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Chokes are simply problem solvers, not tweaks

Posted by Chip647 (A) on December 11, 2014 at 05:14:07

In Reply to: Also, how do you determine what mA rating to use? posted by vinnie2 on December 11, 2014 at 03:26:40:

Look at the total demand downstream of the choke to determine the minimum rating. If you have a 100mA going though your output tube, 20 through the drivers, a 5mA bleeder resistor and some winding losses in the output transformer, that channel would need a minimum of 130mA.

Now, running a choke rated for 130mA at 130mA is almost guarantee of hum from the choke itself. If the choke was feeding 2 channels, that is 260Ma minimum rating. I have found that 50% above minimum or more has the best shot at making the choke quiet.

See the link below to Henry Pasternack's post on chokes.

For me, if the choke has the inductance and is quiet, it will work. "Low DCR" chokes simply mean they are either non-critical (very low inductance) or massively overrated for current.

• Henry's Explanation   (Open in New Window)

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Analog Engineering Associates

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