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Product Description

LJM PREAMP P9 Transistor Amplifier Board Class A Audio Power AMP for DIY


- Three stage filtering
- The first stage,LM317T produces by MOTOROLA ONSEMI
- The second stage LC filter
- The third stage RC filter
- Main filter capacitor adopts ULTRA ESR Panasonic LOW black gold new original FC series capacitor.
- Voltage regulator tube using MOTOROLA (M), ONSEMI and other regulators new original ones
- All transistors are original ;copper pin s,BC547C, all the magnification is about 600.

PREAMP9 Parameters:   
- THD+N <0.05%
- SNR >100 DB
- Frequencyresponse: 20HZ -20KHZ -0.2DB
- Input voltage: AC20V to AC28V (also can use AC12-0-12)
- Input transformer power > 5VA
- Quiescent current: 25 MA
- Voltage magnification = GAIN 10 times
- No potentiometer

Package List:

1) We accept Alipay, West Union, TT. All major credit cards are accepted through secure payment processor ESCROW.
2) We will process most order in 48 hours after payment verification and offer tracking no with every Deal(aliexpress only can fill the tracking No after 24 hours).
3) Support WORLDWIDE SHIPPING. (Except some countries and APO/FPO).
4) DHL/Fedex Tracking No Maybe Change after the item arrive Hongkong(eg.we shipped the item on Friday and fill the tracking No,but the tracking No may be Change on Monday if the Parcel arrive Hongkong).
5) SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season.
6) If you have not received your shipment within reasonable days from payment, please contact us first(pls don\'t put negative feedback before contact us!). We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!

1) We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important ,We request that you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns.
2) It is impossible to address issues if we do not know about them!

1) For Russian buyer,pls offer full name as policy requires.
2) For Buyer from Russian Federation,Argentina,Ukraine,Item may ship via EMS if you choose DHL/Fedex as complex customs declaration process.
3) For Buyer From Brazil,pls offer Tax No is you want to ship via DHL/Fedex,or item will ship via EMS though you choose DHL.
Packaging Details
  • Unit Type: piece
  • Package Weight: 0.15kg (0.33lb.)
  • Package Size: 10cm x 11cm x 12cm (3.94in x 4.33in x 4.72in)
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Packaging Details
  • Unit Type: piece
  • Package Weight: 0.15kg (0.33lb.)
  • Package Size: 10cm x 11cm x 12cm (3.94in x 4.33in x 4.72in)
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