[Penthode]

The tingling is normal for sets of this vintage if you are standing barefoot on a concrete floor. In a living room environment there will be no tingling because you will be standing on a carpet.

If you are experiencing a "tingling" can you explain where you think the current is flowing which creates the tingling?

If still in doubt, you could measure the leakage from the power pins to the chassis. And to confirm it is the the bypass capacitors, you could try disconnecting them and see if the tingling disappears. If so you could reduce the capacitor value at the expense of introducing more noise into the mains supply. I no longer think that is a big deal with all the little switch mode power supplies which proliferate the average household these days.