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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: K and K's PP 300B design with current sink twist posted by AnandR on October 9, 2003 at 06:54:56:
Allen Wright's hand-out schematic shows the use of an enhancement mode MOSFET with a battery bias arrangement. When the battery runs down (which takes quite a while), then...It turns out that you can use the K&K Audio CCS here and forget the battery bias. Depending on what tube you use, you may have to parallel multiple CCSs to accommodate the dissipation limits of the MOSFETS, but current sources (sinks) don't mind being paralleled.
Example: EAT 32B run at 100mA and 100v bias will result in 10w dissipation in the DN2540N5 MOSFET per tube. So for two tubes, two paralleled current sources with generous heat sink area will be necessary.
BTW, Allen gave a very good, entertaining talk at VSAC. He says that the gist of the talk will be in his forthcoming amp book. Recommended reading for those unable to attend VSAC.
Kevin Carter
K&K Audio
www.kandkaudio.com
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Follow Ups
- Re: K and K's PP 300B design with current sink twist - KevinC 08:31:27 10/09/03 (1)
- CCS heat dissipation - vry 03:40:01 10/10/03 (1)
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