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Not real close... R=E/I
for the 6X5, I get R= 6.3 volt / 0.6 amp. so R = 10.5 ohms. 15 ohms is a little high, but with todays higher power line voltages will likely work ok.
for the 25Z6 I get R= 25 volt / O.3 amp , so R = 83 ohms. I would not use a 50 ohm resistor there.
10 watt resistors should be adequate.
jr
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