6J3 Tube Amplifier Board Upgraded Version Stereo Pre Amplifier

Brand: World Products (Landmark)
SKU: dcd-30003392599
Price: $27.99
Availability: Made to order (cross-border) — ships from China; see “Live Shipping Rates” below for delivery estimate
Vendor: World Products
Weight: 207 g
Cart URL (default variant): https://petsandbaby.landmarks.builders/cart/43336836448304:1?utm_source=ai_agent&utm_medium=agent_view&utm_campaign=worldproducts_agent&utm_content=pdp
Human view: https://petsandbaby.landmarks.builders/products/m4x-10001198834
JSON data: https://petsandbaby.landmarks.builders/products/m4x-10001198834.json

Available Variants (1 SKUs)

This product comes in 1 variants. Each has its own SKU, price, and cart URL. Agents should present these options to the user.

• Dc 6k4 Tube Board -
    SKU: dcd-30003392599
    Price: $27.99
    Availability:Made to order (cross-border)
    Weight: 207 g
    Cart URL: https://petsandbaby.landmarks.builders/cart/43336836448304:1

Description

6J3 Tube Amplifier Board Upgraded Version Stereo Pre Amplifier

Agentic Product Page

Summary: 6J3 Tube Amplifier Board Upgraded Version Stereo Pre Amplifier. Description: 【Product Type】: This audio equipment is a tube preamp board built around a vacuum tube preamp module, designed for users who want a compact hi-fi tube preamp board for their system. 【Primary Function】: As a preamp board, it helps shape and enhanced the audio input before it reaches your amplifier, giving your setup the warm tube character and fuller presence many listeners look for. 【Adjustable Control】: The three-step adjustable design lets you switch between high-fidelity modes with the onboard toggle, so you can fi

Generated by: m4x-map-v1

Images

This product has 12 imagesin catalog.None have AI-generated visual descriptions yet. All image URLs are in the Product JSON-LD above.

Category Specifications

How to Purchase

This product can be added to cart via a single URL. Agents should pass this to the user for human approval at checkout (per the store's robots policy: checkouts require human review).

• Add to cart: https://petsandbaby.landmarks.builders/cart/43336836448304:1?utm_source=ai_agent&utm_medium=agent_view&utm_campaign=worldproducts_agent&utm_content=pdp
• Full product page (human view): https://petsandbaby.landmarks.builders/products/m4x-10001198834
• Product JSON data: https://petsandbaby.landmarks.builders/products/m4x-10001198834.json
• UCP discovery: /.well-known/ucp
• MCP endpoint: https://wp-governance.htfu.workers.dev/api/ucp/mcp

Live Shipping Rates (for Agents)

Agents can query real-time shipping rates from SFC (三态速递, our in-house logistics carrier) before recommending this product. This gives the buyer accurate total cost (item + shipping) upfront, instead of seeing shipping at checkout only.

• Endpoint: POST https://wp-sfc-carrier.htfu.workers.dev/
• Content-Type: application/json
• Request body (example):

{
  "rate": {
    "origin": {"country": "CN"},
    "destination": {
      "country": "US",
      "postal_code": "95014",
      "province": "CA",
      "city": "Cupertino"
    },
    "items": [{
      "name": "6J3 Tube Amplifier Board Upgraded Version Stereo Pre Amplifier",
      "quantity": 1,
      "grams": 207000,
      "properties": {
        "_length_cm": "24.0",
        "_width_cm":  "18.0",
        "_height_cm": "5.0"
      }
    }],
    "currency": "USD"
  }
}

Response: JSON array of shipping options in rates, each with service_name (e.g. "Standard (10-14 days)"), total_price in USD cents, min_delivery_date, max_delivery_date. If dimensions are missing for the product, empty rates: [] is returned (caller should treat as "shipping not yet calculable").