Depends if you want modern tubes or NOS to match what was originally supplied with the Marantz.
If you want NOS, email me for names of a couple of my vendors who have stocks. Be forewarned that original tubes are pricey, but so is the value of an authentic Marantz 10B.
If you want NOS, email me for names of a couple of my vendors who have stocks. Be forewarned that original tubes are pricey, but so is the value of an authentic Marantz 10B.