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Old 27th March 2013, 12:01 PM   #21
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Tony - new to this board and got the diy bug. I've repaired an old amp and now that has been successful would like to build an F5 - but can't seem to source the two components you list (I've got everything else), i.e. the 2SK170 2SJ74. so I'd be interested in buying some of these from you - could you pm me regarding cost, etc?
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Old 27th March 2013, 12:03 PM   #22
Salas is online now Salas  Greece
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Quote:
Originally Posted by tony399 View Post
Nice bit of kit but not cheap at 115!
It will pay you back since it will increase confidence of matching that you can demonstrate.
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Old 27th March 2013, 12:21 PM   #23
tony399 is offline tony399  United Kingdom
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It will pay you back since it will increase confidence of matching that you can demonstrate.
That's true, I can get plenty of matches so the extra cost (and extra time) could be passed on per device at less than 1 and I will have another toy to play with.
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Old 27th March 2013, 12:22 PM   #24
The Dastardly Dad of Three
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It does look like it does what it does very well, but.....
If you are investing that kind of dough it may be worthwhile looking for something that has utility beyond 20ma for when this particular effort is worn. I love my curve tracer from locky. It's kinda clunky but a spectacularly useful bit of kit I can tell you. There may well be other options out there but I don't know of any.
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Old 27th March 2013, 12:31 PM   #25
tony399 is offline tony399  United Kingdom
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Quote:
Originally Posted by AndyStarkey View Post
Tony - new to this board and got the diy bug. I've repaired an old amp and now that has been successful would like to build an F5 - but can't seem to source the two components you list (I've got everything else), i.e. the 2SK170 2SJ74. so I'd be interested in buying some of these from you - could you pm me regarding cost, etc?
FYI, from a reliable source;

"Actually F5's do not need much matching. 1 mA
tolerance is fine."

I will get back to people once they are verified as genuine and if they aren't then I will say so.
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Old 27th March 2013, 12:44 PM   #26
tony399 is offline tony399  United Kingdom
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ELV K100?

Last edited by tony399; 27th March 2013 at 12:56 PM.
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Old 27th March 2013, 01:53 PM   #27
tony399 is offline tony399  United Kingdom
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Just to bring everyone's attention to the extent of the problem;

Counterfeit Transistors

This doesn't directly refer to K170/J74 but these definitely are widely conterfeited as many who have been burnt will concur.
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Old 27th March 2013, 01:54 PM   #28
dodo is offline dodo  Poland
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you can messure the static parameters of the Jfet
Attached Images
File Type: jpg Jfet_N_messurements_schem.jpg (30.7 KB, 533 views)
File Type: jpg Jfet_N_Id(Vds)_Vgs_const.jpg (99.8 KB, 533 views)
File Type: jpg Jfet_N_Id_(Vgs)_Vds_const.jpg (81.3 KB, 525 views)
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Old 27th March 2013, 02:04 PM   #29
tony399 is offline tony399  United Kingdom
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you can messure the static parameters of the Jfet
If you give me some more info on actual resistor values I can easily set up this test circuit and do some measuring
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Old 27th March 2013, 02:09 PM   #30
dodo is offline dodo  Poland
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those resistor just have to reduce the current , so the power dispation would be within jfet limit
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