hi again! I just wanted to see if someone could help me out with my previous questions so I can finish ordering the rest of my parts this weekend.
Thanks again!
Thanks again!
Hi,
you could try a 6,3Volt BG NX
the 4,02 is only important if you want the specified gain. 3,9 should be ok as should 470R instead of 475R.
The output filter cap Cu (or C48) forms a lowpass filter with a quite high pole. I don´t think this is critical and would use 580pf (it wasn´t even installed in the first two revisions)
William
you could try a 6,3Volt BG NX
the 4,02 is only important if you want the specified gain. 3,9 should be ok as should 470R instead of 475R.
The output filter cap Cu (or C48) forms a lowpass filter with a quite high pole. I don´t think this is critical and would use 580pf (it wasn´t even installed in the first two revisions)
William
so, is there a posted formula to calculate the gain for the Ono to see what this resistor substitution would do?
Hi,
well it would do something like 3,9/4,02 = 0,26dB less wich is not really important I think😉
William
well it would do something like 3,9/4,02 = 0,26dB less wich is not really important I think😉
William
ideal standby current for the 2sk389
hi all,
hath anybody search for the best standby current for the Q5 (2sk389) ? I think it is very important for the sound!
I read sometimes 4,5 - 5mA standby current for each Cannel it's the best for a natural sound.
Look at (in german):
http://www.audiomap.de/forum/index.php?az=printer_friendly&forum=116&topic_id=15097
What is the actual standby current?
cu
hi all,
hath anybody search for the best standby current for the Q5 (2sk389) ? I think it is very important for the sound!
I read sometimes 4,5 - 5mA standby current for each Cannel it's the best for a natural sound.
Look at (in german):
http://www.audiomap.de/forum/index.php?az=printer_friendly&forum=116&topic_id=15097
What is the actual standby current?
cu
Do you realise that they are talking about a completely different circuit? Why don't you build the Ono as designed and then play with the parameters later?
Hi,
i'm build the Xono just now. Some train of thoughts in the posts are new for me (LED for D5 are better when some diodes, ...).
But i think some important settings have been ignored.
The link above is from a DAC project, but on full bottom he tells from the difference for the standby current of the 2sk389.
up to 3mA = powerless
6mA and more = sharp
Is it important for us? - your choose!
cu
i'm build the Xono just now. Some train of thoughts in the posts are new for me (LED for D5 are better when some diodes, ...).
But i think some important settings have been ignored.
The link above is from a DAC project, but on full bottom he tells from the difference for the standby current of the 2sk389.
up to 3mA = powerless
6mA and more = sharp
Is it important for us? - your choose!
cu
Dear All,
I recognized to have a stereo pcb for Xono and a pcb set for Dragan´s 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 I´m a bit undecided about those coupling caps and the type of resitors I should go for.
Thus I´m 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 I´m asking about the combination for coupling caps for C10, C19, C37 on Dragan´s 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 didn´t find any sourcing option. Second options should be
Which of these options would you go for and what do you expect sound-wise from this options?
Many thanks in advance
I recognized to have a stereo pcb for Xono and a pcb set for Dragan´s 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 I´m a bit undecided about those coupling caps and the type of resitors I should go for.
Thus I´m 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 I´m asking about the combination for coupling caps for C10, C19, C37 on Dragan´s 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 didn´t 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
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.
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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