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In the Forum: Melquiades Amplifier
In the Thread: Bias help
Post Subject: The OPT’s gap and the choke inductancePosted by Romy the Cat on: 6/13/2009
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Dominik.
There is one more factor that I forgot to mention. When you will be looking at your choke for your B+ of the output stage then relate it critical current to the amount of the mA that you asked the Tribute guy to guy your transformer. If Tribute gives you 10H at 350mA then Tribute uses a VERY good chunk of amorphous iron. I doubt that Tribute would as the cost of such a size of amorphous lamination would be around $350 alone. Still, if you are planning to drive across this transformer 300-330mA then this would be the current the will flow across your poser choke and the inductance of the choke you would need to calculate accordingly. If you have a high sensitively and would drive Milq from a half of 6C33C then you will be at 150MA and you would need more inductance in choke. I do not know what voltage are you planning to use but if it is 200V (that I feel optimum) then you would not need 350mA, 270mA would be much better for both plates. For Tribute it would not be a big deal to change the targeted current (it will be just a different thickness of gasket in gap) but for you a lower current might mean a saturated choke. So, the common rule of choke value calculation is to stay with double of critical inductance but in your case I would recommend to stay with quadruple of even more inductance. It would not really heart…
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