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Re: Line Stage Kit

Hello PPT,

You are right, the 6N1P is an excellent tube for this application. I chose it after listening to many alternatives.

The circuit is fully differential, input to output, and can be used with either balanced or unbalanced inputs or output. To interface with an unbalanced input or output simply ground one side of the transformer, so the gain is independent of whether the inputs and outputs are balanced or unbalanced.

Most folks have way too much gain in their system and end up throwing it away in the volume control. The 5dB is a conservative number and I chose the design point to allow sufficient gain and at the same time provide a good range of adjustment of the volume control. I have never run it at full volume in my system; on the other hand I do not have to settle for a volume adjustment between 7 and 8 o'clock.

Overhead is a design parameter separate from gain. Even if the gain were to be 0dB, you would need adequate overhead to handle the largest signal you expect to see. When used together with the associated Raleigh Audio power supply, I have been generous with the amount of overhead provided and made it easy to increase it further if needed.

Dave Davenport

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