My Micro Seiki MA505LS arm on my 401 has VTA on the fly that is very easily and gently moved while a record is playing. It also incorporates a very secure locking method.
Check the arm out on vinyl engine or similar to see how this VTA on the fly works, it is a basic inbuilt feature of the arm design and not a later add on type of system.
While my ears are not as finely honed as drrsutliff, I can easily hear the changes depending upon the quality of the cartridge being used at the time.
The Koetsu Black Goldline and the Ortofon Black Cadenza were very audible to my ears with VTA on the fly change.
Vintage MM carts definitely not so much so.
Check the arm out on vinyl engine or similar to see how this VTA on the fly works, it is a basic inbuilt feature of the arm design and not a later add on type of system.
While my ears are not as finely honed as drrsutliff, I can easily hear the changes depending upon the quality of the cartridge being used at the time.
The Koetsu Black Goldline and the Ortofon Black Cadenza were very audible to my ears with VTA on the fly change.
Vintage MM carts definitely not so much so.