I have a DVA Digital Preamp, which replaced an AVA Vision Hybrid DAC. I sent the old DAC back to AVA to sell, and the prospective purchaser returned it saying there was a slight hum in one channel. I asked Frank for AVA to diagnose and repair the old DAC, and he replied that he didn't know where to start. In over 50 years of owning AVA components, I have never before had that level of support, previous repairs have always been completed promptly. I wonder if existing employees no longer have the necessary skills that AVA had in the past.
I'm not entirely sure I'm following what you're asking about here. As I pointed out in my earlier reply, the decision to phase out "in-place" upgrades wasn't (and isn't) about available skills but rather about real-world economics. It's no longer cost-effective for either our clients or ourselves to offer "all new circuits" in user-provided chassis -- which is I think what you wanted to see return. In fact, one of the reasons we started our
Brokerage service was to help ease the transition for our clients, and we'll continue to support it as long as it works for everyone.
If you're introducing a new thought with this post and are questioning whether we have the needed skills to repair the gear we sell and have sold, we do! Our service lead has been with AVA for
decades and is a veritable walking encyclopedia of all things AVA. Sometimes, however, when something is really, really old, suitable replacement parts may no longer available in our inventory or from suppliers. In these cases, there's no reasonable way to bring a unit back to working order.
However, the Vision Hybrid DAC isn't all that old. If Frank had difficulty resolving what was ailing it, I don't know why that would be. It's possible that a small amount of right channel hum was endemic to the design. (This is pure speculation. My involvement with this unit was limited to designing and laying out the solid-state DAC core, which I did while I was living overseas. I had nothing to do with the hybrid output stage layout. By the time I returned, the unit was obsolete.) So, Frank may not have known where to start because it performed no different to previous units, and the noise may not have been an issue for anyone before.