Features 1、The whole machine contains 7 triodes, so it is called 7‑tube radio. 2、Triode V1 is the frequency conversion tube, V2 and V3 are the medium amplifying tube, V4 is the detection tube, V5 is the low frequency pre‑amplification tube, and V6 and V7 are the low frequency power amplifier tubes. 3、The secondary medium amplifying tube is standard circuit, and the intermediate frequency has been adjusted to 465KHz. 4、The outer casing plastic is new material, long lasting. 5、All levels of circuits have Ic test ports. 6、The circuit diagram, assembly drawing, parts list and process documentation are complete. Specification Condition: 100% Brand New Item Type: Radio Electronic DIY Kit Frequency range: 525~1605KHZ Output power: 100mW (upper limit) Speaker: φ57mm, 8Ω 0.25W Power: 3V (2 x AA batteries) (battery not included) Volume: Approx. 122 × 66 × 26mm / 4.8 x 2.6 x 1in Package List 1 x Front Shell 1 x Back Shell 1 x Speaker 1 x Circuit Board 1 x HX108-2 Board 1 x Large Disc 1 x Small Disc 1 x Paper Disc 1 x Positive Plate 1 x Negative Spring 4 x 2P Capacitor 7 x 3P Components 4 x Tuning Plate Screw 10 x 2P Ceramic Resistor 13 x Resistor 3 x Diode 1 x Magnetic Bar 5 x Screw 1 x Tuning Board 2 x Transformer 1 x Magnetic Rod Bracket 2 x Positive and Negative Wires 2 x Speaker Cable 1 x Potential Plate 1 x Coil 1 x Long Rod Spring 1 x Chinese Manual