How many positions do You need ?
Lorlin has many but not knurled shaft ones. You can always fit a new knob.
https://pt.farnell.com/lorlin/ck104...MIodSJkszq7gIVTdTtCh0c3we4EAAYASAAEgICEPD_BwE
Alps Electric, 3 Position 4P3T Rotary Switch, 150 mA, Pc Pin | eBay
You could also try to find used vintage switches. Many amps used them for switching speakers.
Lorlin has many but not knurled shaft ones. You can always fit a new knob.
https://pt.farnell.com/lorlin/ck104...MIodSJkszq7gIVTdTtCh0c3we4EAAYASAAEgICEPD_BwE
Alps Electric, 3 Position 4P3T Rotary Switch, 150 mA, Pc Pin | eBay
You could also try to find used vintage switches. Many amps used them for switching speakers.