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300B Tube Amplifier Kits Steteo Power Stage 6SN7 Preamp 5U4G Rectifier No Including Tubes HIFI Audio DIY
Important: Import duties, taxes and other customs related charges all are not included into shipping cost . Buyers bear all responsibility for all extra charges incurred (if any).
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.
Note:
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)
Features
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.
Product Specifications
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
c) Output:
320V - 0 - 320
0-5V
0-5V
0-6.3V
0-6.3V
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
a) PSVANE HIFI version 300B tube
b) Russia EH 5U4G EH rectifier tube
4. Chokes coils
5. 300B tube amplifier casing. The holes of tubes fixed may be cut as PCB layout.
Common senses:
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.
Note:
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.
Shipping
1.Important: Import duties, taxes and other customs related charges all are not included into shipping cost . Buyers bear all responsibility for all extra charges incurred (if any).
2. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address. We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
3. When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
4.Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound. The shipping rate can be showed at the Checkout page. There are two options for shippig as below.
A. Standard Shipping(≤2KG): The Post Registered Air Mail, USPS/ePacket, PostNL, Singapore Post, or DHL Global Mail
B. Express Shipping: EMS, DHL, UPS , or Fedex, Special Route.,etc. For faster shipping and smooth transaction, we will change the shipping company among them
C. Economy Shipping: China Air Post Mail / Parcel, Hongkong Air Post Mail / Parcel, or shipment by sea etcReturns Policy
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Seller Guarantees
1. One year Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.
2. Defective items MUST BE reported and returned within the warranty period (with the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN EXPIRED WARRANTY. You agree to all of the above-listed policies upon ordering on our store.
