"K118" Semiconductor - HELP? - diyAudio
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Old 23rd June 2008, 06:34 PM   #1
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Default "K118" Semiconductor - HELP?

Hi there

I need some info on a semi-conductor simply marked as "K118" in a tube pre-amplifier (feeding one half of a 12AX7 tube - two units for the single tube).

Is this some kind of regulator? or what?

I have searched and Googled but couldnt find any concrete info.

D
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Old 23rd June 2008, 06:39 PM   #2
AndrewT is offline AndrewT  Scotland
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could it be a 2sk118?
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Old 23rd June 2008, 06:45 PM   #3
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Quote:
Originally posted by AndrewT
could it be a 2sk118?
Could be - I am not sure. It is a tiny unit with three pins like a TO-92 package but squared off at the top.

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Old 23rd June 2008, 06:58 PM   #4
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That's the standard marking for the 2SK118 look on top for the "color" grade, it will be a single letter.
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Old 23rd June 2008, 07:07 PM   #5
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Under the simple "K118" there is also printed in very small font "0 46"

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Old 23rd June 2008, 07:23 PM   #6
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For us that might mean year 2000 week 46 date code. Pretty easy to test non-destuctively with a voltmeter.
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Old 23rd June 2008, 07:36 PM   #7
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I did download the 2SK118 data sheet and it seems like it. Certainly looks the same.

Now what do you think it would function as? Buffer amplifier or voltage regulator?

D
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Old 23rd June 2008, 08:06 PM   #8
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Quote:
Originally posted by GlidingDutchman
Buffer amplifier or voltage regulator?


Most probably neither. CCS.
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Old 23rd June 2008, 08:18 PM   #9
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Quote:
Originally posted by analog_sa

Most probably neither. CCS.
Okay... whatta CCS? Engris pleas...

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Old 23rd June 2008, 09:08 PM   #10
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Constant current source. Active load for the the 12AX7. IDSS @5.6mA matches quite nicely the expected plate current of 1-2mA.

You can verify this from your boards - there should be a resistor between gate and source and the fet should be the plate load of the tube. Well, just a guess.
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