2. amps-preamps
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Is it real or just my imagination?

I recently checked and re-biased my ARC VT100 Mk II power amp. Tubes had not been re-biased since new, and the hours had reached around 500, so I felt it was time to check and adjust if necessary. Spec is 130. One channel measured 128, and the other 125. I set them both to spec, closed the amped, and took a listen. I was surprised to find that the amp sounded more dynamic, more "alive". I was surprised that this small a change in bias would make a clearly audible difference. Any body else have a similar experience ?
mabonn

Showing 1 response by czarivey

czarivey
5,754 posts
 
Using imagination is fun.
Descrepancies in few single millivolts should not show drastical changes, but just like Al said you can 'improvise' to reach the sweetest spot of bias alais from specified in manual by experimenting updowns just like you would do by analogy with stylus VTA/VTF settings.

After all your amp shows good build quality and design. Tubes being able to hold bias within tolerance boundaries after 500hours and more likely to stay strong after another 300.
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