Dc voltage sent to my speakers

@atmasphere  My experience with tube preamps is very limited, but the one or two that I played with had a tiny bit of DC on the output.  In the range of 5mV or less.

Should also note that SS amps also may suffer from small imbalances, usually under 0.1 V though.

@ketchup - Even with the best caps there can be some leackage, but usually in the microvolts ( < 1 millivolt ).

Yes, it's very common for the output caps to leak DC and need to be replaced.  Not saying everyone's caps will fail, but that this is a very common reason techs see tube preamps. 

If you want fancy amplifier output protection you need to stick to Class D. 

Not really joking but looking at the Hypex and ICEpower spec sheets they have a lot of fault detection and shut down circuitry built in that most linear amps never even think of.  Maybe the need to target pro sound helps them build paranoia into each amp?

Oh, forgot one, often BJT amps will also have some sort of thermal runaway protection.  Otherwise, no I haven't seen a lot of SS amplifier schematics with "turn off on DC" on the outputs.

But, I'm not a tech, just a hobbyist who stopped pouring over schematics a long time ago.

Most solid state amps have a protection circuit to prevent damage to the speaker in case of output section failure

Um, not the one's I've seen especially "high end" amplifiers that pride themselves on not having any.

It varies a lot by make and model IMHO.  I've seen plenty of schematics with just fuses and an anti-oscillation circuit on the outside.

@mulveling is correct in all counts.

The amplifier transistors swing the output voltage between 0 and one of the two power rails (plus and minus).  Anything from bad input, to a shorted transistor along the way could cause the output voltage to stick to the rail.

Fortunately you can use a voltage meter to check this.  Set it to DC and measure the amp outputs with no speaker attached.  First with the preamp off.  If you have more than a few millivolts it's probably the amp.