Attributes

Brand	-
Category	Electronic Components / Maker DIY / DIY Kits & Electronic Building Blocks
Origin	-
Model Number	Zhongxia S66E
Circuit Type	Six-Tube Superheterodyne
Power Supply	3V DC (2x AA Batteries)
Frequency Range	525 kHz - 1605 kHz (AM Band)
Speaker Impedance	8 Ohms
PCB Material	FR-4 Fiberglass
Assembly Status	Fully Assembled and Tested
Enclosure Material	High-Impact ABS Plastic
Primary Use Case	Electronics Education and Hobbyist Learning
Package Contents	Radio Unit, User Manual, Warranty Card

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Great classroom demonstration tool

As an electronics instructor, having a few of these pre-assembled units is invaluable. When students get stuck debugging their own kits, they can compare voltages and waveforms against this working S66E model. The build quality is consistent across the five units I ordered.

Anonymous

Mar 24, 2026

Rating: 4/5

Good educational value

The layout of the PCB is very clear, making it easy to trace the signal path from the antenna to the speaker. It's a classic six-tube design that really helps visualize how superheterodyne receivers work. Only wish it came with a schematic printed on the box.

Anonymous

Mar 20, 2026

Rating: 5/5

Saved me hours of troubleshooting

I struggled with my own kit assembly and couldn't get the oscillator to start. Buying this finished S66E helped me realize I had a faulty transistor in my own build. The comparison made fixing my project easy. Great value for the price.

Anonymous

Mar 11, 2026

Rating: 5/5

Works right out of the box

Inserted two AA batteries and immediately heard a clear broadcast. No complex setup required. It's encouraging to see a working electronic device that you can actually understand by reading the manual. Perfect starter piece for any electronics bench.

Anonymous

Mar 08, 2026

Rating: 4/5

Solid reception, simple design

The superheterodyne circuit works exactly as expected. Sound quality is decent for a small 8-ohm speaker. The casing feels a bit lightweight, but for a teaching tool, it's perfectly adequate. Tuning is smooth and the dial markings are legible.

Anonymous

Mar 05, 2026

Rating: 5/5

Perfect for learning radio theory

I bought this finished unit to compare against the kit version I built last month. The soldering on this OEM product is flawless, and the alignment is spot on. It picks up local AM stations clearly without much static. Highly recommended for students who want a reference model.

5 FAQ

Q: Can I modify the circuit to receive FM signals?

A: This unit is specifically designed and aligned for the AM broadcast band (525-1605 kHz). Modifying it for FM would require significant component changes and redesigning the RF front end, which is beyond standard modifications.

Q: What should I do if there is no sound when I turn it on?

A: First, check that the batteries are inserted with the correct polarity and have sufficient charge. Next, ensure the volume potentiometer is turned up. If issues persist, check the speaker connection wires inside the case.

Q: Is a schematic diagram available for this finished product?

A: Yes, the user manual included in the package contains the full schematic diagram for the S66E six-tube superheterodyne circuit, along with voltage test points for educational purposes.

Q: Is the enclosure durable enough for daily student use?

A: The ABS plastic enclosure is designed to withstand normal handling in a classroom or home workshop environment. However, it is not impact-proof, so we recommend treating it with care to avoid cracking the case.

Q: Does this come with batteries included?

A: No, the Zhongxia S66E does not include batteries. You will need to provide two standard AA batteries to operate the radio.

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