300B Tube Amplifier Kits Stereo Power Stage 6SN7 Preamp 5U4G Rectifier HIFI Audio DIY
Model No: WHFT-A300B(NS)
A lot of HIFI audiophiles like to do DIY 300B tube amplifier with scaffold-soldering way previously, but that is a great engineering and too much wiring, reliability and performance may be affected, also its appearance does not look good. Now, there are well-made PCBA instead of scaffolding soldering, the problems above will be completely resolved, and it is not difficulties since then. Because the PCBA board is free testing, and its manufacturing difficulties is equal to assemble a LM1875 amplifier
Framework of 300B tube amplifier kit adopts 6SN7 plus 300 B single-ended outputs. And this 300B PCB material is 2.0 thick double copper immersions gold. Output transformers are made of high-grade silicon steel plate Z11, and used imported electronic vacuum tubes.
The kits need be soldered and tested by buyer self, no including any tubes and Transformer.
1.This version is the latest version (version 1.1) that increases the gain of the preamplifier stage and the sound field positioning is even better.
2.The resistance and capacitance of PCB parameters and schematics are slightly different.The standard parameters of PCB shall prevail.
Photo after fixed tubes (The last version below for you information only)
(This 300B tube kits doesn’t contain the required five vacuum tubes, only PCBA as above photo shown)
1. Designed with tube 6SN7 + 300B single-ended output form, the most authentic classic 300B solution.
2. PCB with 2.0mm thick high-quality immersion gold.
3. High SNR, quiet background
4. Circuit is free debugging, making simple.
5. High quality component and parts are used, all are new parts. Coupling capacitor used the best human voice French SCR Suren one; tube bases of 300B are made of 95 ceramic base with special 24K gold-plate contacts, to ensure the PCBA achieving perfect performance, detailed see the BOM.
1. PCB size(L * W * T): 203mm * 107.2mm * 2mm
2. Components and parts included, refer to the BOM
3. Recommend specification of power transformer:
a) Output power: 250W
b) Input: 220V/50Hz
320V - 0 - 320
4. Recommend specification of power transformer:
a) Primary impedance (kilohms): 3.5K (200mA) or 2.5K, it is made of taps with linear
b) Secondary (Ohms): 0 - 4 - 8
c) Frequency: 20-30K Hz (-2dB)
5. Recommend specification of Choke Coil: 5-8H
6. Recommend vacuum tubes
a) PSVANE HIFI version 300B tube x 2
b) Russia EH 5U4G EH rectifier tube x 1
c) Russia EH 6SN7 EH tubes x 1
7. Connection diagram
8. Circuit diagram
Note: This 300B tube kits doesn’t contain the required five vacuum tubes and transformers (output transformers, power transformers) and chokes.
Photo for 300B Finished with Casing
Mating Components Slected
If you want to buy them, please click the links.
1. Vacuum tubes
4. Chokes coils
5. 300B tube amplifier casing. The holes of tubes fixed may be cut as PCB layout.
1. Output transformer must connect speaker cabinets; otherwise Output transformer will be burned if there is no load.
2. Input voltage to the terminal connected must be strictly follow the specification, it can not be wrong.
3. After testing for PCBA without vacuum tubes is ok and no abnormal, the tubes just can be fixed into the based.
4. Do not touch the tubes after the PCBA works, there is high hot.
1. We provide you some items and components for your DIY. If you have enough capablities for circuit-reading, electronical components knowledge, assembling, soldering and problem-solving, you can buy them to enjoy DIY. If not, please don\'t buy them. We don't provide any technical support.
2. If you buy the items, it means you accept the terms above.
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