Did I blow my tube amp?

Thanks guys for the inputs so far. I must add that the amp I have is not a Manley, I'm just following the steps in the youtube video, which had a Manley Stingray in it (I think it was EveAnna Manley from Manley Labs that did the biasing).

I know that some manufacturers recommend having speakers connected at all times before turning on an amp, but I also know that for Cary amps it don't matter. In my case though, the owner before me had it on once without speakers connected, and it was fine after he passed it on to me.

I checked all connections several times, even swapped in a solid state amp and music played normally at the speakers. I even had experience turning on a Yaqin tube amp before without speakers connected and it was fine after. In my case, there was no input signal connected at the time of the biasing, so there should be no load and the output transformer should be at idle.

The amp still turns on and all tubes lit normally, just no output at the speakers. The tubes usually get really hot when playing, but they seem to be just idling without getting hot. Would a dead fuse cause this?

Purposely withholding the name and model of the amp will not get you any meaningful info.

Hi all ! The VTL amp I had said to connect the speakers for biasing. My Cary amp says doesnt matter . Call Manley and ask .

Jea48, Regarding your comment "(Dumb way to build something)". The output transformer case may be grounded. Most people use terminated speaker cables eliminating this problem.

Also, powering up a tube amplifier with no load is very hard on output tubes and stresses the amplifier. Youtube is good for some things, but apparently not for biasing tubes.

Normally, when I bias a tube amp, unless the manufacturer says to have a load on the output, I don't. I do however, have shorting plugs for the single ended inputs. That way I know there is no signal going through the amp while I am biasing it and therefore not driving a signal through an unloaded output transformer.