[R-390] Tech Query R-390 power supply

[pete williams]

 The  Power  supply in the  R-390 has 47 ohm current limiting  resistors in the 
cathodes of the 26Z5W rectifiers.
Being forced to  rewire  sockets to take12BW4 tubes one  asks  how necessary-apart 
from tube life - is it advisable to include a  current limiting  resistor.
 I am aware of the lower impedance of the alternate tube  which, on the  face of it 
seems to imply a  R of 50 - 100 ohms  might be  necessary.
Comment ?

Pete D..Williams
METUNG, 3904
AUSTRALIA
jupete at bigpond.net.au