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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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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: 4P1L line stage posted by Brinkman on April 22, 2014 at 11:58:37:
Here is a photo of the second prototype. Across the front you can see the filament supply components. The large heat sink accommodates the Coleman current regulators for the filaments. The raw power supply sits just to the right, one channel's supply stacked on the other, and a pair of rigged PC mount filament transformers in the right front corner. The high voltage supply is fed by an R-core transformer and Triad choke (choke loading), raw supply and time delay, then shunt regulator. The 4P1Ls are each on a PC board with integral socket (using Mill-Max pin sockets) and the 13R cathode resistor (with filament current passing through it) on the heat sink. This board is not mechanically decoupled, but could easily be arranged that way with EAR-type stand-offs to minimize chassis-borne microphonics. Finally, the plate load transformers, which are Lundahl LL1692A/18mA.
This layout is probably not optimum, but it does illustrate the real estate necessary to get the job done at this level of performance. In the near future I will be be redesigning the raw filament supply and getting some beta boards for the circuitry together for a few of you to try.
Kevin Carter
K&K Audio
www.kandkaudio.com
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Follow Ups
- 4P1L line stage 2nd prototype - KevinC 06:43:11 04/24/14 (2)
- RE: 4P1L line stage 2nd prototype - Brinkman 09:23:04 04/25/14 (1)
- RE: 4P1L line stage 2nd prototype - KevinC 09:38:27 04/25/14 (0)
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