E4 FET headphone Class A Amplifier kit UPC1237 Protection DIY


Price: $36.80

  • Shipping Weight: 210g

Add to Cart:

    (DIY kit onlyyou need to solder the components and board by yourself.

    All components and PCB are included.)


    Preamp input circuit uses a similar JC2 dual differential FET input frame ,

    Output current up to 5A with Toshiba MOS power transistor,

    power is not a three-terminal regulator,

    single-tube in series with the most simple way to make sound more natural.

    This board also with Perfect headphones protection circuit.

    Power supply:Dual AC(12-15V)

    PCB Size:126MM X 98MM

    (The potentiometer can install the RK27 or RK16,The price include the potentiometer of RK16,  If you need the ALPS RK27 pot,please contact me.)

    (Ship via registered airmail, tracking number will be provided, safer than un-registered one.)


    • This item is in stock.
    • Fast shipping within 24 hours (excluding weekend)
    • Tracking number will be provided
    • Safe packing in ESD bags and strong cartons
    • High quality products
    • Freight by weight

    Thanks for visting my store!

Welcome to diyhifishop webstore.

About Shipping:
1.Free shipping to worldwide with tracking No.
2.Handing time: Your items will be shipped within 2-4 business days after payment received (excluding delivery time).
3.Delivery time:
Ship via regular international airmail from China

Normally takes 12-25 business days to arrive in US

Normally takes 15-35 business days to most other countries

4. You also can add more money to choose EMS or DHL express for a faster delivery time, which normally takes 3-8 business days only.(Please contact us)
PLS Note :

1.More than 2KG parcel. we will send express delivery, such as DHL EMS FEDEX OR other express. when your order, please leave your phone number, so we can faster delivery.Thanks.
2.We will not responsible any Customs fee or duty.

About Return:
1. If you receive a wrong or defective item please email us within 15 days from the date you receive the product. Later than 15 days the item cannot be accepted for return.

2. If the order is defective we will send replacement to you and no additional charge. If the order is not found to be defective we will refund the product cost to you only. Shipping and handling are not refundable.

3. All returns must include all original items undamaged, in re-saleable condition, all original packaging including manuals, warranty forms, etc. Software sales are not refundable.

If it is man-made damage, or improper use, this situation will not get a refund, please before you return to determine whether it is their own errors, otherwise it will not be processed.

Happy shopping.Thank you very much!



Choose a ranking for this item. 1 star is the worst and 5 stars is the best.