Rectifier board link:
https://de./item/1005003296610936.html?spm=5261.ProductManageOnline.0.0.18524edf5qOx2n
Upgraded ACA, adding the secondary filter formed by D1 and C5, the front and rear power supplies are isolated, and the background is darker than the original circuit. After the old PASS improved, R15 was added with a quiescent current of 1.5A. The boards of other stores do not have this part.
It is said that this line was drawn at random during the party. The parts are simple and the sound is good. It is very suitable for DIY hands-on practice, small environment listening, desktop system. After improving R15, it can output an amazing 11 watts. The price of a few thousand 300B is only 8 watts. The shortcomings are high fever, single-ended Class A, good sound, fever problem can hardly trouble fans.
PCB size: 88*58
DC power supply: up to 30V
Power supply: minimum 100 watts, recommended above 150, transformer output 18-22V, switching power supply 19-24V.
Output power: 11.25 watts at 30V, single-ended Class A output power calculation method is voltage * current divided by 4.
Radiator: external heat dissipation chassis with a weight of 0.8 kg or more or more than 3.6 kg on each side.
The price of a single board, two per pair,
A board that has been welded and tested, take 2 in a pair
The maximum diameter of the output capacitor can be 22mm, which is convenient for players to replace and upgrade. Generally, the diameter of the board capacitor is fixed, and no upgrade space is reserved. All wiring is directly welded to the board to minimize the loss, and the sound is very positive. The board with the terminal twisted line has a significantly worse sense of hearing. The on-board LED indication is more intuitive than the black board.
Except for the disassembly of the power tube, it is brand new. Choose 90% of the new soft copper foot IRF240, 100% imported. A few yuan a fake imported brand new tube abounds, the sound is wrong, the imported disassembly machine is the guarantee of quality and sound quality.
The selected current is above 20MA and 2 thinking 70, the sound is transparent, the low frequency is powerful, the high frequency is elegant, the overtone is enough, and it is better than using K246 and other small current tubes.
Panasonic 1 watt advanced printing resistor, low stability and stability. It still works stably at high temperature, and the cost is of course not cheap. The effect is also significantly better than the 0.25 watt iron foot 5-ring resistor.
VISHAY input bile capacitor, the super lossless capacitor used only when the machine is very advanced, the performance of each frequency band is perfect, the sound is moist, non-red Weimar and green ERO are comparable.
The rest of the accessories have been carefully matched, such as Gympie Nikon and Black Gold Panasonic. In short, which match is good and which cost is high. In particular, the Nikon FW capacitor sounds noble but stable, and the clean sound has a hint of sweetness. The forum has long been concluded.
The secret of the good sound is the cross-flow control tube, the genuine Toshiba white BC547C, the magnification is 600 times, the sound field details are at a glance, much better than the ZTX tube with a magnification of 200 or so. The genuine product has been copied for a few yuan each, and a few mao is not true.
The welded board is as follows:
The dimensions are as follows:
Radiator perforated copper pillar: (this baby does not include a radiator)