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Old 2nd March 2013, 01:58 PM   #1
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Default Triode for 60V

Hello Guys,

I'm new to the subject so forgive me if I'm asking something trivial or unusual. I'd need a tube for a PWM project that could switch 1us pulses/1ms delay with <25ns rise and fall time at 60V. I don't know what current triodes can carry but I'd like to put through 5A or more.

Is that possible with tubes? If so, what model can do that?

Thanks in advance
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Old 2nd March 2013, 02:03 PM   #2
FoMoCo is offline FoMoCo  United States
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While I'm sure someone can find you a tube that will do this, this just screams MOSFET as the "proper" choice.
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Old 2nd March 2013, 02:24 PM   #3
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Why would you use tubes ?!

<25ns rise and fall is not so easy to achieve. Use modern, advanced MOSFETs with even more modern gate drivers.
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Old 2nd March 2013, 02:39 PM   #4
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This would be a DIY vacuum tube project I'd like to build for comparison with an equivalent solid state solution. The solid state circuitry has already been built with a fast IGBT and 9A peek current gate driver.

Last edited by agentgates; 2nd March 2013 at 02:39 PM. Reason: typo
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Old 2nd March 2013, 02:55 PM   #5
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Quote:
Originally Posted by agentgates View Post
Hello Guys,

I'm new to the subject so forgive me if I'm asking something trivial or unusual. I'd need a tube for a PWM project that could switch 1us pulses/1ms delay with <25ns rise and fall time at 60V. I don't know what current triodes can carry but I'd like to put through 5A or more.

Is that possible with tubes? If so, what model can do that?

Thanks in advance
No. Tubes typically operate at mA levels.
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Old 2nd March 2013, 03:11 PM   #6
DF96 is offline DF96  England
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Thyratrons? Paralleled line output valves (sweep tubes)?
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Old 2nd March 2013, 04:12 PM   #7
JMFahey is offline JMFahey  Argentina
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Quote:
I don't know what current triodes can carry but I'd like to put through 5A or more.
Forget it.

Quote:
This would be a DIY vacuum tube project I'd like to build for comparison with an equivalent solid state solution. The solid state circuitry has already been built with a fast IGBT and 9A peek current gate driver.
Well, you already know the answer for that comparison: SS rules.
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Old 2nd March 2013, 04:38 PM   #8
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Quote:
Originally Posted by agentgates View Post
Hello Guys,

I'm new to the subject so forgive me if I'm asking something trivial or unusual. I'd need a tube for a PWM project that could switch 1us pulses/1ms delay with <25ns rise and fall time at 60V. I don't know what current triodes can carry but I'd like to put through 5A or more.

Is that possible with tubes? If so, what model can do that?

Thanks in advance
The voltage is quite low and the current quite high for tubes. Still, you could try transmitter tubes or indeed paralleled line output tubes.
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Old 2nd March 2013, 05:50 PM   #9
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Thanks guys, I'll have a look at the thyratrons.
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Old 2nd March 2013, 05:56 PM   #10
Ketje is offline Ketje  Belgium
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For that kind of signal I think the solution is more something like a line-out transformer(CTV) and p.ex. an 811A.With 1500V power an output over 300W and a secondairy winding 60V 5A.I don't now if it can be done,just an idea.
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