GPP - Great Phono Preamp GPP - Great Phono Preamp - Page 12 - diyAudio
Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

GPP - Great Phono Preamp
GPP - Great Phono Preamp
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 4th April 2013, 08:43 PM   #111
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
GPP - Great Phono Preamp
Please read several posts above, you will hardly get an answer:

"syn08
Account disabled at member's request

Join Date: Aug 2005
Location: Toronto"
  Reply With Quote
Old 4th April 2013, 09:36 PM   #112
BC is offline BC  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Milwaukee,Wisconsin-USA
Default LP797 MC/MM

Thanks PMA. Sad to hear. Well, I viewed all previous posts came up with this:
"for switching the gain (MC/MM) in the second stage (where everything is already at 20-30mV)" he mentions a relay which I see on his schematic and it is not clear to me.

Oh well...if some patient person can spell it out for me, great. When I see Mr. Jung's phono pre using LT1115 in the data sheet for LT1115, switching in/out MM and MC makes total visual and electronic sense to me.

Again, any one else wants to take a shot, I would appreciate it.

Bruce
__________________
Everything is relative to something. A key to communication is agreeing on a reference point.
  Reply With Quote
Old 4th April 2013, 10:08 PM   #113
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Ground/Open.
__________________
It doesn't count how one deals with winning, but how to handle a loss (© DjT)
https://www.youtube.com/watch?v=FJEzEDMqXQQ
  Reply With Quote
Old 4th April 2013, 10:41 PM   #114
BC is offline BC  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Milwaukee,Wisconsin-USA
Default LP797 simplicity

Thanks Jacco.

Bruce
__________________
Everything is relative to something. A key to communication is agreeing on a reference point.
  Reply With Quote
Old 4th April 2013, 10:50 PM   #115
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
No problem.

You could have figured yourself that the gain should differ 10x (20dB)

Afair, the value across the opamp is 1K.
say : R1 is the always-in gain setting resistor for MM.
And R2 for the switched one.

Gain MM : 1K/R1 + 1

1/R3 = 1/R1 + 1/R2
Gain MC : 1K/R3 + 1

(afair from Mr Colin's article, gain difference between the MM and MC setting is 19.93dB)
__________________
It doesn't count how one deals with winning, but how to handle a loss (© DjT)
https://www.youtube.com/watch?v=FJEzEDMqXQQ

Last edited by jacco vermeulen; 4th April 2013 at 10:54 PM.
  Reply With Quote

Reply


GPP - Great Phono PreampHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 09:51 PM
Electret mic preamp - will phono preamp work? darthmullet Analogue Source 6 12th October 2007 07:32 AM
Looking for a great DIY-Preamp for MICs (48v) TobWen Tubes / Valves 12 29th February 2004 09:50 PM
Phono Preamp. victor Pass Labs 0 24th October 2001 07:11 AM


New To Site? Need Help?

All times are GMT. The time now is 08:49 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki