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In Reply to: Different heater/filament voltages from same tranny. posted by thermionic addictions on March 22, 2007 at 12:52:39:
The resistor method works well save the heat generated. My approach now is to install some diodes and rectify the winding for DC.
Do you think you have enough current capacity on that particular secondary transformer section to install a simple bridge and filter capacitor to generate 2.8VDC? Maybe you can also install a light bulb in series with the input tube filaments to create a voltage divider? But then there are the issues with polluting the AC 6.3V with rectifier noise maybe, etc.
Follow Ups:
As said, run the output tube AC and rectify the 6.3v for the driver DHT, giving you about 10vDC which you can then turn into a current source using a Ronan Reg type design. If it's 2.8v it sounds like a double triode, and if it has the alternative of running at 1.4v you may find that's easier to achieve with a current source.I tend to double up where I can - e.g. if I have a 12v heater winding I rectify that for a -15vDC supply to the CCS.
come up with.Yes Andy the input tube is a double triode the 3A5, cute little
tube I just gotta try it.By the way do you know where I can find a schematic for the ronan
reg? I googled and searched the archives and came up empty.
Cal - mailed you details. Andy
I will give this a try, it looks interesting.I truly appreciate your help.
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