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SOLD: XINDAK XA8800MN Monoblock Class A Power Amplifier Pair NSW


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Item Condition: Very Good
Shipping Options: Pickup available but audition is not available.
Suburb or Town: Ryde
State: NSW
Payment Method: Cash on pickup
Reason for selling: Downsizing

Further information:

I am the second owner. These were purchased from another SNA member about 6 years ago.  Recently serviced by Chris at Kimil Electronics to check all OK and the bias was reset. These are two heavy buggers to lug around but they sound sweet as. 

 

Very dynamic sounding with 200W power into 8 ohms, but Class A operating for finesse.  Ideal amp for many diamond or Beryllium tweeter speakers as well as ESLs and ribbon speakers. 

 

Can be shipped as are in the original double boxes, but prefer personal pickup

 

From the Xindak website

The circuit features of XA8800MNE

Designed as a separate mono-channel structure, XA8800MNE is a full symmetrical current negative feedback Class A amplifier. 

The input buffering amplifying stage adopts fast and wide-frequency amplifying circuit with cross coupling compensatory structure.

 

Darlington complex structure on the Voltage amplifying stage not only ensures enough voltage gain but also raises the input impedance to reach excellent match between the different stages. Besides, the adoption of Cascode circuit offers a good solution of the effect on the high frequency by the transistor junction capacitance. Thus the frequency width could be raised, the output characteristic curve of the bipolar transistor could be improved, the distortion of this stage could be reduced and high stabilization could be achieved.

On the current drive stage, it adopts high power FET to supply drive current for the end stage. The parallel output transistors on the end stage could reduce the output impedance, increase the output power, and improve the load capability with low resistor.

The static working current of 6 pairs high power transistors on the end stage as parallel output is about 300mA and each transistor works in the special linear area where current is higher. This could eliminate crossover distortion and switch distortion efficiently and reduce the output impedance. Equipped with impedance compensatory network including L、Rs、Rz and C on the output terminal, the load of this unit will be closer to pure resistor and difficult to cause self-excitation. Meanwhile, it could afford bigger damp to enhance the controlling ability of this unit to the loudspeaker.

In order to ensure the middle point voltage of this unit approximately to be zero, high quality operating amplifying components, high frequency non-inductance resistor, silver in glass capacitance and so on are put to good use to the loop current servo feedback circuit.

 

As for the power supply for the complete unit, each channel adopts 600W high quality annular transformer while the other parts adopts winding group on the power supply separately. Additionally the power supply for the power amplifying, voltage amplifying and protecting circuit are separated: the power supply for the power amplifying part is equipped with 50A bridge rectifier and 60,000MF filtering capacitance and supplies power directly after commutating and filtering; the power supply for the voltage amplifying adopts stable power supply with fast speed, low noisy, low impedance and strong ability to avoid the “ripple” to avoid the modulating disturbance caused by fluctuation of the power on the following stage and make the sound purer.

Additionally, this unit adds protection functions, including power-on delay concussion protection, zero point floating on the output terminal, over current and over voltage of the power transistor protection. In order to avoid the noisy when power-off, this circuit adds transient release circuit, power-on delay circuit and glittering indicating circuit for protection to make this unit more intellective.

Parameter Name Parameter Values
S/N Ratio ≥110dB
THD ≤0.025%
Input Impedance 47K ohms
Number of Channels 1
Output One Pair Gold Plated Binding Posts
Input Sensitivity 1.7V
Frequency Response 5Hz~150KHz (±0.5dB)
Input RCA*1, XLR*1
Rated Output Power 200W(8ohms),400W(4ohms)
Net Weight 24Kg
Dimensions (W*H*D) 305mm*202mm*427mm

Photos:

 

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Great amps.  Will drive just about anything. Lovely non fatiguing  sound. I used to have a pair. 
You won’t do better for the money. 
GLWTS. 

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5 hours ago, kefacurus said:

I have the preamp to match these if anyone is interested. It is a very solid unit with remote.

So do I but not really for sale and it’s extremely clear and detailed, well made.

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Hi Tom,

Good Nick. 

 

Box size is 55 x 45 x 38cm.  Deadweight is 25kg per box.  there are 2 boxes.

Have original double boxes for each monoblock.

Cheers

Russ

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7 hours ago, Headbanger said:

Hi Tom,

Good Nick. 

 

Box size is 55 x 45 x 38cm.  Deadweight is 25kg per box.  there are 2 boxes.

Have original double boxes for each monoblock.

Cheers

Russ

Thanks Russ, I'll grab them please mate. First time buying thru SNA so I'll message you again with my phone number and go from there if that's ok. Cheers 

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