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Old 16th February 2012, 09:44 AM   #1
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Default 10m45s cascode diagram?

Yes, I have searched but not found what I was looking for...

Can anyone point me to a diagram for dummies on how to wire a pair of 10m45s in a cascode? I am currently using the singly in my SE amp but would like to try cascoding.

Thanks!!
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Old 16th February 2012, 12:51 PM   #2
euro21 is offline euro21  Hungary
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Default Cascoded

Voila!
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Old 16th February 2012, 01:09 PM   #3
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Voila!
I like that circuit configuration all around.
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Old 16th February 2012, 01:24 PM   #4
Magz is offline Magz  United States
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I think I'd put CCS fed gas regulator tubes on each channel instead of sharing them between channels to ensure against cross-talk, but I'm a bit prone to overkill.
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Old 16th February 2012, 02:32 PM   #5
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I think I'd put CCS fed gas regulator tubes on each channel instead of sharing them between channels to ensure against cross-talk, but I'm a bit prone to overkill.
Probably not needed, the cascaded CCS should provide excellent PSRR for each 12B4A stage.
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Old 16th February 2012, 02:54 PM   #6
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If you need more than 75 mA (power supply shunt regulators), this paralleled version works very well. There is benefit to having the 10M45 on top, as the DN2540 typically has a lower gate voltage for a given current. The more voltage you can provide for the bottom device the better off you are.

I place the 10M45 on the same heatsink, back to back on either side. The drains are at the same potential anyway, so no isolation requirements. I have also moved the zeners to the other side of the gate stopper, contrary to what is shown in the drawing.
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Old 16th February 2012, 02:56 PM   #7
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Thanks Euro21! Do the 10m45s have the same symbols for G, S, and D as a depletion mode mosfet?

When it comes to sand I am a bit new!
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Old 16th February 2012, 03:18 PM   #8
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Thanks Euro21! Do the 10m45s have the same symbols for G, S, and D as a depletion mode mosfet?

When it comes to sand I am a bit new!
The IXYS datasheet calls the terminals G,A,K which correspond to G,D,S i.e. G=Gate
A=Drain
K=Source

The TO-220 pinout is interchangeable with other depletion mode MOSFETs e.g. the Supertex DN2540
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Old 5th December 2012, 07:34 AM   #9
50AE is offline 50AE  Bulgaria
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Hi and sorry for the revival of an old thread.

I cannot get my cascoded 10M45S to work. The problem is, whatever the resistor value I put (80-300R), the current stays nearly the same (5-6mA). The circuit is used as CCS for a D3A tube and the target is 25-30mA.

Probably I could have screwed something by putting the two packages on the same heat sink without insulation (drain to drain)? When I did so, the current was quite high (50mA) and uncontrollable by the resistor value. Now when I isolated the 10m45s s, the current dropped to 5-6mA and is still uncontrollable by the current value resistor.

I use 1k for grid stoppers.
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Old 5th December 2012, 08:50 AM   #10
SY is offline SY  United States
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Replace the FETs (they're cheap) and double check your wiring.
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