Differential Headphone Amplifier schematic

K&K Audio / Lundahl Transformers

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In Reply to: Re: headphone transformer posted by G Brown on November 22, 2005 at 15:47:43:

Here is the schematic of the headphone amplifier. With the addition of some input switching it can be used as a preamplifier, as well. The overall gain is about 16dB as it is configured in the schematic. You can save some money by substituting the LL1689/PP (silicon iron core), but with some sacrifice of sound quality, of course. You can also use other input transformers like the LL1676 or LL1690 with very nearly identical results. I built the prototype in a Dyna FM-1 case with the Dyna power transformer (out of laziness). It is extremely quiet and has plenty of level for either my Sennheiser HD-600 or AKG K-271 headphones.
I will let some of the guys here who have heard this comment (if they see this post) , but I find it to be wonderfully transparent and dynamic.
With only the 6H30pi stage, the gain is woefully inadequate, so a direct-coupled input stage was necessary. To avoid the sonic evils of coupling caps, the two stages are directly coupled, but that requires some input stage plate voltage rebalancing as the input tubes are changed and perhaps as they age long term. I haven't found it necessary to make adjustments from month-to-month, so it appears not to be a big deal with good tubes.

Kevin Carter
K&K Audio
www.kandkaudio.com

http://www.kandkaudio.com/images/Differential_Headphone_Amplifier.pdf (Open in New Window)

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Follow Ups Full Thread

Topic - headphone transformer - G Brown 16:21:31 11/21/05 (8)

Re: headphone transformer - drubrew 04:50:59 11/28/05 (0)

Re: headphone transformer - KevinC 04:12:52 11/22/05 (6)

Re: headphone transformer - G Brown 04:31:59 11/22/05 (5)

Re: headphone transformer - KevinC 14:24:17 11/22/05 (4)

Re: headphone transformer - G Brown 15:47:43 11/22/05 (3)

Differential Headphone Amplifier schematic - KevinC 10:13:41 11/24/05 (2)

Re: Differential Headphone Amplifier schematic - Bergen4 14:06:37 11/25/05 (0)

Re: Differential Headphone Amplifier schematic - G Brown 15:56:59 11/24/05 (0)

Follow Ups

Differential Headphone Amplifier schematic - KevinC 10:13:41 11/24/05 (2)

Re: Differential Headphone Amplifier schematic - Bergen4 14:06:37 11/25/05 (0)

Re: Differential Headphone Amplifier schematic - G Brown 15:56:59 11/24/05 (0)

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