I did something stupid. I turned on my Dr Z head and turned off the standby. No sound was coming out and then I realized that I did not plug it in the speaker cab. I know that this is a no-no. I only had it running off stand by for a few minutes, and I don't think it damaged anything. I sounded fine to me.

What will happen if you run a head for too long w/o the speaker cab plugged into it?

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My gear.

Want to sell: Dr. Z Route 66

A SS head? Nothing.

A Valve head? You will (quickly/eventually)burn out your output transformer.

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My Gear , please wack with the side of your hand for normal service.
Bringing you EVIL VOODOO WAX MAGIC since 2009

Ad on a side note, if it doesn't sound damaged for now, then it probably isn't. It could have some minor damage that, over many years, might show up, but from my understanding of tube amps, you should get at least a few more years out of this amp of yours.

Just wait for olddawg to come along and quash my message of hope...

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The Machines

Nope, it should be fine. Everyone has done it once or twice. If you played it unplugged, reflecting back into the OT until it smoked, it would be a different story. I wouldn't make a habit of it though.

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Stage Guitars: '80s Thin line LP Custom, '70 LP Standard, '83 Squier Black Headstock Strat w/ Dan Torres pickups, '59 Black Danelectro DC, sometimes others.

Pedal Board: Nady UHF 10 -> TU2 -> Rocktron Big Crush -> 70s MXR Phase 100 -> Cry Baby -> Bad Monkey -> Early '80s Rat -> Early '80s Ibanez CS 9 -> Ibanez DE 7 -> Behringer Dr 100 Stereo Reverb

Stage amps: '63 Blonde Tremolux w/ two original 2X10 cabinets with a '60 Ampeg Rocket/18 watt VTB Marshall clone/ Epi VJ into a Mashall 1965A