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VR1 needs to be reverse log probably 5K. There are a number of designations for this but the modern expression for 5K reverse log is "C5K". But control may be wonky if the pot is not high quality or too sensitive at high gain settings if the value is too large. For best results use a high quality sealed conductive plastic C5K. But these are quite difficult to find and probably expensive. I have used the ultra-cheap alpha 9mm C5K from places like smallbear and tayda and they worked fine. The typical 16mm pot like you'll find on Ebay are ok too. But for a really high quality build it deserves to be better quality (a Bourns 51 would be very good for example but C5K is not a standard value). You could use C10K but when you get to the higher gain settings, the gain will jump at the very end of the travel. OTOH the low gain setting will not be quite as low with C5K so if the circuit calls for C10K then that would be fine (but I would still use C5K anyway). Or if you find a dual C10K you could wire both sections in parallel to make a single C5K.