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.
Vacuum Tube - 12AX7A-C5, Ruby Tubes
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.
Vacuum Tube - 6L6GC-M-STR, Ruby Tubes
Octal power tube (Max Plate Watts = 30W)
Starting at $18.25
Vacuum Tube - 5AR4, Ruby Tubes
5AR4 Ruby, Rectifier Tube
Vacuum Tube - 12AT7, Ruby
12AT7 Preamp tube, Ruby brand