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Cap "breaker-inner"

Posted by 1973shovel on October 17, 2020 at 09:32:16:

Inmate Airtime and I were discussing capacitors, specifically Teflon capacitors, which are noted for requiring a notoriously long break-in period, often stated at 400 (or more) hours.
He sent me the above circuit, which is easy enough to build. But my question is, is 9 VDC enough to have any effect on the Russian FT series of Teflon caps, for example? Mike Samra used to post that the FT-3 200 volt caps were good at over three times that voltage. I've got some 600V FT-3 Teflon caps, and feeding them 9 VDC would seem like a flea on an elephant's ass.
Before anyone suggests "Just put them in the circuit and listen to them", if they do roller coaster in performance for 400 hours, it may be difficult to recall what the previous caps they replaced sound like. This device may help in that regard, but I'm wondering if I should apply higher voltage (increasing the voltage rating of the 22 uF cap, of course) closer to the working voltage of the caps being burned in.
Thanks.