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AV20

Posted by Jim Dowdy (M) on December 27, 2009 at 07:51:10

In Reply to: RE: Questions about the Dowdy Plate choke.. posted by Jeff Davison on December 26, 2009 at 12:56:00:

Jeff:

While it has a number of other nice applications, the Dowdy plate choke was originally designed for the AVVT forerunner of the EML 20B, the AV20.

The op points I ended up with for the AV20: B+ of 395 v (plate-ground), with an R(k) of 195 ohms (paralleled pair of 390 ohm 1 Watters). This provided about -7 v bias, drawing approx 36 mA.

BTW: I have successfully used the AV20 at lower plate voltages (approx 300 v), but you are throwing away some of your gain when you get much below 375 v.

I have no experience at all with the EML20B, but I believe the tubes are similar enough that this may offer a bit of help along the way.

Happy holidays to all!

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