Preamp output voltage?

The lower the output voltage the higher you will have to turn up the preamp to achieve the same volume as one with more voltage. And you will probably hear more noise from the amp and or preamp when the volume is turned way up.

1. Preamp output Voltages are only loosely standardized. The Outlaw receiver may well have as much unclipped output as the Adcom.
2. Preamps generally are rated by gain in deciBels. 20dB is 10 times Voltage. (Double or half Voltage is 6dB.) The line stages in old (say, more than 10 years old) preamps generally had more gain than modern linestage preamps. This matters only if you have too much gain or too little gain. The former will have you listening fairly loudly with very little twist of the volume control. The latter will have you not being able to play your system loudly enough even with the volume control full up. GENERALLY, one wants to run the volume control somewhere around 'noon' or higher, as that's where the stereo controls have closer interchannel tracking.
3. None of this has much affect on amplifier performance, S/N ratio, or listening quality as long as one avoids the too-little or too-much-gain situations.
4. The quality of the audio will be a result of overall quality of the preamp and NOT its Voltage output (as long as one avoids the too-little or too-much situations).

I suspect you're worrying too much about this. If you want the Outlaw, buy it--you'll have a month to return it if it doesn't meet your needs.
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you might be missing something since .76V output seems to me an absurd for any preamp.

Thanks for the helpful feedback! Yes, I do fret over minutiae before buying something new. Isn't that part of being an audio nut? :)

With the Adcom GTP-500II preamp, the volume knob travels from about 7 o'clock (zero volume) to 5 o'clock (max). Using my Adcom GFA-555II amp, usual listening level is about 9:30 or 10:00, 12:00 is uncomfortably loud, and the drivers on the KEF 104.2's are destroyed by 1:30. (That experiment was performed twice.) So based on the comments received here, perhaps a preamp with a lower output voltage would allow the volume knob to be safely turned up closer to 12:00.

Can anyone recommend any other surround receivers in the $600-$1200 range that might sound especially good as a pre-pro with the Adcom GFA-555II? I would like all of the current surround modes, but I don't need phono or video switching.

Here is a link to the review reporting the 0.76V pre-out voltage for the Outlaw 1070 receiver: http://www.hometheaterhifi.com/volume_12_3/outlaw-1070-receiver-9-2005-part-1.html