Examples of ratios and gain available with a 47KΩ MM phonostage

The transformer input impedance	Turns Ratio 1:	Max possible gain in dB
30	40	31,9
35	37	31,3
40	34	30,7
45	32	30,2
50	31	29,7
60	28	28,9
70	26	28,3
80	24	27,7
90	23	27,2
100	22	28,9
120	20	25,9
140	18	25,3
160	17	24,7
180	16	24,2
200	15	23,7
250	14	22,7
300	13	21,9
325	12	21,6
475	10	20

Example of minimum and maximum gain configurations (Source: https://www.vinylengine.com/step-ups-and-mc-cartridges.shtml)