For sale is a fully functional GUYATONE FLIP100FJ. The FLIP series, still popular today, uses two 12AX7 vacuum tubes in the PRE amp section, one for NORMAL and one for DRIVE. It seems to be a model from the late 1980s, and the original price was 29,800 yen, made in Japan. The switching between NORMAL and DRIVE is done with a switch on the back, which is a bit inconvenient, but the sound of NORMAL is quite good, and I used it by distorting it with a pedal effect. The SP-2015 speaker from that time was also popular! Two NATIONAL 12AX7 vacuum tubes from that time are used. The vacuum tubes still seem usable. Made in Japan Voltage: 100V Frequency: 50/60Hz Power Consumption: 29W Output: 15 Watts Controls: GAIN, VOLUME, BASS, MID HIGH, PRESENCE DRIVE/NORMAL DUAL MODE SW, INPUT JACK, HEAD-PHONES, LINE OUT AC/DC switch, Power-SW, PRE AMP vacuum tubes NATIONAL 12AX7 X 2 SN: 6333583 Size (cm): Width 33.6cm, Depth 18cm, Height 33cm (including carrying handle) Weight: 6.2 kg Please feel free to ask any questions you may have, and I will answer what I know.