MJL4281/MJL4302 or MJL21193/MJL21194

[Vintage Audio Projec]

So what is the preferred choice of the 2?

So far I think the MJL4281/MJL4302 have more linear gain and can have higher voltages.

On the other side the MJL21193/MJL21194 have higher SOA ratings. The temp derating is also lower.
They are slower also.

Looking at the data the MJL4281/MJL4302 looks more refined/faster/less distortion as apposed to the MJL21193/MJL21194 which are more robust.

So what are the experiences?

I've got this Amplifier PCB board based on the lme49810 quite cheap.
It uses 3 pairs of 2SC5200/2SA1943 but I don't know if these devices are legit.
So I was thinking of replacing them and could use something better as well.
These are 30Mhz devices so the MJL4281/MJL4302 are not that much faster. (35Mhz)
The gain will be better for the MJL4281/MJL4302 as fas as I can see. This is a good thing as the LME49810 has to deliver less current.
I was thinking for voltage rails of around 70v and driving 8 or 4 ohms


MJL21193/MJL21194 will give more SOA reserve but are slower.....and lower gain.

So would be nice to hear some experiences.

 

[gary s]

Have a look at the On Semi MJW1302AG / MJW3281AG devices. Readily available and are designed for audio power amp output stages. Not badly priced and available at both Mouser and Digikey.

 

[Vintage Audio Projec]

I have looked at those also,
But from the datasheets it looks like the MJL4281/MJL4302 are better in everything. (better SOA, Faster, More HFE)
I could be wrong ofcourse.

 

[gary s]

You are probably right in what you say, I don't see a need for a device rated at 350VDC and that rating reflects its price, more than double other similar devices, with lower VCE ratings.