review33.com: 影音天地: 研究J形，S形，直臂的特色

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[#41] 研究J形，S形，直臂的特色 ZeeZee兄：多謝分享，老作即係原創心得，唔係抄返來，更為珍貴。我讀過inertia of moment好似可以apply落唱臂度，不過已經響應周星星話"能夠忘記係好事"，徹底地俾番阿Sir了。 FR-14和FR-12分別在有效質量為14g和12g，FR-64應該係系列名稱，有效質量唔會去到64g，印象中好似20g左右，比FR-14重，更適合配搭SPU類低compliance的唱頭。 FR-14佢歸納在中等質量設計，較適用於中柔順度大路唱頭。 FR-14既設計精粹除offset臂管外，那尾陀設計係低重心和低慣性(相同重量但扁薄和接近支點)相反的設計是SAEC，尾陀長。今日大部份廠都係生產連殼直臂，相信要照FR-14再整支出黎冇成皮都唔得。最後修改時間: 2012-06-22 11:37:16		孟波正式會員 123.xxx.xxx.186	2012-06-22 11:33

[#42] 研究J形，S形，直臂的特色

孟波兄, Jelco 厰仍然為自己（上圖）以及 Ortofon 等大牌子生産用 Universal headshell 的 S 形唱臂。自己的牌子超值，性价比高，就是不知爲何在香港少見人玩。

我自己的 S 形 9" Ortofon AS-212S (下圖；S 是近期的，有異於舊款 212）就是 Jelco 做的，效果還可以。

Ortofon 的 12" 臂都是 J 形; 現在的 9" 也還是 S 形：

http://www.ortofon.com/products/tonearms

最後修改時間: 2012-06-23 07:49:55

doctorjohn

正式會員
121.xxx.xxx.160

2012-06-23 07:37

[#43] 研究J形，S形，直臂的特色
doctorjohn兄：

Jelco臂在香港唔流行，好大原因可能因為係日本廠。

香港人玩到呢個級數既應該一早玩過FR,SAEC,Micro,Dynavector,Grace,STAX,....等日本大細廠精品，同期Jelco冇乜代表性產品，都係代工替人生產。

認識唔多，所以對Jelco興趣唔大。

最後修改時間: 2012-06-23 11:36:13

孟波

正式會員
123.xxx.xxx.186

2012-06-23 11:28

[#44] 研究J形，S形，直臂的特色
當時好多高級跟盤唱臂都中意造S形，可能係S形唔需要校side balance簡單D.

據聞Jelco代工替人生產好多這類唱臂。

孟波

正式會員
123.xxx.xxx.186

2012-06-23 11:42

[#45] 研究J形，S形，直臂的特色
Jelco新造唱臂在設計和結構上冇特別，也許都係唔熱賣既原因。

Techincs EPA-100，紅寶石bearing 和Dynamic damping 尾陀。

孟波

正式會員
123.xxx.xxx.186

2012-06-23 11:59

[#46] 研究J形，S形，直臂的特色
Ball Sir,

Good pic, just copy into my record, thanks!

Can you tell the condition of the following photo?

Photo-1

et2

正式會員
124.xxx.xxx.19

2012-06-23 13:43

[#47] 研究J形，S形，直臂的特色
Photo-2

et2

正式會員
124.xxx.xxx.19

2012-06-23 13:44

[#48] 研究J形，S形，直臂的特色
Photo-3

All by 1 sec.

et2

正式會員
124.xxx.xxx.19

2012-06-23 13:45

[#49] 研究J形，S形，直臂的特色
et2兄：

係咪

第一張唱盤未起動。

第二張開始唱。

第三張唱到唱臂/唱頭組合既諧振頻率片段，見到支臂上下跳動？

最後修改時間: 2012-06-23 13:52:03

孟波

正式會員
123.xxx.xxx.186

2012-06-23 13:49

[#50] 研究J形，S形，直臂的特色
Ball Sir,

You got 9 out of 10.

Actually the 3rd is by manual 諧振!!!

et2

正式會員
124.xxx.xxx.19

2012-06-23 13:56

[#51] 研究J形，S形，直臂的特色
VRF is about 10Hz

HRF is about 6.5Hz

TT Vertical vibration is about 3-4 Hz (Guess).

Peak to peak ＞ 2mm

The bass still very solid and the sound image also very stable.

最後修改時間: 2012-06-23 14:02:57

et2

正式會員
124.xxx.xxx.19

2012-06-23 14:00

[#52] 研究J形，S形，直臂的特色
et2兄：

用手咁勇？服左你。

孟波

正式會員
123.xxx.xxx.186

2012-06-24 21:04

[#53] 研究J形，S形，直臂的特色
孟波兄,

FR12唱臂的有效質量其實大約是22grams,遠比廠家公報的12grams數據為高, FR54是16grams, 而FR64是35grams, FR64FX則是20grams.

kcc123

正式會員
78.xxx.xxx.2

2012-06-25 08:49

[#54] 研究J形，S形，直臂的特色
FT2兄,

You mentioned “manual 諧振”, does it mean you pushed down on the turntable suspension and let it went up and down?

KCC123兄,

Interested to know how did you come up with the “actual” effective mass of the FR arms? Did you measure the resonance frequency and calculate the effective mass?

Thanks!

mcwk

正式會員
202.xxx.xxx.61

2012-06-25 09:19

[#55] 研究J形，S形，直臂的特色

mcwk hing.

Yes, I press few times on the top of the camp and then let it free float to play.

Actually I can’t say this is 諧振 ( because TT & cartridge are sync at the same time), just use the words to show the action of the cartridge.

et2

正式會員
58.xxx.xxx.77

2012-06-25 14:23

[#56] 研究J形，S形，直臂的特色
ET2兄,

Thanks for your reply!

I am not an engineer, but if I understand correctly, the Hz that the suspended turntable bouncing up and down (after you push it down) is the resonance frequency of the turntable’s suspension. It is also my understanding that the lower the RF of the turntable’s suspension, the better.

As long as the turntable’s RF is not close to the RF of the tonearm/cartridge, there should be no problem. It is no accident that the bass in your system was still very solid and imaging very stable under that situation.

mcwk

正式會員
202.xxx.xxx.61

2012-06-25 14:53

[#57] 研究J形，S形，直臂的特色
mcwk hing,

"is the resonance frequency of the turntable’s "

This is true.

That just for fun!

et2

正式會員
58.xxx.xxx.77

2012-06-25 15:00

[#58] 研究J形，S形，直臂的特色
Hi mcwk,

The figures were measured and quoted by Martin Collom in Hi Fi Choice published years ago.

最後修改時間: 2012-06-25 15:40:44

kcc123

正式會員
78.xxx.xxx.46

2012-06-25 15:28

[#59] 研究J形，S形，直臂的特色
KCC123兄,

Would you happen to have a link, or copy, of that review, as I am really interested to read it? I suppose the effective mass should be affected by the headshell that was used!

Thanks!

mcwk

正式會員
202.xxx.xxx.61

2012-06-25 16:09

[#60] 研究J形，S形，直臂的特色
Hi mcwk 兄,

I have been a long term subscriber of Hi Fi Choice since the seventies and the reviews were published in between 1978 and 1981.

I concur with you that the effective mass of a tonearm can be altered if different mass of headshells are used, consequently solving the mismatch and resonant frequency problems between cartridges and tonearms.

kcc123

正式會員
78.xxx.xxx.46

2012-06-25 16:42