On Mon, Mar 5, 2018 at 08:16 am, Clark Martin wrote:
But connect an amp output to the ring terminal will still burn it out if you plug in a mono plug, regardless of bridge or parallel.
You are correct, Clark.? This needs to be said loudly to any who might plug a TS connector into TRS jack, much like there are warnings about connecting power supply voltages backwards.
A little experiment was conducted:? My ?B has an FCI TDA and a regulated 12V power supply.? When there is a dead short at the phones jack and the volume all the way up, the TDA gets too hot to touch (~130°F/55°C for me) within a few seconds.? With the volume turned to ?, I can hold my finger on the TDA for at least 30 seconds without any noticeable temperature rise.
This is only one data point, but it suggests that FCI TDA is robust against shorting at ? volume for some time.
If I had a few more of them and a socket, I would intentionally drive one to failure just to see what happens.
Arvo W0VRA