2. amps-preamps
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Is preamp remote volume a deal breaker for you?

I've been looking for a quality active tube preamp with remote volume control. Most high quality tube preamps that are reasonably priced (ie, under $4000) do not come with remote volume. Those that do use the cheap motorized Alps pot (I've had bad experience with Alps), probably because it's cheap and widely available. I've seen some very expensive preamps us this pot, unfortunately. The two very high quality preamps I've read about are the SAS Labs 11A, Don Allens preamp, and Atma-sphere M3, but the designers refuses to implement remote because they believe the sound will suffer. Atma-sphere uses a huge hand assembled remote volume only for there expensive MP1. A preamp without remote is a deal breaker for me. How about you?
dracule1

Showing 3 responses by almarg

almarg's avatar
almarg
9,670 posts
 
07-26-11: Atmasphere
The standard for balanced line is the output of the device driving the cable should be able to drive 600 ohms or less (in the case of microphones) without degradation (this calls for a fairly low output impedance BTW). If the cable is terminated at the input of the amp with a 600 ohm load, then you will hear no difference between a high end cable and a cheap one, ours, or one from Radio Shack.... If the termination is not installed, then cable differences appear.
Ralph, I'd be interested in an explanation of why the termination is necessary. Why wouldn't simply driving the balanced cable with a low impedance driver be sufficient? Obviously less current would flow through the cable if the termination is not present, but I'm not sure why that would make a difference.

On an unrelated note, congrats on your re-done website. Looks great!

Dracule -- in my case, not having a remote would not be a deal-breaker. I have one at present, but I could easily live without it, as I did for many years in the past.

Best regards,
-- Al
almarg's avatar
almarg
9,670 posts
 
Thanks, Ralph. That all makes sense, as I see it. I would add, though, that the values of those cable parameters, and their effects, will decrease as length decreases. I would therefore expect that in the case of a short cable, say a few feet long, and if the cable is reasonably well designed and is driven from a low impedance balanced output, that those effects would be insignificant both with and without the termination.

Best regards,
-- Al
almarg's avatar
almarg
9,670 posts
 
Thanks, Kirk. Good points, of course. Re the two adverse situations you indicated as being most likely to occur when a 600 ohm load is used, those reading this should note Ralph's (Atmasphere's) reference to the need to be able to drive 600 ohms "without degradation." In other threads he has made clear that "without degradation" includes having insignificant effects on frequency response and distortion, a condition which will not be met by many (and I suspect most) preamps and source components.

Tim (Timlub), thanks for your kind comments.

Best regards,
-- Al
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