kx-Amplifier PCB's are back in stock at Jim's Audio here:-
Hifisonix kx Low Dist ,Wide BW 25 W Class A, 50W classAB CFA Amp PCB set stereo! | eBay
The new batch of boards are as before, but now include gold plating.
As always, any questions, let me know.
Any chance to make an option 2 kx boards + ripple eater PSU?
Hello thimios, You can use the original PSU, but you do need 4-5V more on each PSU rail to get the full benefit - the EF2 kx-Amp output stage drops more swing than the original sx-Amp.
but you do need 4-5V more on each PSU rail to get the full benefit
Are you speaking about full power or something else?
Full power. You lose about 2 volts on an sx-amp and another 4 to 5 on top of that for the kx at full power into 8 Ohms.
So sx - I recommended +-22~23 VDC
for kx I recommend 27~29
Naturally, you will need decent heatsinks for class A operation
Naturally, you will need decent heatsinks for class A operation
That's why i want to recycle my SX
Hi,
i was looking at this KX amplifier, very interesting...i'm not very experienced but i would like to gather some information...
first of all: many thanks to the designer for sharing all the details and instructions!!!
How about matching the transistors, do these need to be bought a lot and be matched?
As far as concerning for;
the output transistors NJW3281/NJW1302.
the driver transistors KSA1220A and KSC2690A
the TO-92's
or just buying the nessecary quantity and the right type?
thanks in advance and greetings!
i was looking at this KX amplifier, very interesting...i'm not very experienced but i would like to gather some information...
first of all: many thanks to the designer for sharing all the details and instructions!!!
How about matching the transistors, do these need to be bought a lot and be matched?
As far as concerning for;
the output transistors NJW3281/NJW1302.
the driver transistors KSA1220A and KSC2690A
the TO-92's
or just buying the nessecary quantity and the right type?
thanks in advance and greetings!
ripple on the main output rails of a few volts under load makes no difference if the amp's VAS stage is properly regulated.
The kx-Amp PSRR without the optional cap multiplier PSU is >70 dB at LF and better at HF - typical figure for a CFA. With the optional cap multiplier PSU, its about 30 dB better.
VFA PSRR is usually about 20 to 30 dB better than a CFA.
@Bonsai
https://hifisonix.com is down for sure, there is something wrong.
https://hifisonix.com is down for sure, there is something wrong.
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