The first electronic amplification of sound was done with Vacuum Tubes. We have pre-amp, power and rectifier vacuum tubes among other types in New Old Stock from the golden era of American & European manufacturing as well as current production tubes from today.
9 pin miniature preamp tube (Amplification Factor = 100). This is the ubiquitous Chinese 12AX7 with added selection. The gain is high and the American "Ruby Tubes" must be filtering out the noisiest ones.
Octal power tube (Max Plate Watts = 30W)
Starting at $18.25
5AR4 Ruby, Rectifier Tube
12AT7 Preamp tube, Ruby brand