Ono semi substitutions and other Q's - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st February 2006, 10:10 PM   #1
sbear is offline sbear  United States
diyAudio Member
 
Join Date: Jul 2004
Location: Lawrence, KS
Default Ono semi substitutions and other Q's

Well everybody, I am almost done sourcing all the parts for an Aleph-Ono, but I have a few very specific questions I can't seem to find answers for, or incomplete answers.

2sk170- There has been some debate as to the designation BL, GR, or V. Can someone confirm which "color" is correct? Or does it matter? Can I sub anything else?

2sk389- same Q as above- BL, GR, V, or does it matter? Subs?

2sc1844/2sa991- These are somewhat difficult to get, but they appear to be somewhat of a "generic" part. Are the ztx450/ztx550 an appropriate substitution throughout the circuit, or are there better substitutions?

The RIAA filter, (C4,5,6 and R8,9) any advice as to part choices here? Especially for the caps? Someone has mentioned teflon, others polystyrene, others polypropylene? Also, how precise do R8,9 need to be-1%,2%, 0.1%, does it matter?

These are the only parts I haven't decided on. As soon as I get these figured out (and I get my tax return back) It's time to build!

Thanks.
  Reply With Quote
Old 2nd February 2006, 10:02 AM   #2
diyAudio Member
 
wuffwaff's Avatar
 
Join Date: Aug 2001
Location: Ingolstadt Germany
Hi,

for the 2sk170 youŽll need the GR. Otherwise the current will be too high and you will have a too big voltage drop over the drain resistor. The alternative is to change the source resistors or not to use the high gain setting (76dB). I used BL specs and changed the source resistors a bit. I also disabled the high gain setting wich is normally not needed.

The 2sk389 is not critical as it is fed by a current source at 2mA Here you could probaly use a GR or BL

You can use BC550c/560c or the ztx450/550 watch out if the pins are the same

For C4/5/6 I used ERO MKP 1%, R8 and R9 1%. It does matter how precise but 1% should be enough.

IŽve got a list of the precise parts IŽve used. If you need it you can sent me an email.

William
__________________
een ooievaar is geen konijn want zijn oren zijn te klein!
  Reply With Quote
Old 3rd February 2006, 01:09 AM   #3
sbear is offline sbear  United States
diyAudio Member
 
Join Date: Jul 2004
Location: Lawrence, KS
Thanks wuff, I don't think it is ERO caps are easily available in the US, so I think I will just go with some panasonic polypropylene film. (They were the only decent 1% caps available at the big supply houses here) I did find some 5% polystyrene caps, but I can't find them with a better tolerance. I might try them anyway to see how they sound. Thanks for the info on the FET's; GR it is.
I would like to see your parts list just to see how ours differ.
  Reply With Quote
Old 3rd February 2006, 06:24 AM   #4
diyAudio Member
 
wuffwaff's Avatar
 
Join Date: Aug 2001
Location: Ingolstadt Germany
just sent me an email and I will return the list.

William
__________________
een ooievaar is geen konijn want zijn oren zijn te klein!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tube DI Help, Please: Substitutions slor Tubes / Valves 0 12th April 2008 02:20 AM
JLH 10W audio amp help with parts substitutions kiram9 Solid State 9 6th August 2006 10:08 PM
Supertex Mosfet substitutions teknofossil Solid State 10 5th May 2005 10:59 AM
Tube substitutions in Heathkit W5M billinchile Tubes / Valves 9 8th October 2004 02:21 AM
Help with transistor substitutions trwh Solid State 8 10th September 2002 04:49 PM


New To Site? Need Help?

All times are GMT. The time now is 12:37 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2