> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Ultra LD Mk.3 135W Class AB Audio Amplifier Kit

**Type:** Product page · **SKU:** AK5154
**Page:** https://core-electronics.com.au/ultra-ld-mk-3-135w-class-ab-audio-amplifier-kit.html ([markdown](https://core-electronics.com.au/ultra-ld-mk-3-135w-class-ab-audio-amplifier-kit.html.md))

## Retired product

This product is retired and no longer available for purchase. Search the catalogue for an alternative.

## How to buy

- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

**(Silicon Chip Magazine July ’11)** An improved version of the K 5151 Mk. 2 edition. It features less than half as much distortion at frequencies of 2kHz or above. It also boasts much improved thermal stability & flatter frequency response. Produces incredibly low levels of distortion even at high power outputs. The class AB design runs much cooler than genuine class A amplifiers, yet performance has not been sacrificed. It produces 135W into 8Ω or 200W into 4Ω with distortion levels around 0.006%. Heatsink is not supplied, we suggest the H 0536 diecast heatsink for a professional finish when mounted in a case. 
 
 
 
**Important Note For Kit Buyers:**  
This product is supplied in component form and requires soldering, drilling, and assembly. We recommend users are familiar with at least basic electronic principles and have the ability to solder.

**Performance:**
SNR: 123dB (un-weighted) 
Power: 135W RMS into 8 Ω 
Distortion: < 0.004% from 20Hz to 20kHz. 0.0006% typical 
Frequency response: +0, -0.3 (8Ω), 10Hz - 20KHzal

**Why buy a Kit?**
These kits are premium do-it-yourself projects designed to be assembled with ease. However, basic electronics knowledge and soldering skills are essential to construct our kits. A difficulty rating is provided to help determine if your ability is sufficient to build the kit project. Please note, once assembly has been commenced we are unable to honor any warranty claims. Please see the full details here.

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/u/l/ultra_ld_mk.3_135w_class_ab_audio_amplifier_kit__k5154__00.jpg)