Paradise Builders - Page 87 - 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 6th January 2013, 09:15 PM   #861
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Yes, the Paradise is made for MC cartridges and not for MM cartridges.
Ricardo, i do put a cap parallel to the input some times.
It is not entirely clear at this moment if high hfe BJTs anywhere in the circuit provokes oscillation. There are Paradise builds out there that do not have that problem although high hfe BJTs are used.
  Reply With Quote
Old 6th January 2013, 09:19 PM   #862
Waly is offline Waly  United Kingdom
diyAudio Member
 
Waly's Avatar
 
Join Date: Jan 2011
Location: London
Quote:
Originally Posted by RCruz View Post
Now your comment about 100p on the input is quite good... would you please elaborate on why to use it ?
The paradise has huge amounts of local feedback, and that may create local instabilities. Because of the high beta of the input devices, combined with the huge transconductance, the input stage is in particular prone to such. An input cap will kill an important regenerative path.
  Reply With Quote
Old 6th January 2013, 09:41 PM   #863
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Thank you both.

I built it with all bjt with hfe higher than 550.... works wondefully.... took some time to lower output offset from 40mV to 5mv (48hours) but thatīs it.
__________________
RC
  Reply With Quote
Old 7th January 2013, 09:07 AM   #864
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Quote:
Originally Posted by Abraxas336 View Post
What are "formed capacitors"? What is a "317"?


Simon is quite right of course now for same more details.

Build a little power supply with a LM317 set the voltage to the nominal capacitor voltage and connect all the capacitors to it.

Let the capacitors stay there for a while (1 or 2 days) and this will form the capacitors.

Once the capacitors are charged they will use very little current so you can plug in as many as you like with no problems.

No need for any fancy stuff a litle breadboard is plenty

If you don't have a breadboard this is a link for it
WB-DJ - WISHER - BREAD BOARD, WB-DJ | Farnell United Kingdom
Attached Images
File Type: jpg forming capacitors 001.jpg (618.8 KB, 237 views)
  Reply With Quote
Old 7th January 2013, 09:25 AM   #865
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Quote:
Originally Posted by Waly View Post
Fearmonger indeed. Not a chance in hell to kill a 2k cartridge with the paradise input bias current.

No idea how you came up with the 2kohm fantasy. I had clearly stated that so far i have only experimented with a Denon 103 mainly due to its expendability. It may not be ideal for the purpose but noise levels are just not acceptable.

Hence my suspicion for oscillations. Or i have an unusually noisy batch of transistors. My scope is quite old and useless 60MHz unit. Hope to have a 200MHz within a month and then will have another look at the output.
  Reply With Quote
Old 7th January 2013, 09:38 AM   #866
hesener is offline hesener  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Munich, Germany
analog_sa. I would still be interested in looking at your boards, if you don't mind the shipping ( I will cover the cost). Have a 3GHz analyzer available....
  Reply With Quote
Old 7th January 2013, 09:41 AM   #867
hesener is offline hesener  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Munich, Germany
Quote:
Originally Posted by Take5 View Post
One step beyond: impatient i build up a psu with stock parts of my shelf. Works better like the lipo batteries, no hum, no noise, iīm amazed about the silence.

I think itīs also the result of the shunt regulator design, thank you FdW!



Next step: sending some bucks to italy, buying some cases. I want build it up like my sold pass pearl:



Chris

Hi Chris, just for the record - I have a Pearl II as well, and I am not going back ;-)
  Reply With Quote
Old 7th January 2013, 10:04 AM   #868
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Quote:
Originally Posted by hesener View Post
analog_sa. I would still be interested in looking at your boards, if you don't mind the shipping ( I will cover the cost). Have a 3GHz analyzer available....

Appreciate your kind offer and absolutely no need to cover cost of shipping. I was just hoping that someone in your more immediate neighbourhood may have similar symptoms but apparently not many feel the rush to finish this project Lets give it another week or so... Again, appreciated.
  Reply With Quote
Old 7th January 2013, 10:06 AM   #869
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Dear anolog_sa
sorry dude but I do not care much for your attitude in post 865
You are now with PMA on my ignore list.
I like this tread quite a lot and is better if is free from primadonnas
Post as much crap as you wish (I do ) but keep this constructive please
Most like me are just learning (my first BJT build of this size)
Have a look at post 867 is well worth the effort.

Altrought I don't have pearl II but that is most certanly in my list of things to build.
Maybe just another Pear and Orranges thing....

Last edited by Bksabath; 7th January 2013 at 10:10 AM.
  Reply With Quote
Old 7th January 2013, 10:29 AM   #870
Take5 is offline Take5  Germany
diyAudio Member
 
Join Date: Jan 2005
Location: Heidelberg
Quote:
Originally Posted by analog_sa View Post
I had clearly stated that so far i have only experimented with a Denon 103 mainly due to its expendability. It may not be ideal for the purpose but noise levels are just not acceptable.
Already wrote it. I also use a DL 103 and at the first try i have big problems with noise. It was a ground problem, could controll it with seperate psu for both boards. Ground of the turntabe connect to ground of one board.

Now, no hum, no noise!

@Alfred
right choise ;-)

Chris

Last edited by Take5; 7th January 2013 at 10:31 AM.
  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
Paradise phono stage hesener Group Buys 1309 25th June 2014 03:23 PM
DIY Paradise - Any good to buy from? gingerpimp0069 Vendor's Bazaar 7 21st June 2007 02:07 PM
DIY Paradise Charlize Jolojl Swap Meet 7 7th December 2006 06:42 AM
Diy Paradise! alexmoose Tubes / Valves 3 24th July 2006 04:37 AM
Another way to paradise ? Bernhard Pass Labs 3 8th August 2003 10:19 PM


New To Site? Need Help?

All times are GMT. The time now is 06:28 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2