6V6 line preamp - Page 43 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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

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 12th January 2012, 08:19 PM   #421
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Quote:
Originally Posted by buzzforb View Post
Thanks for the info stajo. I got the stuff for seperate filters for each B+ using CRC of 4.7uF/220r/470uF. The trafo is a 200Va toroid with dual 300V and 6.3V secondaries.
I might have missed something here but with just a 220R your B+ will hit the roof. I'd say around 1,5 k with SS bridge for 340 B+. Or are you using regulator?

Btw what output caps was recommended? Ive seen from 0,68 to 2,2k.

Staffan

Last edited by stajo; 12th January 2012 at 08:42 PM.
  Reply With Quote
Old 12th January 2012, 08:32 PM   #422
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
buzz

use PSUD

it's made for that



better late than sorry ...
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 12th January 2012, 08:38 PM   #423
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Salas View Post
220uF 220R 220uF I would say as minimum cheap CRC (with solid state bridge). When planning a reg it suffices. If you can make it CLC it tends to sound better. But the choke should be a man at >100mA constant current. 5-10H. If you will put the fiter in another box, use a 10uF MKP or MKT very near the reg's input to ground for decoupling.
This is what i was going by. This will be a prefilter to sshv2 for B+. I will sim to make sure all is ok. I didnt consder that th eorder of things would affect output
  Reply With Quote
Old 12th January 2012, 08:49 PM   #424
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simulate with 65mA current drain in the end of Duncan's when you are to use ~45mA on two tubes plus 20mA for the reg. 350V is OK for 330-335V steady reg output. Key is you input correct losses in the transformer it simulates so to go near its actual secondary value when loaded as above.
  Reply With Quote
Old 12th January 2012, 09:02 PM   #425
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Input for Duncan's is 300V secondary with 56R as series resistance(figured by Duncan),into SF4007(1n4007), then on to 4.7uF/220R/470uF into 5k load(preset value). This gives 360V at 65mA. If i change the load resitance, things change dramatically.(voltage increases with increasing resistance)which makes since to me.

Last edited by buzzforb; 12th January 2012 at 09:06 PM.
  Reply With Quote
Old 12th January 2012, 09:09 PM   #426
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
360V at 5K is 72mA drain to earth. There are current drains also in Duncan's (circles with a down pointing arrow), use one at 65mA as termination and delete any load resistor.
  Reply With Quote
Old 12th January 2012, 09:21 PM   #427
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Salas View Post
360V at 5K is 72mA drain to earth. There are current drains also in Duncan's (circles with a down pointing arrow), use one at 65mA as termination and delete any load resistor.
72mA is what it shows as max. 67 it is calling RMS. I am using PSUD II.they allow Current tap vs resistive load. Using Current tap set at 65mA yelds almost exact results.

Last edited by buzzforb; 12th January 2012 at 09:23 PM.
  Reply With Quote
Old 12th January 2012, 09:28 PM   #428
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
OK then since it shows it as max. Anyway when a real trafo with real tolerances and the wall power tolerance comes into play you can always tune drop with an extra resistor to where is convenient for all considerations. A longer trouser can always be made shorter, so speculating on the plenty side is safe.
  Reply With Quote
Old 19th January 2012, 10:58 AM   #429
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Salas,
Have you ever played NOs 5687 tubes?
  Reply With Quote
Old 23rd January 2012, 07:40 PM   #430
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Soon to be 6V6!. Aluminum (sides and middle) mixed with walnut wood(tube are).
Attached Images
File Type: jpg 6V6.jpg (28.7 KB, 463 views)
  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
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 12:37 PM.


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