Go Back   Home > Forums > >

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Modification of MHZS CD players
Modification of MHZS CD players
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
Old 18th September 2021, 07:31 AM   #181
tonimxp is offline tonimxp  Italy
diyAudio Member
 
Join Date: Oct 2007
Location: Adelfia (BA)
I found wrote ecc88 can work fine with V plate 150v or so.
Can ecc88 to be a alternative tube for solve my problema?
  Reply With Quote
Old 18th September 2021, 09:40 AM   #182
McGyver is offline McGyver  Poland
diyAudio Member
 
McGyver's Avatar
 
Join Date: Nov 2004
Location: Poland
ECC88 has different pinout and much more gain than 12AU7.
  Reply With Quote
Old 18th September 2021, 11:52 AM   #183
tonimxp is offline tonimxp  Italy
diyAudio Member
 
Join Date: Oct 2007
Location: Adelfia (BA)
Quote:
Originally Posted by McGyver View Post
Second cathode resistor could be 47k/2W also.
The gain will be about 8.
I need gain =1 becouse input tube stage is already 2.2 Vrms and in out i have 2.7 Vrms

instead input opamp is 1 Vrms so opamp gain=2 or so
  Reply With Quote
Old 18th September 2021, 01:03 PM   #184
McGyver is offline McGyver  Poland
diyAudio Member
 
McGyver's Avatar
 
Join Date: Nov 2004
Location: Poland
You need to omit an opamp and to obtain gain of 2. Wchich is difficult to get with popular small tubes without negative feedback.
You may obtain the gain about 3 with 12B4A tube, but default power supply is insufficient.
  Reply With Quote
Old 18th September 2021, 01:24 PM   #185
tonimxp is offline tonimxp  Italy
diyAudio Member
 
Join Date: Oct 2007
Location: Adelfia (BA)
This Is what already happens with the configuration of my post 177, so gain Is ok.
I also saw that at your post 18 you used ecc88 with 120V , what Is the gain in ecc88 your solution of post 18?
Thanks
  Reply With Quote
Old 18th September 2021, 01:57 PM   #186
McGyver is offline McGyver  Poland
diyAudio Member
 
McGyver's Avatar
 
Join Date: Nov 2004
Location: Poland
Quote:
Originally Posted by tonimxp View Post
I also saw that at your post 18 you used ecc88 with 120V , what Is the gain in ecc88 your solution of post 18?
Thanks
It was eleven years ago, I do not remember it clearly enough.
When I look at it after several years, I can see that it could be done much better.
  Reply to this post

Reply


Modification of MHZS CD playersHide this!Advertise here!
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
List of Mod-able CD Players DreadPirate Digital Source 2 26th February 2012 06:22 PM
Quality of Mp3 Players ! -_nando-_ Everything Else 21 1st May 2006 05:42 PM
CD Players deanbo Digital Source 3 25th July 2005 05:57 AM
CD & DVD players f.s. Cobra2 Swap Meet 6 16th March 2004 07:26 AM


New To Site? Need Help?

All times are GMT. The time now is 06:49 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki