Ono MC source resistors

AuroraB · 5th February 2006, 02:18 PM

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...??

wuffwaff · 6th February 2006, 09:37 AM

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

gl · 6th February 2006, 04:42 PM

Hi William,

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

GL

wuffwaff · 6th February 2006, 05:02 PM

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.

5th February 2006, 02:18 PM	#1
AuroraB diyAudio Member Join Date: May 2001 Location: Norway, -north of the moral circle..	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...??

6th February 2006, 09:37 AM	#2
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	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 __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

6th February 2006, 05:02 PM	#4
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	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. __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

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6th February 2006, 04:42 PM	#3
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	Hi William, Could you explain 4mv per FET. Do you mean 4ma per Fet? GL

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