Are you looking to repair an old device with a new set of tubes?
TubeDepot has an excellent tool for tracking down the correct Vacuum Tubes for your guitar/bass amp, home audio amplifier, organ or recording gear.
yes its a very old guitar amp. it doesnt even have a makers name model (they have worn off with age and use I imagine),so I cant find a schematic.I have all the other tubes , but one has no markings at all.
Hello @mikecasey,
You question was answered here.
This Tech Tip may help you identify the tube.
Tech Tip: The tube identifiers (markings) were often included on the glass bulb. With age and aggressive cleaning, these marking are rubbed away. An old technician’s trick to blow on the tube. The condensate in your breath may reveal the markings. It will be faint but, if you are lucky, clear enough to be read.
Sincerely,
Aaron