IWISTAO » IWISTAO
IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning
Vacuum tube FU50 is known as the small 300B and close to tube 300B, but the price is much lower than tube 300B, its treble is fine, extension is very good, overtone is excellent, and the vocals are very cordial. Listening to the original sound of the Dream of Red Mansions can feel that it is super strong; listening to symphony and string music is very good, violin is very delicate, more worth playing than the tube EL34.
The primary of tube amplifier output transformer generally has two, three and five connection terminals.
The circuits of single tube type class A amplifier Among them include:
- The primary is 2 connection terminals, P is connected to the screen, B is connected to B+ (that is, DC high voltage power supply)
- The primary is 3 connection terminals, P is connected to the screen, G is a Ultra-linear tap (connected to the second gate of the power amplified tube such as 6P6P, 6P1, 6P14, etc.), B is connected to B+ (that is, DC high-voltage power supply)
Many customers ask us about the sizes for installation, here we provide a table for you information.