Jim Lesurf wrote:
In article , Nick Gorham
wrote:

Rob wrote:


It strikes me that the valve amp is the problem here - SS amps don't
need a dummy load. Really, your suggestion is fine. I'm just trying to
factor in certain extreme scenarios - say, someone else using the
stereo.




Don't bother if the amp has triodes on the output, its only Pentodes
that will get upset with no load.


Can you explain why? Afraid I don't know why an amp built with triodes
would be inherently incapable of becoming unstable when unloaded.


No reason why it shouldn't become unstable, but the fact remains that a
triode is happy with a choke load, which the transformer (ignoring
OTL's) will become when unloaded. The pentode will not however like that
load and you can end up with high dv/dt that could cause problems in the
output TX.

--
Nick