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HiFi 12AX7 Vacuum Tube Preamp DIY KIT Stereo Home Desktop Audio Preamplifier

Item description

Notice:
 
1. This is DIY KIT version which needs you have some welding ability and electronic knowledge to solder, and finished version please click: Link
 
2. Not include power cord, please prepare it by yourself.
3. Due to the scarcity of electronic tubes and the instability of inventory, the actual shipment will be replaced with different types of electronic tubes according to the actual situation. All replacement components are of the same level, and there is no difference in function and effect. Please understand. If you mind, please do not buy.
4. This kit includes only a circuit diagram. It is not recommended for beginners, but for users with electronics experience who can read and understand schematics. If you have any questions, please feel free to contact us, we are glad to help you.     
Parameters:
  • AC power supply: 100V-240V
  • Audio Input: 4 groups * Stereo L/R RCA
  • Audio Output: RCA
  • Frequency Response: 10-26kHz (+/- 0.11dB), about 15 times voltage amplification
  • Total Harmonic Distortion: 0.078%
  • Signal to Noise Ratio: 99dB
  • Input impedance: 100k
  • Ouput impedance: 10k
  • Gain: about 11dB
  • Chassis Dimensions: 320mm*170mm*50mm/12.60*6.69*1.97in
  • Weight: 4KG/8.82lb
Features
  • Using Japanese original ALPS 16 Type 15mm 100k Duplex potentiometer, switch is produced by Taiwan-funded factory.
  • With 4 groups of RCA audio input, convenient to compare different audio source and no need to plug-in and out the cables repeatedly. Gold-plated terminals to guarantee lossless transmission.
  • Using 0.8mm stainless steel CNC punching chassis, its SNR up to99dB, the background is extremely clean without any noise.
  • Using WINA MKP10 0.1uf capacitors, 0.39u Swiss RIFA PHE 426 series, IT 2.2uf capacitors, etc.
  • Power transformer uses H360 0.5 piece 76 * 40 core, especially with double shielding layers GND，grounding line is yellow-green line outlet. A group of filament 3.15v * 2 for 3*12AX7 filament power supply, high-voltage 270V * 2 uses 6Z5P tube rectifier. Amplification circuit using scaffolding of welding.
Packing List
  • 1*Full set DIY KIT of tube preamp
  • Not include power cord.
Safe and secure payment by PayPal.
Please leave VALID TELEPHONE NUMBER which is necessary and very important.
 
Customs Clearance
We are NOT responsible for any customs duties fee.
We are NOT responsible for any import tax or customs delay.
 
Most item will be shipped within 2 working days. For package less than 2KG, we use Airmail (10-25 days to most countries) and for package over than 2KG we use Expedited Service such as DHL, UPS and FEDEX (5-8 days to most countries). 

Free Return Within 30 Days

We provide  return within 30 days for all items you bought on eBay, full refund and return shipping will be provided.

1-year warranty is provided for all items(Excluding: 1. Man-made damage or misuse. 2. Audio accessories and consumables such as vacuum tubes).

If you are satisfied with our products and service please leave a 5-star StarStarStarStarStar. Positive feedback rating Feedback is very important to us just like our lives, please DO contact us before you leave a neutral Neutral feedback rating or negative Negative feedback rating feedback, we will provide better solutions until you are satisfied.

 

 

 

Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including Douk Audio / Nobsound / Little Bear etc.
 
As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable.
 
We will spare no efforts to bring great products and service for customers and extremely to improve our customers’ listening experience.
Please don't hesitate to contact us if you have any questions or comments about our items. And our working time is from Monday to Friday between 9:00 am to 06:00 pm(Beijing Time), which means we can keep on-line at:
 
 Working time

Beijing(CN)Monday-Friday09:00 AM - 18:00 AM
New York(US)
Sunday to Thursday08:00 PM - 05:00 AM
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During holiday, please allow us to response you early next week. Please don't leave any negative / neutral feedback or make dispute/claim on our non-working time, thank you for your understanding and cooperation.
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