Friday, June 22, 2018

The Perils of Using Tangential Arms?


 Among all the cartridges (>100) I've inspected for friends in the past few years, only 4 showed obvious stylus wear.   Interestingly, 3 of them  were installed on air-bearing arms, the other on a tangential pivoted arm. The photos below are from the most recent case,  showing a chunk in the right-channel side of the stylus chipped away. According to the owner of the cartridge, he followed the advice from an "expert" and adjusted the air pressure to the arm  lower to get "fuller bodied"  sound. 

I believe there is nothing intrinsically wrong with those arm designs, though one should definitely pay more attention to the setup and maintenance aspects. Especially with the air-bearing type, any issue in the air transmission lines can put huge stress on the cartridge and its stylus. 




Thursday, June 14, 2018

Before-and-After Data of Cartridge Adjusted by Manufacturer

Before-and-after comparisons of a cartridge that, based on my assessments/recommendations, was sent back to the manufacturer for adjustments in its cantilever angle, etc. Looking at the differences in data below, most people will have a hard time believing they are measured on the same cartridge.

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Thursday, June 7, 2018

Steep Angle Needed for a vdH Black Beauty

This vdH Black Beauty needs plenty of tilting forward. With its top level, the IMD is unacceptably high at about 12%. Lowering the arm high makes it even worse. Raising the arm on the SL1200G to the limit and slight improvements start to show. Eventually need to shim 3 pieces of cards in its front to get the numbers into the 2 to 3% range.

這個 vdH Black Beauty,調整到上緣水平時,IMD竟然高達12以上!降低一些更差,到14。SL─1200G的唱臂調到最高,稍微好一些到11左右。最後竟然前緣要墊3張名片的厚度,才到不錯的數字範圍。

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Friday, June 1, 2018

AnalogMagik's Tracking Force Function

After finished writing the Part-1 of AnalogMagik review, I started to test the remaining features I haven't spent much time on. The Tracking Force function are verified on two cartridges here, Lyra Kleos (recommended VTF=1.73 according to the user manual) and DS Audio DS 002 (recommended VTF=1.7). Figure 1 is the final VTF for the Kleos after optimizing for the lowest THD using AnalogMagik. Figure 2 is for the DS 002. For the Kleos which is my main reference cartridge for the past 2+ years, even though the change is only -0.04g from the original setting, the sound has become much more refined with high-frequency extension unheard before. Similar improvements are also heard on the DS 002, but somewhat less drastic even though the change in VTF is much greater.

第一部份的評論交稿之後,開始測試 AnalogMagik其它還沒仔細研究的功能。Lyra Kleos(廠方建議針壓 1.73)最佳化後的針壓如圖一,DS Audio DS 002 (廠方建議針壓 1.7)最佳化後的針壓如圖二。調整後,兩者高頻變得細膩很多,尤其是已經用了2年多的 Kleos比起之前,「高貴感」進步幅度相當明顯。

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