Why so many Plinius for sale lately

This may also be a reflection of the popularity of the amp a couple years ago when it first became critically acclaimed. A lot of people who bought them then are ready to move on to something else or have tired of the sound.

I'm impressed with my SA 100 Mark 3. Sounds very
tubey,low end detail is stellar,nmanhandles the
bass and for the price a bargin. (1500).
More than any amp I have ever known it must be a
perfect match to the pre used. It is very
high gain almost a live wire so either use a good
passive pre or a Plinius pre for best results.

Probably the one important weakness of Plinius amps is its high frequency extension which is relatively rolled off/muted, so you do not really hear the crispy sparkly sound of live instruments.

The first SA 100 did have problems with hum which was addressed I believe in the Mark III. The Mark three had two separate toridial transformers one for each channel.

Pliniophobia.