The future of preamps

@ Atmasphere, Hi, Just got my call back from krell, they said, If you have it in writting in your manual or other wise that your preamp will not emit Dc at all, its all good to protect my investment!, He did want to know what kind of volume control you use, He also said, If its the old school pot volume control, it would not matter since you have dither controls for the gain, He said I should be able to ajust to match the amp, he preffered discrete attenuator volume control, meaning, has digital support, they veard off from the usual pot volume control for better out come of sound, what say you?, thanks Ralph.

The volume control in the MP-1 is a custom-built switch with gold contacts and dual wipers to insure contact performance. It has 4 decks so we can control each phase (inverted or non-inverted) as well as both channels.

@ Atmasphere, Thankyou for your reply,I will try to give you a phone call after new years to find out the closest place for me to hear your preamps and if you have documentation saying that your preamp will not emit Dc into a amplifier. Happy new year!

Audiolabyrinth, no preamp manufacturer would get very far if their preamp had DC at its output! Any preamp manufacturer has to deal with the fact that their preamp will be used with a transistor amp that is direct-coupled from input to output.

A DC level at the output can cause all sorts of problems, and not just for transistors. If a tube amplifier has a direct-coupled input (our amps do and many others do as well), a DC level at the input would cause the input circuit to make distortion and could adversely affect gain.

So it is simply something that preamps don't do! That is why I said earlier that Krell was promoting a myth.

Preamps, *all preamps*, do not have DC at their output. It does not matter tube or transistor.

So the Krell person you spoke to who is looking for 'documentation' need look no further than this post. No manufacturer in their right mind would make a preamp that puts out DC. It is literally that simple.

If you have it in writting in your manual or other wise that your preamp will not emit Dc at all, its all good to protect my investment!

Audiolabyrinth, I suggest hiring a team of lawyers to review the manual and getting it in writing. LOL!

I've used tube pre with ss amps for years and never had a problem. These are not your grandfather's tube pre. LOL!