The (relevant) installed base is nowhere near that number. I tried to address your question a while back, but the reply ended up in another thread:
Excluding ON, the total revenue for wafer-level products in the last decade (40 quarters) is somewhere around $105 million. This number is an estimate, and includes contactors and services.
By 2008 the installed base of the FOX product line was around 125 systems, of which I presume the majority was FOX-1 (single wafer/slot). I’m not aware of any more recent disclosures, but the total revenue puts a limit on how many systems they’ve sold since then.
The language used is somewhat misleading in my opinion. But it’s now removed from the latest 10-Q/10-K. Unfortunately, so is the part about naming their >10% customers, which means less transparency and more unknowns with regards to customer concentration from now on.
Should note that it’s easy to underestimate the throughput of these systems. E.g. at 12 hours per cycle, ~75 FOX-XP systems would give you a capacity of one million wafers per year. A move from 150 mm to 200 mm wafers would reduce that to ~40 systems to cover the same demand.
(No position in AEHR )