1pair E505 Gold Sealed Tube Pure Power Amplifier Board, Adjustable Class A High Power HIFI Fever

E505 sound characteristics: natural and slender, wide sound, very large dynamic effects, characterized by extremely deep bass diving.

Feature:

1. Use original Anson MJ15024G/MJ15025G and Toshiba 2SA1930/2SC5171.

2. The interstage coupling capacitor uses WIMA top capacitor 1UF, the sound is natural, and the sound field is wide.

3. The n-resistance uses a five-ring metal resistor. The main circuit uses a five-ring metal film resistor with an accuracy of ±1% to ensure a good signal-to-noise ratio.

4. PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thickness, spray tin full process to ensure good passing performance of large and small current

5. The biggest feature of this board is the use of the current advanced C1237 BTL speaker protection circuit, which effectively eliminates the impact sound and DC output protection function of the open and shutdown, making your speaker safer.

6. The layout of the entire circuit board is quite rigorous and reasonable. The overall PCB trace is grounded at one point. The power amplifier board works stably and reliably, and the output power is large; the sound is beautiful and round, and the sound field is wide. The three-dimensional sense is strong, the low frequency is solid and solid, the signal-to-noise ratio is quite excellent, the dynamic range is wide, the details are clear, the transient response is excellent, and all kinds of music are played comfortably. It has a very good performance in the family's playback environment.

Basic parameters:

1. Power supply parameters: one set: DC+-(35V-55V) recommended +-45V (AC: transformer 300W double 32V, need to add rectifier board)

The other group: single AC12V (note: each board is powered by a single AC12V power supply, that is, one board is powered by a single AC12V power supply)

2. Power: 300 watts (total harmonic distortion THD+N<0.1%), DC+-45V, 3 ohms

3. Class A 80W, measured under 3 ohm load

4. Speaker impedance: 4-8 ohms.

5. PCB size: 87*334MM.

Plate: 110 wide (including aluminum) *334MM

6. First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistor so that the voltage at the two points C and D is 1.5-2V (that is, the voltage across the R9 (1K) resistor); at this time, the input differential current is 1.5- 2MA, this value is of sound quality

7. The quiescent current of the large tube is 100MA: adjust the adjustable resistor VR2 (1K) so that the voltage at the two points A and B is 22MV, and the quiescent current I=22MV/0.22R resistance is 100MA; if the customer’s heat sink is large enough, it can make Increase the quiescent current, generally 100MA-300MA sound effect.

8. Weight: 0.6KG+0.6KG

Package:

1 pair E505 Golden Seal 5 Pairs of Tube Pure Power Amplifier Board Adjustable Class A High Power HIFI Fever