300B single-ended Class A tube amplifier – amplifier board, immersion gold PCB, kit

If you choose 225 yuan, the board kit is only the components on the board and does not contain tubes. The boards with both price options need to be welded by yourself. If you weld the finished board on behalf of you, add 55 yuan.

From the 6SN7 power supply here AC line, one of the leads to the chassis grounding, can be very good board to improve the signal to noise ratio, power amplifier is very quiet! Do not make a mistake, PCB VCC printing and output transformer B pin corresponding connection.

Choose 2568 yuan, which is a complete set of kits, including 2 Noble 300B, 2 Dawning 6N8P, a 5Z4P Dawning tube, 1 chassis (open the transformer installation hole by yourself), 2 output transformers, 1 choke, 1 power transformer, 1 type 27 potentiometer, 2 CMC816, 6 crystal horn pillars, related screw connectors, excluding cattle cover

The weight of the full set is about 18-20KG. Contact customer service to change the price when you place an order. It is recommended that Debon Logistics freight yard pick it up by itself.

The resistance and capacitance parts used in the 300B machine of 2000 yuan on the market are very general, and the output cattle do not use high-end films like Z11, and they are also very small with imported tubes, which is difficult to play the advantage of 300B

The matching chassis is shot here, and the tube outlet hole has been opened. The transformer hole needs to be opened by yourself, and the opening of the transformer provided by individual customers is different.http://item.taobao.com/item.htm?spm=a1z10.3.w4002-1582430503.19.CgU1V2&id=40317587420

renderings

This is the renderings (made by netizens Ye Sheng)

The architecture of the kit is 6SN7 + 300B single-ended output form, and the adjectives of bragging do not need to be expressed more, which will not disappoint.

300B has always been used by many people to build a shed, the project is large, the wiring is too much, the reliability and performance are affected, and the appearance is not good-looking. With well-made PCB production, these difficulties can be completely solved. Because there are not many components that are free of debugging, it is almost the same as the difficulty of manufacturing an LM1875

1.6SN7 + 300B single-ended output form design, the most original classic 300B solution.

2.2.0 mm high quality gold/lead-tin black printed circuit board (203 * 134mm), copper thickness is double copper, weight: 456g

3. Extremely high signal to noise ratio, quiet background

4. The circuit is free of debugging and easy to make.

The coupling capacitor is made of the best French SCR Surun capacitor with the best human voice, and the 300B tube seat is also the best 95 fine ceramic special 24K gold to ensure the perfect performance of the circuit. See the bottom of the page for detailed materials. This configuration is better than many expensive finished machines.

The voltage parameters of each terminal have been marked on the board, and the transformer can be seated correctly (the filament power supply of 5U4 is changed to 5V). The 2 points marked with L are connected to the choke

Common sense note:

1. The output transformer cannot be turned on without connecting the speaker, and it will burn out at no load.

2. The input voltage to the terminal should be connected strictly according to the instructions, and it cannot be connected incorrectly.

3. Do not be scalded on the hot topic of the tube. Install the tube after normal power-on and no abnormality

The latest version has been launched, which has increased the pre-stage gain and better sound field positioning

The resistance and capacitance values of the PCB parameters and the schematic diagram are slightly different, and the parameters marked on the PCB shall prevail

Optional tubes available

PSVANE Noble Voice Hi-Fi Edition 300B Tube +5Z4PRectifier tube + 6SN7 tube

https://item.taobao.com/item.htm?spm=a1z10.5-c.w4002-1582420965.36.FeRcIh&id=37846736175

https://item.taobao.com/item.htm?spm=686.1000925.0.0.gdFHQC&id=524244851334

 https://item.taobao.com/item.htm?spm=686.1000925.0.0.gdFHQC&id=524272330088

Provide optional power transformer address: http://item.taobao.com/item.htm?spm=a1z10.3.w4002-1582430503.21.Nt8J7V& id = 38261870346

Choke purchase address http://item.taobao.com/item.htm?id=38262054156

Japan Z11 chip output transformer
http://item.taobao.com/item.htm?spm=a1z10.5.w4002-1582420965.39.3bzr2h&id=37513251244