- Jan 27, 2019
Here are my amps:
Sidebar 3: Measurements Following its preconditioning test, the Conrad-Johnson Premier Twelve was hot—typical for a tube amplifier. The bias was found to be slightly off during the distortion measurements, was recalibrated, and the prior measurements were rechecked to ensure that the results had...
I'd say typical volume on my CJ preamp is set between around 35 to 48 (if that tells you anything).
However...that's with the CJ running through the Benchmark Preamp (the Benchmark input is set at unity gain). That bumps up the signal gain hence I can hear a bit of tube pre-amp hiss through the speakers when running through the Benchmark, but not normally with the CJ straight to the amps. And straight to the amps means I usually had to turn the preamp up more for the same volume at the listening seat. (I'm forgetting my usual numbers when listening to the CJ preamp direct in to the amp, because it's been a while).
I did bring up in another thread that at one time I did a comparison of the CJ preamp run directly to the amp, vs through the Benchmark, and it *seemed* to sound a bit better (same volume at seating position) run to the amp, using a higher volume setting. I figured this was dubious, but it has also been pointed out that preamps can have a sweet spot in terms of their distortion characteristics with regard to volume control settings, so I still wonder if I might have heard something related - that without running through the Benchmark my normal CJ volume settings are closer to optimal operation (or just my imagination).