Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

6V6 line preamp
6V6 line 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 5th February 2014, 10:31 PM   #2511
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
6V6 line preamp
Quote:
Originally Posted by JimT View Post
Thanks
Jim
We possibly crossposted.
  Reply With Quote
Old 8th April 2014, 07:18 PM   #2512
gtoro is offline gtoro
diyAudio Member
 
Join Date: May 2012
Hi folks , a question about a hum noise in buffer circuit with a simple crc+ 2last separate rc for each channel. I'm no surprise for litle noise with this kind of supply, but the noise go down a lot at maximum volume without and song is very clear the change of level...
Could somebody light me about?
Thanks a lot for any answer ...
  Reply With Quote
Old 8th April 2014, 07:45 PM   #2513
fdegrove is offline fdegrove  Europe
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Not sure I understand but are you certain you have the volume control wired up correctly?

Ciao,
__________________
Frank
  Reply With Quote
Old 8th April 2014, 08:16 PM   #2514
gtoro is offline gtoro
diyAudio Member
 
Join Date: May 2012
I think Was right i Can control level simpy the noise when the pot is in position without attenuation go down somebody db at my (not only) ear
  Reply With Quote
Old 9th April 2014, 01:27 AM   #2515
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
6V6 line preamp
The pot needs its body grounded also. Revisit the grounding scheme.
  Reply With Quote
Old 9th April 2014, 07:59 AM   #2516
gtoro is offline gtoro
diyAudio Member
 
Join Date: May 2012
The pot is an blue alpls, the cover is mainly in plastic i have to ground the upper side? I'll try this evening thanks a lot!
the sound it's very good! I'll try with SE EL34 and with a little T-amp and result was fantastic gain in deep, detail and "body" of sound..., I'm thinkng to separate in two cabinet pre and supply for give him in future the chance of better supply based on your circuit.
  Reply With Quote
Old 9th April 2014, 08:19 AM   #2517
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
6V6 line preamp
The Alps face plate is metal. It usually grounds when mounted to a zero referenced chassis. When not like that, use a collar and a ground wire.
  Reply With Quote
Old 9th April 2014, 08:22 AM   #2518
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
6V6 line preamp
P.S. About the sound congratulations. It will be even better when you will finish with all the build details. Better PSU is always a plus also. Post us some pictures when done.
  Reply With Quote
Old 11th April 2014, 04:43 PM   #2519
buzzforb is offline buzzforb  United States
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Salas,
Time to rebuild the 6v6 preamp and I had a couple of questions. If I wanted to have balanced out, would it be smarter to use a unity gain phase splitter like the one found in the impasse, or a transformer? Would a standard 600: 600 transformer work on the output or would it cause issue? Lastly, have you had a chance to listen to the Amtrans Carbon Film?
__________________
...Shape the sound , Man!
  Reply With Quote
Old 11th April 2014, 04:58 PM   #2520
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
6V6 line preamp
Such Tx would load down the gain version's higher than 600R Zo. Better an active splitter, or step down 5k primary Tx instead of resistor anode load with balanced secondary. Given that your system gain allows 1:3 gain loss at the pre. Line noise will go down accordingly as microphony also nonetheless.

*No use of Amtrans yet. BTW they have given good feedback on it in the phono thread but they ultimately preferred the very low ppm foil and the non inductive ww very low ppm too. But in no power demanding locations.
  Reply With Quote

Reply


6V6 line 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
Help me design my DAC/Line Preamp. kuroguy Tubes / Valves 7 2nd April 2009 08:31 PM
preamp line ctt richwalters Tubes / Valves 1 7th March 2008 04:34 PM
Preamp for Line In and Mic blur Instruments and Amps 1 4th January 2007 04:02 PM
Line stage preamp, based on SY's "Heretical Unity gain line stage" Danko Tubes / Valves 23 18th July 2005 04:07 AM
Line preamp for 2A3 amp Petman Tubes / Valves 0 24th May 2002 03:11 PM


New To Site? Need Help?

All times are GMT. The time now is 03:03 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki