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Old 17th May 2015, 03:25 PM   #171
be.audiophil is offline be.audiophil  Austria
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Dear All,

I recognized to have a stereo pcb for Xono and a pcb set for Draganīs UPS and those exotic trannies like 2SK389, 2SK170GR left in my cellar; those IRFD9110, IRF610, IRF9610 and SC1844 as well as SA991 and 2SK170BL should be in "stock" as well. Panasonic HS-TA, FC and FM are available in appropriate numbers too, so that I could start building a second Xono for me.

But Iīm a bit undecided about those coupling caps and the type of resitors I should go for.

Thus Iīm asking for your suggestions for the type of resitors I should go for?

The first Xono was build with nothing especially; resitors in the first build are quite normal 0,1% and 1% metall film types, caps from Panasonic.

What resitors do you suggest?

Shall I go for those non-magnetic Vishay Dale, PRP, Takman metal film or those exotic Shinkoh tantalums? Can anyone please describe what might change on the sound side when those resitors are used?

Additionaly Iīm asking about the combination for coupling caps for C10, C19, C37 on Draganīs pcbs. For those coupling caps I found hints and suggestions that 10uF Black Gate BG N would be best but are no longer in production and I didnīt find any sourcing option. Second options should be
  • 10 uF MKP (as supposedly used in Aleph Ono too)
  • a combination from 220 uF/25V electrolytic with a Panasonic 47nF MKP Bypass (as supposedly for C10 to be used in X-Ono too)
  • a combination of one 220 uF ELNA Simic II with a Panasonic 47nF MKP Bypass

Which of these options would you go for and what do you expect sound-wise from this options?

Many thanks in advance
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Old 14th May 2018, 04:42 AM   #172
kamis is offline kamis  Serbia
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What is the ONO/XOno ''natural'' ММ input circuit capacitance without 100pf capacitor?
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Old 15th May 2018, 05:56 AM   #173
kamis is offline kamis  Serbia
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To repeat my very logical question:What is the total input capacitance on Pass Ono/XOno moving magnet input ? It is well known fact that J-Fets have some parasitic capacitance.
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Old 15th May 2018, 06:20 AM   #174
Zen Mod is offline Zen Mod  Serbia
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Aleph Ono/ Xono
considering that input JFets are cascoded , you can practically exclude Miller (effect on) capacitance and account only on JFet's g-s capacitance , multiplied with number of JFets in parallel
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Old 15th May 2018, 04:34 PM   #175
kamis is offline kamis  Serbia
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Quote:
Originally Posted by Zen Mod View Post
considering that input JFets are cascoded , you can practically exclude Miller (effect on) capacitance and account only on JFet's g-s capacitance , multiplied with number of JFets in parallel
Thank you. But there is no g-s capacitance specification in 2sk389 datasheet.
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Old 15th May 2018, 04:38 PM   #176
Zen Mod is offline Zen Mod  Serbia
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what's with Crs and Cis data?
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