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Old 5th February 2006, 02:18 PM   #1
AuroraB is offline AuroraB  Norway
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Default Ono MC source resistors

I am currently working on two Ono's, - one for myself and one for my brother.......
Looking through my supply boxes, I noticed that I have only BL versions of the 2SK170, and I remember there was some fuzz about raising the source resistors in order to decrease the current when using BLs...doing a search didn't really make me any wiser....

Is there any conclusion to this matter, from those of you who have finished the Onos...??
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Old 6th February 2006, 09:37 AM   #2
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Hi,

I raised the source resistors and disabled the high gain stage (76dB)
You can set the source resistors for 4mV / fet.

Works fine

william
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Old 6th February 2006, 04:42 PM   #3
gl is offline gl  United States
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Hi William,

Could you explain 4mv per FET. Do you mean 4ma per Fet?

GL
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Old 6th February 2006, 05:02 PM   #4
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ooops,

yes 4mA, sorry.

william

P.S. I used 22R source resistors and have between 4,56 and 4,68mA bias per fet. It gets a bit higher after warmup.
I used fets with Idss between 6,36 and 6,40mA and 6,51-6,70 mA. Had 25 to match measuring Idss and Vp so I could draw the Vgs-Id diagram and choose a source resistor.
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