Although it is a little expensive, the following POT is recommended if sound quality is important.Some datasheet specs to put this in context:
Alps RK27 series - £8.78 each at 500+ quantities, Gang error <3dB 0 to -60dB, <5db -60dB to -80dB
Bourns PTD90 series - £0.92 each at 500+ quantities, Gang error <3dB 0 to -40dB, unspecified at greater attenuation
Even the 'poor' performance of this unit is within the spec of a standard high quality pot range. Manufacturers would need to test the pots if they wanted a tighter match - not unprecedented, but probably uncommon at this price point.
Also note the lack of standard for taper letter designations - for Bourns the A[1-6] series are log tapers, while the B series are symmetrical about the centre point. Vishay do something else entirely.
It is also sold at Amazon in Japan.
Of course, Taper-A is used for volume control.
However, the pin arrangement is the same, but the size needs to be checked.
CP600 (Potentiometer)
http://www.tkd-corp.com/products/pot/potentiometer.html#cp600
When I examined it in detail, it seems that it cannot be installed unless it is BOURNS PTD90 Series.
Looking at the photo of the SP200 main board, it seems that the volume POT is not directly attached to the main board, but is attached to the main board after being attached to a small board.
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