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Hoffman Amps Forum image Author Topic: Artificial center tap for my 5e3 build  (Read 1930 times)

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Offline Ledvedder

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Artificial center tap for my 5e3 build
« on: October 27, 2022, 05:55:59 pm »
My PT doesn't have a 6.3v heater center tap. Is it correct that I can just connect 2 100r resistors to the heater wires at the pilot light, then the other end of both 100r resistors to ground? Or to the tube side of the power tube cathode resistor for elevation?

Offline thetragichero

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Re: Artificial center tap for my 5e3 build
« Reply #1 on: October 27, 2022, 09:14:42 pm »
best bet is to connect to power tube cathode. you can usually solder the resistors right to the socket pins, although if there's a short it makes the resistors difficult to replace

Offline Ledvedder

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Re: Artificial center tap for my 5e3 build
« Reply #2 on: October 28, 2022, 07:03:26 am »
best bet is to connect to power tube cathode. you can usually solder the resistors right to the socket pins, although if there's a short it makes the resistors difficult to replace

Thanks! I found this after posting. https://robrobinette.com/5e3_Modifications.htm#Heater_Artificial_Center_Tap

 


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