I noticed on the 100watt silverface I am working on, the center tap is to ground and filament leads are also grounded through 2 100ohm resistors at the pilot light.
Is there any benefit to having both? I've read a few times that if the Filaments s are grounded this way it is common to tape off the CT.
Dumb question, nothing to learn here
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studiodunn
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Dumb question, nothing to learn here
Last edited by studiodunn on Mon Oct 10, 2016 5:26 pm, edited 1 time in total.
Re: Dumb question, nothing to learn here
Both heaters center tap and 100r resistors for artificial center tap? It is one or the other, and the resistor method will protect the PT against shorts. Remove the 6.3VAC center tap, and leave the 100r resistors.
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studiodunn
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Re: Dumb question, nothing to learn here
Thanks jelle. I just realized I'm talking about two separate CTs. The 6.3v winding has no CT, hence the artificial CT set-up.
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Re: Dumb question, nothing to learn here
Good, yes, that is why I asked. Good you caught it. 
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Stevem
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M
If you up those resistors to 2 watters then they will not burn up when the inevitable output tube screen to filament short takes place!
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Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
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dorrisant
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Re: M
So would you up the wattage or use it as a fuse?Stevem wrote:If you up those resistors to 2 watters then they will not burn up when the inevitable output tube screen to filament short takes place!
"Education is what you're left with after you have forgotten what you have learned" - Enzo
Re: Dumb question, nothing to learn here
fuze 1/4 watt.
Tube junkie that aspires to become a tri-state bidirectional buss driver.
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studiodunn
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Re: Dumb question, nothing to learn here
Thanks all, plenty to learn here