New Sugden IA4 Circuit 33W Pure Class A Single-ended Amplifier Board
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Specifications
- Brand Name
- SENGTERBELLE
- High-concerned chemical
- None
- Origin
- Mainland China
Product Description
Product Details:
Sugden's famous IA4 Class A circuit
Class A Single-ended OTL Power Amplifier Board with 33W Mono Channel
Supply Voltage: AC41v*1, Mono 200 W Reserve
Output power: 33 W
Static current: 800 mA-1000 mA, adjust potentiometer, make the voltage at both ends of resistance of 1 Euro/5 W reach 800 mV-1V, turn clockwise first, then turn back.
Size: 238*73mm
PCB 2mm thick, 70UM thick copper, high current forward and backward traveling, cross-section is 4 times the original plant
Hot soaking plate size: 250*71mm
All new components of finished sheet, alpha solder USA
ELNA FOR AUDIO 63v10000uF Electrolysis
The original factory adopted two new Sanken Guanwang and precise matching to C2922.
Recommended Protection Board: Specialized OTL Circuit
Package List:
1 × Sugden IA4 Circuit 33W Pure Amplifier Board (Not included Radiator )
Note：this is mono amplifier board ，if build stereo amp ，pls buy 2pcs ！
Pros & Cons
Pros
- Uses the legendary Sugden IA4 Class A circuit for high-quality, pure Class A sound reproduction
- Adjustable static current via a potentiometer for customized audio performance
- 33W mono channel output power with 200W reserve power for robust audio delivery
- No harmful high-concern chemicals included in the product
Cons
- Requires an external AC41v power supply, which is not included with the amplifier board
- Only available as a single mono channel board, so two boards are needed for full stereo audio setups
- No included mounting hardware or detailed DIY assembly instructions
- Ships from Mainland China, which may lead to longer delivery times for international buyers
Common Questions
What circuit and power output does this amplifier board have?
This amplifier board uses the Sugden IA4 famous Class A circuit, with a mono channel output power of 33W.
What are the key technical specifications of this amplifier board?
It requires a supply voltage of AC41v*1 (mono 200W reserve), with a static current of 800mA-1000mA adjustable via a potentiometer.
What audio setups is this amplifier board compatible with?
It is designed for single-ended OTL power amplifier projects, suitable for DIY audio enthusiasts building mono channel audio systems.
What is this amplifier board used for?
It is a replacement or build-your-own amplifier board for stereo or mono audio speakers, delivering pure Class A sound quality for home audio setups.
What shipping details apply to this product?
This item ships from Mainland China, per the listed origin details.
Product information last updated on November 18, 2025