B-60 as a resonance control and a proper tonearm base and stabilizer, i do not adjust VTA for each record, i do that for each cartridge. Without B-60 the FR-64s is not good in my opinion. Without the B-60 i love the FR-64fx. |
N Andric, I think you are saying that the VTF in the FR 64S is largely governed by the spring that applies the VTF Which is controlled by a rotary knob on the side of the tonearm. I don’t think that makes any difference. If you have adjusted VTF with the arm wand level to the LP surface, and then you crank the B60 downward , there would be additional force over and above the adjusted VTF, distributed according to the new angle of the arm with respect to the surface of the LP. In words, there is always some additional gravitational force on the tonearm in addition to whatever you have cranked in using the spring. The spring doesn’t cancel gravity. Try it and see. |
Dear Lew, Each time you mention or suggest Newton I feel uneasy. Sometime I have difficulty to remember the name of my mom while you ''demand'' from me to remember physics from my college of 60 years ago. So instead of ''your gravity argument'' I will use the ''pudding argument'' . I performed ''some'' repeatable experiments which are ''scientific'' in the sense that anyone who owns both the FR-64 and B-60 (+ measuring scale) should get the same result. My ''theory'' was that the spring tension in the VTF adjuster by the FR-64 ''does not care'' at which level the tonearm is in relation to the VTF. So I started with parallel position , the scale on the (SP 10) platter at the level of the ordinary (170g) record. The VTF was exactly 2 g. Then I moved the arm up to about 2-3 mm and measured again the VTF which was as before 2 g. Then I moved the arm to its original (parallel position) and from there for 2-3 mm down . I got again 2 g as result. I think that the only way to refute my finding is to put some huge magnets under your beloved SP 10,III when measuring the ''up'' and ''down'' position on your B-60 (grin). |
nandric My ''theory'' was that the spring tension in the VTF adjuster by the FR-64 ''does not care'' at which level the tonearm is in relation to the VTF. So I started with parallel position , the scale on the (SP 10) platter at the level of the ordinary (170g) record. The VTF was exactly 2 g. Then I moved the arm up to about 2-3 mm and measured again the VTF which was as before 2 g. Then I moved the arm to its original (parallel position) and from there for 2-3 mm down . I got again 2 g as result.Those are the results I'd expect when a pickup arm adjusts VTF in that fashion. That's why it's called "dynamic" balancing as opposed to "static" balancing. |
