Introduction:

This is a brand-new design layout, Purple gold plated PCB is adopted, Refer to the PASS A3 circuit, the sound style is sweet and honest, the music taste is very good, transparent, the low frequency elasticity is good, and the human voice is more poisonous than 1969! with large area copper traces on the top, bottom and bottom, and can push tin, which is very stable when large current passes.

IRFP250 FET output tube and differential tube IRF9610 is precisely matched to make the midpoint output voltage as low as 50mV. wiring and materials are very important, this is not only the reliable quality, but also the foundation of good sound!

The input signal supports XLR balanced input or RCA single-ended input. When using RCA single-ended input, XLR balanced input cannot be used. When using XLR balanced input, RCA single-ended input cannot be used. (NOTE: RCA and XLR inputs cannot be used at the same time).

Parameter:

● Input voltage: DC: +/-25V(Transformer power is not less than 300W/per channel)

● Output power: 30W /8ohm, 50W /4 ohm

● Channel:2 channel

● THD: 1KHz 1%, 0.003% /5W 8 ohm

● Input impedance: 18k ohm RCA, 10k ohm XLR

● Output noise: <300uV Unweighted 20--20kHz

● Dynamic range: 140dB

● Gain: 20dB

● Support signal input: RCA single-ended input or XLR balanced input

● PCB size: 248mm * 68mm

NOTE 1: PASS A3 is a pure Class A power amplifier, it is very hot, so the heat sink requirements are particularly high, please do not turn on the power without the heat sink installed, otherwise the FET tube will be burned immediately after the power is turned on. The weight of the heat sink is not less than 2.4KG per channel.

NOTE 2: We have DIY kit or Finished board (Optional)

◆ DIY kit ---- All parts need you to solder and test it.

◆ Finished board ---- All parts have been welded and tested OK.