Simplistic NJFET RIAA - Page 749 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 26th March 2012, 09:51 PM   #7481
evanc is online now evanc  United States
diyAudio Member
 
Join Date: Sep 2009
Location: New Jersey. About 1 hour from NYC and 1 min. from the beach
I got a chance to sit and listen over the last couple of days and here's the report.

First a build summery. 2 BIB regulators, parts and boards from tea bag. Nichicon kg10,000uf smoothing caps and 10r current setting resistors. 2 strands of cat 5 wire per connection about 5" long run to the riaa board. I noticed no difference from wires twice this length. Antek 50 va transformer.

The riaa circuit is 43db gain. My cart output is 2.5mv. prp resistors except for the 47k leading from the first stage to the riaa filter. this is a z foil. russian ft3 teflon for 100nf and 47 nf and pio k42 for 15 nf. The output cap is pio k75-10 2.2 uf bypassed with 100 nf ft3. nichicon muse for the electrolytics.
russian caps from Tubes-Store.com - Vacuum tubes, capacitors, nixie, sockets. Wholesale & retail trade. Worldwide shipping.
chassis from Amp Chassis
jfets from FET Audio | Hi-End Audio Projects
prp from Sonic Craft High-End DIY Audio Parts

Now the sound. The stereo image is excellent. I had enough caps to get good matches. The sense of space puts my cd player to shame. The bass carries a lot more weight then my previous build. Detail is also excellent. The buzz of a guitar string, or the wind in a voice. The unit is totally silent, no hum or rushing sound with the volume all the way up and no music playing. The biggest thing I notice is what I'll call snap...the snare drum or sounds soooo good.
As it stands my system is the best it has ever been. This is thanks to the excellent info and help I have found here. I'll drink a beer to you and say thanks...
Evan
__________________
http://www.evancotler.com
  Reply With Quote
Old 26th March 2012, 10:14 PM   #7482
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
  Reply With Quote
Old 27th March 2012, 08:20 PM   #7483
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Quote:
Originally Posted by AndrewT View Post
if the Neutral line fuse blows, there is a high risk that the chassis can be LIVE, even though the equipment "sounds" dead.
Nice comment
__________________
RC
  Reply With Quote
Old 29th March 2012, 09:59 PM   #7484
atupi is offline atupi  Romania
diyAudio Member
 
Join Date: Oct 2010
Location: Bucharest
My preamp is build with cheap resistors and i want to buy some good ones from mouser website. What kind of resistors should i order: carbon film, metal film, something else ?
  Reply With Quote
Old 29th March 2012, 10:52 PM   #7485
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by atupi View Post
My preamp is build with cheap resistors and i want to buy some good ones from mouser website. What kind of resistors should i order: carbon film, metal film, something else ?
RIAA look for precision: low tolerance & low ppm (bulk metal foil by Vishay).
  Reply With Quote
Old 2nd April 2012, 09:26 PM   #7486
orelli is offline orelli  Italy
diyAudio Member
 
Join Date: Aug 2008
Location: Correggio, Italia
Send a message via AIM to orelli Send a message via MSN to orelli Send a message via Yahoo to orelli
does someone compared Vishay VTA55( bulk metal foil) versus Z foil?
  Reply With Quote
Old 2nd April 2012, 09:27 PM   #7487
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
I compared Vishay S102K versus naked Tx2575 Z foil, better naked Z foil.
  Reply With Quote
Old 3rd April 2012, 07:18 PM   #7488
orelli is offline orelli  Italy
diyAudio Member
 
Join Date: Aug 2008
Location: Correggio, Italia
Send a message via AIM to orelli Send a message via MSN to orelli Send a message via Yahoo to orelli
Thanks
  Reply With Quote
Old 3rd April 2012, 07:21 PM   #7489
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by orelli View Post
Thanks
Where do you want to use the Vishay, I supposed RIAA but if isn't RIAA: for example other critical part like load I prefer Shinkoh. so all depends resistor application.

Cari saluti / Best regards

Felipe
  Reply With Quote
Old 6th April 2012, 04:36 PM   #7490
Djinn is offline Djinn  Norway
diyAudio Member
 
Join Date: Mar 2010
Red face hFE on BC550C on eBay (yes I know this is is a chance to take)

I have bought some BC550C on eBay and I used the schematic under for the the NPN, and calculated the hFE to match in pairs. the measurements varied between 246 and 314, and there was many good pairs .

Then I took one of the BC550C from the "BIB set for the Salas 1.1" and this one measured 474, so are the ones I bought good enough, and should I buy a load from the quality vendors? The ones I bought have a silver front, with black marking " C550C PH 99 ", are these good enough and not fake of some sort?

With kind regards

Martin

Click the image to open in full size.
  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



New To Site? Need Help?

All times are GMT. The time now is 08:54 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