K&K Audio / Lundahl Transformers

Re: choke loaded plates

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In Reply to: choke loaded plates posted by thermionic addictions on June 19, 2006 at 14:39:26:

The big deal here is to make sure that the choke has enough inductance to provide adequate low frequency response in interaction with the tube chosen. The easy way to calculate the approximate low frequency limit here defined as the -1dB point is to use the following equation:
Frequency (-1db) = parallel combination of the anode resistance of the tube and the load resistance divided by the quantity, anode choke inductance times 3.14 (pi)
You can ignore the load resistance, if it is more than 10 times the anode resistance of the tube.

Kevin Carter
K&K Audio
www.kandkaudio.com

Follow Ups:

OK after playing with the math a little bit.... - thermionic addictions 11:24:40 06/20/06 (2)
- Re: OK after playing with the math a little bit.... - KevinC 14:37:57 06/20/06 (1)
  - Very cool kevin. Thanks for the excellent answers. (nt) - thermionic addictions 14:55:20 06/20/06 (0)
Thanks Kevin. That is exactly what I wanted to know. - thermionic addictions 08:50:26 06/20/06 (0)

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