Can somebody tell me what these Vgs?

[mindwave_21]

Ok, so I pulled out the 8 "matched" transistors on the Jet Phaser in the LFO circuit, and I was expecting at least a few of them to be in a 3V sweep range (I don't know why I was expecting 3V except RG told me so  :wink: ).  Instead, I got this weth RG's JFET matching circuit...
-0.791
-0.943
-0.818
-0.826
-0.879
-0.827
-0.807
-0.786

So what happened?  At first I thought it was a mistake in the circuit I made, but I tested 1 of my 50 2N5485 FETs and got -1.606, which is within the given range of the transistor's charactieristic Vgs.  
Is the sweep range range on my jet phaser really less than 1V?  That's way different from the 3V sweep I was expecting.  I don't believe all these FETs could be duds (it IS possible, though...), so if I replace these 8 matched with 8 2N5485 FETs, am I leaning towards this under 1V, or should I try to find a higher range (1.2-2.5 volt swing)?

Any and all help appreciated.

[R.G.]

What that's telling you is that for the JFET matcher conditions (which may or may not be what they used) the Vgs is about 0.8-0.9V.

That's not the Vgs off. Vgs off has to be less than 3V, because that's about where the source bias is (usually) in JFET phasers.

I would whip in a set of 1.6 volt matched ones with no hesitation.

[mindwave_21]

Thanks again RG!

[R.G.]

My pleasure