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 19th October 2003, 01:54 PM   #21
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
More variations - unknown japanese origin
Attached Images
File Type: jpg cr-eq3circuit.jpg (64.5 KB, 3803 views)
  Reply With Quote
Old 19th October 2003, 03:51 PM   #22
diyAudio Member
 
Onvinyl's Avatar
 
Join Date: Aug 2002
Location: Germany
Quote:
Konnichiwa,
quote:
Originally posted by Onvinyl
Thorsten's suggestions seem to be inspired of klaus boening's design, I think...


I think not.
hu, no offence meant. In what respects does the new circuit sound different?
Rüdiger
  Reply With Quote
Old 19th October 2003, 04:35 PM   #23
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Konnichiwa,

Quote:
Originally posted by Onvinyl


hu, no offence meant. In what respects does the new circuit sound different?
We have only build this cascoded, I simply drew in the Buffers as well and re-did the RIAA as it was discussed.... The cascoded circuit with the correct RIAA sounds cleaner than the original, more open and can handle complex passages better. I normally try to leave buffers out as much as possible as they rarely improve the sound.

Sayonara
  Reply With Quote
Old 19th October 2003, 05:27 PM   #24
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Kuei

What is your stance on splitting the riaa? If one is to have a third stage for extra gain would it be beneficial to separate the timeconstants? I seem to always prefer the sound when they're separated but usually there are way too many variables to make a direct comparison.
  Reply With Quote
Old 19th October 2003, 06:08 PM   #25
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Konnichiwa,

Quote:
Originally posted by analog_sa
What is your stance on splitting the riaa? If one is to have a third stage for extra gain would it be beneficial to separate the timeconstants? I seem to always prefer the sound when they're separated but usually there are way too many variables to make a direct comparison.
If you have three stages spliting the timeconstants can be better. Adding a stage only to split the RIAA is not a good idea however. Also, there are several ways to realise a "one go" RIAA and some sound better than others. I prefer the style applied by Kondo San in his Phonostages....

Sayonara
  Reply With Quote
Old 19th October 2003, 08:48 PM   #26
Marinos is offline Marinos  Greece
diyAudio Member
 
Marinos's Avatar
 
Join Date: Mar 2003
Location: Athens
Hi all,
Thank you for your replies

Kuei,
another setup could be

- Simple cascode for the 1st stage and subtracting the drain resistor value from the first RIAA resistor.

- Cascode + follower for the second in order to have better drive capability for the interconnects and lower output impendance.

Right ?

Adding a selector, a pot and a 3rd Cascode + Follower we have a very nice and compact (psu in a separate case) Preamplifier.

Right ?
__________________
Marinos
  Reply With Quote
Old 19th October 2003, 11:14 PM   #27
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Konniciwa,

Quote:
Originally posted by Marinos
another setup could be

- Simple cascode for the 1st stage and subtracting the drain resistor value from the first RIAA resistor.

- Cascode + follower for the second in order to have better drive capability for the interconnects and lower output impendance.

Right ?
Right.

Quote:
Originally posted by Marinos
Adding a selector, a pot and a 3rd Cascode + Follower we have a very nice and compact (psu in a separate case) Preamplifier.

Right ?
You would need a different FET (IMHO) for the Linestage, lower transconductance and higher gate cutoff Voltage, a linestage with 36db gain re than a little excessive if you ask me....

Sayonara
  Reply With Quote
Old 20th October 2003, 06:06 AM   #28
Marinos is offline Marinos  Greece
diyAudio Member
 
Marinos's Avatar
 
Join Date: Mar 2003
Location: Athens
Default Fet Line stage

Hi kuei

Have you tried something similar?

Any suggestions for such a FET? Are the europian OK or should I search the Toshiba family ?

Could such a Line stage compete sonicaly my SE 6BX7 preamp ?
__________________
Marinos
  Reply With Quote
Old 20th October 2003, 09:00 AM   #29
Werner is offline Werner  Europe
diyAudio Member
 
Join Date: Jan 2002
Location: Belgium
A sketch that reflects my present feelings about this kind of circuit. Optimised for the 100nF MKVs I have. YMMV.
Attached Images
File Type: jpg fet_phono_100n.jpg (58.4 KB, 2823 views)
  Reply With Quote
Old 20th October 2003, 09:30 AM   #30
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Q1, Que? I'll gues the schematic is drawn wrong?
__________________
/Per-Anders (my first name) or P-A as my friends call me
Tube Buffered Gainclone in work |Thread || Diamond buffer |Thread for the group buy | Wiki
  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
Needs simple RIAA pre-amp parmar664 Analogue Source 2 30th March 2007 10:29 PM
GC/RIAA (simple) preamplifer veteran Chip Amps 22 13th June 2006 08:31 PM
Simple PSU for RIAA / m-magnet lykkedk Solid State 0 16th October 2004 03:18 PM
Another Simple RIAA preamp ? CheffDeGaar Analogue Source 7 10th February 2004 10:34 AM
Simple RIAA amp from c't magazine lohk Analogue Source 46 23rd January 2003 08:44 PM


New To Site? Need Help?

All times are GMT. The time now is 06:16 AM.


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