I'm building a sort of universal tube filament power supply. It will have a constant current and a constant voltage mode, for series and parallel filament supply, value selecvtable by a multipole rotary switch.
Now, I have already selected the constant current ranges, for most of the standard series strings:
100, 150, 300, 450 and 600mA.
The standard voltages present more of a problem. What would be the more common standard filament voltages, apart from the usual suspects, these being 1.4V/1.5V, 2.8/3V, 5V, 6.3V and 12V?
I have looked at various tube tester manuals for this, but the higher voltage ranges are usually geared towards tubes intendedfor series filament connections, which I have already covered with constant current mode operation.
Anyone care to post some additions to either the current or voltage list?
Now, I have already selected the constant current ranges, for most of the standard series strings:
100, 150, 300, 450 and 600mA.
The standard voltages present more of a problem. What would be the more common standard filament voltages, apart from the usual suspects, these being 1.4V/1.5V, 2.8/3V, 5V, 6.3V and 12V?
I have looked at various tube tester manuals for this, but the higher voltage ranges are usually geared towards tubes intendedfor series filament connections, which I have already covered with constant current mode operation.
Anyone care to post some additions to either the current or voltage list?
One suggestion: Redefine the project to be a lab power supply with adjustable output voltage. Have a mode on this power supply that turns it into a current source with a variable output current. Something like 0~30 V, 0~5 A should cover quite a bit of ground, I'd think. Add a couple panel meters showing voltage and current and you'd have yourself quite a lab supply.
I seem to recall seeing tubes with 25.2 V filaments...
~Tom
I seem to recall seeing tubes with 25.2 V filaments...
~Tom
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