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Interest for genuine Semisouth SJEP120R100 curve tracer matched pairs & quads

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EUVL

EUVL

Member
Joined 2003
xen-audio.com
#1
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We purchased a sizeable stock quite a few years back, and are finally planning to get them matched in 2019 using our own curve tracer.
Matching conditions will be 24V, 0~2A continuous mode on 60°C (+/-1°C) heater block.
https://www.diyaudio.com/forums/pass-labs/121228-f5-power-amplifier-1520.html#post4795279

We want to know how much interest there still is before deciding how many to match in the first round.
And whether pairs or quads are desired.
Would be great if you could help us get a feel.

Will take a while to match them all.
The heater block alone takes 3 hours to reach steady state temperature.


Thanks in advance,
Patrick
 
#2
Curve Traces of 10 Random Samples

The curve traces of 10 random samples taken in 2013 as incoming check.


Patrick
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Attachments

  • SJEP120R100 Random Sample.png
    SJEP120R100 Random Sample.png
    64.5 KB · Views: 2,266
#9
> how much for a Quad ?

Depends on how much matching rejects we have.
If we just measure single point Vgs, we probably and line them in descending order, we shall have little or no rehject.
But if we match by curve traccer, we probably have 25% reject or more.


Patrick
 
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