In short, no...
yaqin 100b kt88-98 bulb blown and smoking coming from the amp. removed the valve and the amp is still working. will i be ok to play the amp with 3 kt88 valve or will i bust the amp. what valves are cheap and worth replacing the kt88. kind regards mr young
Smoke coming from any item of electronic gear is a
BIG red flag! IMHO, you shouldn't even plug it in to the mains until you have determined what smoked and why.
As for replacing the tube, your amp is a push-pull design. As such, it needs
both KT-88's (or whatever) to operate properly. It might put out sound with only one - but likely nothing you will want to listen to for very long.
Also, if you just buy a replacement tube and plug it in the amplifier will likely still not sound right. There are internal adjustments on that design that are used to balance the circuit - any time you change a tube (or pair of tubes) those adjustments need to be tweaked. All tubes are slightly different, even from the same tube manufacturer, which is why the amplifier manufacturer provides those adjustments.
You will first need to troubleshoot and fix the original problem (smoke), then replace the tube (you might need to buy a matched pair to get it working properly), and finally adjust the bias (inside the amplifier) to get the unit back to the performance standards you paid for.
If you do not feel comfortable working inside a unit that has exposed 400+ volts (which is quite dangerous and
can be deadly if you touch it), I would suggest you take the amplifier to a qualified repair shop and get it fixed properly.
If you decide to try it yourself, you will also need some basic equipment such as a voltmeter, amplifier schematic diagram and service manual, parts to replace whatever smoked, soldering iron, etc. to do any work inside the unit, and you will need to know how to use them.
Good luck - and
please be safe!
~ Sam