Piece of cake. VSSA class A/B in the bass TSSA 1.6 class A in the mids & highs. Both diminutive and SMD, both same power-same tone, you set their gain the same and you go biamp to push the 12 inchers better.
Ha, ha. That's quite a heroic piece a' cake to me. And after its finished, I would need some Salas DCB2 pre! While staying in a dreamworld, I thought, I could build on of them and if it turns out a bad marriage with S100, I would ditch them for some potent DIY ones.
SMD keeps me at bay,
but as LC says, there has to be a first time someday. 
SMD keeps me at bay,
but as LC says, there has to be a first time someday. 
Here is my stash of 60- 2SK369-BL measured at 9V for 20 seconds each.
These were purchased at AMPSLAB. The deviation seems similar to 2SK170BLs.
9
9.3
9.5
9.5
9.7
9.7
9.7
9.8
10
10.3
10.5
10.5
10.5
10.5
10.6
10.7
10.7
10.7
10.8
11.1
11.4
11.4
11.4
11.5
11.5
11.5
11.8
11.8
12.1
12.2
12.2
12.2
12.4
12.4
12.5
12.5
12.6
12.8
12.8
12.8
12.9
12.9
12.9
13.1
13.1
13.1
13.3
13.3
13.9
14
14
14
14.4
14.4
14.5
14.7
14.7
14.9
15.1
These were purchased at AMPSLAB. The deviation seems similar to 2SK170BLs.
9
9.3
9.5
9.5
9.7
9.7
9.7
9.8
10
10.3
10.5
10.5
10.5
10.5
10.6
10.7
10.7
10.7
10.8
11.1
11.4
11.4
11.4
11.5
11.5
11.5
11.8
11.8
12.1
12.2
12.2
12.2
12.4
12.4
12.5
12.5
12.6
12.8
12.8
12.8
12.9
12.9
12.9
13.1
13.1
13.1
13.3
13.3
13.9
14
14
14
14.4
14.4
14.5
14.7
14.7
14.9
15.1
And the rest is not suitable for our purposes correct? or can the source resistor be raised to use higher IDSS pairs?
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It can. But the smaller it stays the less it adds its own small noise. There is some good bunch around 12.5mA +/-1 also in yours. If others will report some stashes too we will have some statistic so to fix the IDSS spec to what will be expected as easier to chance on.
Another thought Salas is my measurement time. These are slightly higher numbers, because the higher the IDSS, the more they tended to drift up in IDSS. 20 seconds seemed to be the time where it settled, or just rose much more slowly.
Should we be measuring the first number we see, or standardize on a timeframe? I can remeasure if we all agree on a certain standard.
It looks like a 25 percent yield on a stash, so expect to order possibly 4x what you need. Of course based on my current results.
Should we be measuring the first number we see, or standardize on a timeframe? I can remeasure if we all agree on a certain standard.
It looks like a 25 percent yield on a stash, so expect to order possibly 4x what you need. Of course based on my current results.
High transcondutance Fets tend to drift up noticeably because the warmer they get the easier it is to gain enough more current. We will say 20 secs time for all.
P.S. Another way is to measure their resistance from drain to source. If you will do a check you will notice that same IDSS pairs show the same RDS. The higher the IDSS the lower the RDS also.
I bought a DCA Atlas Pro too. Just not in my hands yet. Has it been repeatable for Vgs(off)?
