Phil Allison wrote:
"Eiron"
Have we all stopped arguing? May I ask a question?
What's the best way to check if a power amp is likely to be stable
into a capacitive load such as an ESL?

** ESLs are not capacitive loads - that is an absurd myth.


I could put a 2uF cap on the output and look at the output on a scope
while feeding it with a square wave.

** Creates a load condition that does not exist with any hi-fi speaker.

Totally stupid.


One old Rotel amp has a warning in the manual against capacitive loads,

** Can you quote the actual wording ?

http://www.rotel.com/content/manuals/ra930ax_eng.pdf page 2
"Do not use speakers that have very high capacitive load,
say over 0.1 microfarads, as it may cause a damage to the
power amplifier section. Normally, most speakers are low
capacitance type, but there are a few which do have
excessively high capacitance."

No other Rotel manuals seem to mention that, so the RA930AX must be a lemon.

Probably best not to risk it. Plenty more amps in the junkroom.

--
Eiron.