Its a old radio amplifier tube. I wonder if I can use it for anything at all but It was so neat I couldnt stop myself from buying it. Hopefully I can use it for a tesla coil. Any ideas. Its Thomson-CSF TH 4T4100.
Can't I use my modified microwave transformer to feed the filament voltage. I got a full bridge rectifier rated for 1000w connetcted to it and It should have a 12 volt output.that's a pretty hefty filament supply you will be needing.... 12.6V@35A. 440W center tapped filament transformers are not a trivial piece of hardware...
Is the bridge rectifier itself rated for 1000 Watts of power dissipation? Or is it that the product of the Amp Voltage rating is 1000 Watts? I'll assume the latter.Can't I use my modified microwave transformer to feed the filament voltage. I got a full bridge rectifier rated for 1000w connetcted to it and It should have a 12 volt output.
Is the bridge rectifier itself rated for 1000 Watts of power dissipation? Or is it that the product of the Amp Voltage rating is 1000 Watts? I'll assume the latter.
But the real question is what is it's rated current? It won't work for the filament supply if it's rated for 1 Amp @ 1000 Volts.
That said, do you really need a rectifier at all? The datasheet doesn't say that the filament needs DC. I've not worked with tubes much, but the few that I've looked at all used AC for the filament.
You are right, probably I dont need a rectifier. The problem with my microwave transformer is even I got 12 volts output It will drop alot when underload so Its impossible to get exact 12.6 volts. Can I use a pc power supply rated 35amps at 12 volt line, since I am not going to use this at full 2Kv power I assume the flament can run at little bit lower 12volt range or even 11.5volts or it must have that exact 12.6.Makes no real difference, but AC was generally used as it's obviously simpler and cheaper - 'occasionally' DC would be used, so as to reduce any hum from the heater wiring.
One obvious use for DC heaters was the antique AC/DC radios etc. where if the mains was DC the heaters obviously ran off DC, but if the mains was AC then they got AC power instead. Funnily enough I've got an old HMV radio to look at currently - which uses U series valves, with 100mA series heaters.
So it needs 12.6 volts under load, then the unloaded voltage may be a little bit higher ? I saw people using a resistor to slow start the flament do I need something like this and most importantly can I use this to power a tesla coil.If you run at lower heater voltages valves run poorly, or not at all - as you're winding the transformer yourself, tweak the number of windings accordingly, so as to give the correct voltage when under load (which is how transformers are specified anyway).
I dont know much about vacuum tubes. But I have seen some vacuum tube tesla coil designes. Is there any thing I can do with this except making a decoration item anyway.I've no idea about tesla coils, or what they require - but as far as I'm aware they don't usually use transmitter valves?. Bear in mind you would be wasting about 400W just on the heater.
They were selling little versions of this too. Maybe I should got one before messing with this bad boy.I would have thought a nice decoration is probably the best use for it?.
Even for it's intended use it's too high a power for amateur radio use - and to honest, 400W wasted just on the heater is far too much in these energy efficient days.
The H.F. heating equipment I used to work on used a huge transmitter valve/tube for the oscillator.
The cathode heater was 3kw. !!