|
K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
|
|
|
K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
|
In Reply to: K&K pentode amp design questions posted by Francois G on December 8, 2004 at 15:37:24:
The power will turn out to be around 50w/ch, THD+ noise less than 1% up to 40 watts, and the gain is about 35dB with the interstage wired for about 1:1. If youu need less gain (6dB less), then you can wire the interstage for step-down (about 2:1). This has the added benefit of giving better behavior at clipping due to low drive impedance.
The wiring of the output transformer is just reversed from Lundahl's sheet. It has no impact.
You could add a volume control. Try 10K series resistors and a 50K pot.
That voltage needs to be about 320vDC.
A somewhat higher load impedance seems to result in a somewhat sweeter sounding amp. With a lower plate impedance you will get, of course, more power from the amp. You could substitute an LL1620/PP for the LL1663 and then try both 6K and 3.3K primaries and see what you prefer. Or you could use an LL1679/PP at 4.5K to split the difference.
Kevin Carter
K&K Audio
www.kandkaudio.com
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: K&K pentode amp design questions - KevinC 10:48:51 12/11/04 (1)
- Thanks for replies, Kevin and Anand (nt) - Francois G 10:39:35 12/13/04 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
