IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning

2 comments / Posted on by Vincent Zhang

 

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. 

IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning

IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning (

This kit's solution uses 6J8P for gain amplification driving, FU50 as single-ended class A output, and tube 5U4C as tube rectification. Its output power is 2x8W. Don’t underestimate its 8w output, it is a Class A state, and much better than the digital power amplifier 50WX2 output and also more powerful than the LM1875's 2x25W.

 

This finished board is free tuning, you need just insert the vacuum tubes, and connect output and power  transformers. Also, kindly remind to connect your speaker to avoid damaging the output transformers before power on. The kits are made of fine materials and all imported high-voltage capacitors ensure safety and stability. All the seats are gold-plated to ensure good contact. High-power resistors use Panasonic, KOA and other advanced fever resistors.

 

Meanwhile, we provide the scheme diagram for you information. This is a channel of amplifier part below.

Scheme diagram of IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning

And, there is a power supply part below.

Power supply of IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning

Here is the tubes, FU50, 6J8P, 5U4C.

Tube FU50, 6J8P, 5U4C for IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning

 

After you insert the tubes into this small 300B amplifier board, you will get it as photo showed.

 

IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier Finished Board Kit Single-ended Class A DIY Free Tuning (including tubes)

 

More detail, please find, 

https://www.iwistao.com/products/iwistao-fu50-vacuum-tube-amplifier-2x8w-single-ended-class-a-pcba-finished-board-small-300b-diy?variant=13990706020467

2 comments

  • Posted on by walter tarantino

    dove posso acquistare questo kit

  • Posted on by walter

    dove posso acquistare questo kit

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