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Old 17th November 2009, 03:31 PM   #1
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Default Inductor Circlotron

I got the inspiration for this Circlotron circuit from John Broskie's website: Tube Cad Journal. My version is a cascoded, balanced pair with center tapped chokes on both ends of the power supply. It seems to sim OK. Would love some input.
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Old 17th November 2009, 08:00 PM   #2
juma is offline juma  Germany
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It's an interesting balanced amp, but there is no "circle" in it, it's not a circlotron
You got just one PS and it's ground-referenced. Circlotron is basically a balanced push-pull with load across the bridge (as in Wien bridge, not as in "bridged amp"). Like this:
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Old 17th November 2009, 09:05 PM   #3
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I'll find article tonight after work. The large coupling caps become the second PS according to John's reasoning.
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Old 17th November 2009, 10:05 PM   #4
juma is offline juma  Germany
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Please do, I would like to read it. Broskie's explorations are great reading.
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Old 17th November 2009, 11:12 PM   #5
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The guy certainly has an imagination. Love his stuff.
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Old 18th November 2009, 02:12 AM   #6
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Here's the link: Safe vacuum tube amplifier design
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Old 18th November 2009, 07:59 AM   #7
juma is offline juma  Germany
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Yes, inductors make them float.
Click the image to open in full size.
Do you plan to build it ?
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Old 18th November 2009, 02:15 PM   #8
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Yes, I do plan to build upon this concept. I already have constructed a balanced, cascoded mosfet/power jfet amp similar in design minus the top choke and coupling caps. Basically, all I need to do is add the choke and caps and I'm in-like-flint.

In my sims I noticed that it's very important to have a small value resistor on the lower choke center tap. The LU1014Ds would fry otherwise. Also, a couple volts from a negative power supply seem to improve the wattage curve on the jfets.

What's cool is that it'll drive a 2 ohm load and deliver 100 watts, or more, in the process.

BTW, I should mention: the mosfets count must be quadrupled at a minimum.

Oh, and it takes 10 volts on the inputs to achieve 120 watts output.
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Old 18th November 2009, 02:54 PM   #9
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I just noticed that I used the incorrect value resistors on the inputs/ground resistor. They should read 100k, not 100. Also, if the mosfet count is increased, they should receive 0.1 ohm resistors at their source pins to insure proper current sharing.
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Old 18th November 2009, 03:40 PM   #10
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It is not that by the time you spend enough money to get reasonable chokes and PSU caps, you could also have used the same money for two floating Tx and caps, etc. ?


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