Bundle options
Bundle 1, DIY KITS, not include main capacitors and heat sinks
Bundle 2, finished board, not include main capacitors and heat sinks
Bundle 3, finished board, include main capacitors and heat sinks
Product Highlights:
1. The fully symmetrical dual differential input structure is used. The input tube adopts Gawain&x27;s dedicated A42, A92 pair of tubes, and uses a constant current source to maintain a constant working point. The sound quality is very delicate, the sound field is very good, and the atmosphere is balanced.
2 Use PASS machine dedicated high-power field effect tube IRFP240 IRFP9240 output, the tone is closer to the tube, the low frequency is full of vocals and moisturizing
3 Under the voltage of AC35X2, the maximum output is 100W 8 ohms. Compared with LM3886&x27;s 68W-4 ohms and 40W-8 ohms, the driving force is not on the same level. Note that the 100W of TDA7293 is tested under 4 ohms. 8 ohms does not exceed 60W, even under AC26, the output can reach 80W 8 ohms.
4 In terms of price, it is even more attractive than LM3886 and TDA7293, and the price/performance ratio is very high.
Note: The quiescent current of the board is adjustable. You can adjust the quiescent current according to your own heat dissipation. Some customers say that it generates heat, but it is static and not adjusted correctly. The heat dissipation can be adjusted to Class A. It can also be adjusted to 10MA or so, so that the heat is lower than LM3886,
Indicators: Compared with the integrated circuit LM3886, it can provide nearly double the output power and larger drive current, lower output impedance, this is not only experienced in loud and low sounds, but can make the speaker&x27;s low frequency potential Deeper, retractable
Sense of hearing: Compared with the integrated circuit LM3886, the obvious sense of hearing is that the low frequency density is very good, unlike the integrated amplifier, although there are many low frequencies, but the scattered, the intermediate frequency is fuller, and the high frequency is not frizzy and very delicate. This is because the physique of the output tube is better than that of the integrated LM3886, and the circuit design has a low open loop gain, which is suitable for natural hearing.
Cost: There is not much error in the cost of the successful release of Heji, and it can be done at one time, avoiding additional costs caused by repeated upgrades in the future
The machine can also be adjusted to pure Class A. However, the heat dissipation will be much larger. The driving tube and bridge stack under Category A will be relatively hot. Normally, it is recommended that Category A and B are in the best state.
You can buy the PCB alone, and the PCB is a blue double-sided immersion gold board. 25 yuan 1 piece
Material introduction:
1 The resistors are all Beijing copper pin 718 resistors, and the green capacitor ERO has been fully upgraded with German elixir red WIMA. The sound is more delicate and there is no burr.
2 The output tube is a dedicated pair tube IRFP240 IRFP9240 for PASS. The input tube is ON A42,92. This tube has been used on the early Gaowen machine and the effect is very good. The driving tube is Toshiba C5171 A1930.
3 The protection circuit is Japan Omron relay plus UPC1237, and the rectifier bridge is Sanken 50A bridge
4 PCB is blue double-sided immersion gold board
parameter:
PCB size: 150X100MM
Power supply voltage: AC16X2 to AC35X2