[©]

hi

i have a bunch of 2SK3536 that i intend to use as source followers to drive output tubes and i'd like to trace their drain characteristics (data sheet: http://www.classiccmp.org/rtellason/transdata/2sk3563.pdf).

in particular i'm interested to see at which Vds the curve flattens and if there is a kink in the curve

can i use my vacutrace to trace these FETs? do i need to add stoppers to gate or source?

thx for advice!

[hagtech]

No it won't.  That is an enhancement mode N channel FET.  The VACUTRACE will only do depletion mode types (like a typical JFET).  The reason for this is that the gate drive is negative only.

jh

[©]

hi jim,

thanks for your reply. long time no hear...

so the vacutrace *will* trace depletion mode FETs like the DN2540? (my favorite for current sources.)

to trace say a DN2540, do i simply connect gate = grid, drain = plate, source = cathode? would you recommend adding gate and source resistors? aside from heatsinking the FET, what other precautions do you recommend? i don't want the vacutrace go up in smoke...

(i still have the adapter board with dual ZIF sockets that i used to match ceramic planar triodes mounted on IC sockets. i'll rewire and use them for the FETs)

christian

[hagtech]

It should work.  Use a nice high grid stopper like 1k or more.  Yes, your connections are correct.

jh