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JFETs from Linear Systems
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Old 8th November 2013, 05:32 PM   #21
EDDELARUE is offline EDDELARUE  Brazil
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11.60 32.7
11.60 32.8
11.60 32.9
................
// 11.62 33.0 //
................
11.64 32.9
11.68 32.7
11.68 33.0
11.70 32.9

For highlighted above we figuring out VP= - 0.7v. So, we have the equation of jfet and two points of the graph.
My doubt : the others points of "your jfet" : Is the same with graph?!
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Old 23rd November 2013, 02:03 PM   #22
craigtone is offline craigtone  United States
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Quote:
Originally Posted by krath View Post
Can someone explain which device grade A,B etc is best for Aleph J power amplifier.
Did anyone ever answer this?
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Old 23rd November 2013, 02:37 PM   #23
Zen Mod is offline Zen Mod  Serbia
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yes
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Old 23rd November 2013, 02:56 PM   #24
craigtone is offline craigtone  United States
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yes
and?
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Old 4th December 2013, 06:05 AM   #25
auxie22 is offline auxie22  Australia
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Default what grade JFET to use in the Aleph J

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Originally Posted by craigtone View Post
and?
Probably best to use the BL's as most people who have made the Aleph J and F5 for that matter use them. The higher Idss will theoretically give you higher transconductance therefore higher gain. how true this is in reality all depends on what you use for your constant current source and your biasing resistors amongst other variables.

I would say people have done tests on both the GR and BL grades and it seems the BL has come out on top as that is what's preferred on the BOM. In any case stick to the BOM it is generally a tried and true method.
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Old 6th February 2014, 02:22 AM   #26
Jason is offline Jason  Australia
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All grades now back in stock.
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Old 21st October 2014, 06:54 PM   #27
maartentje is online now maartentje  United States
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When are the lsk170 back in stock?
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Old 23rd October 2014, 10:22 AM   #28
Jason is offline Jason  Australia
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Hi! We currently have grade D in stock. Other grades will be replenished in a month or two.
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Old 13th November 2014, 03:02 PM   #29
dirkwright is offline dirkwright  United States
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Does anyone have spice models for the LSJ74 series? I have one for a SJ74, and it appears to be closest to the B version. I don't know if it's accurate to this new production series.
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Old 9th December 2014, 08:37 PM   #30
Holzarbeiter is offline Holzarbeiter  United States
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JFETs from Linear Systems
Jason,

Is Grade B still on schedule to arrive by the end of this month? Need to put in an order at the store for other bits at the same time...

Thanks


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Hi! We currently have grade D in stock. Other grades will be replenished in a month or two.
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