6V6 line preamp - Page 109 - 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 9th September 2012, 12:23 PM   #1081
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
it will be witty - tossing out one series 470R , and connecting one adequate shunt R on output

it will relax 6L6/TL combo operation
__________________
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 9th September 2012, 03:28 PM   #1082
harlee is offline harlee  Singapore
diyAudio Member
 
Join Date: Nov 2006
Quote:
Originally Posted by Salas View Post
Nice, thanks. Effective solutions for box space and cost. Congratulations for finishing it. Those green Russian output capacitors were marrying happily with FT-3 0.1uF Russian Teflon bypass in some older experiments I did, maybe you can try if you got any. I should see to run a spice sim about the 6L6GC & TL431 schematic if I can get the models. Is the heater reg voltage source or current source?
What amp and speakers you drive with this preamp? What you had before in its place?
I have FT-3 0.22uF, will try later.
Regarding the shunt reg sim, I would like to know, thanks.
The heater reg is a simple 7812 reg, current source worth to try?
I have a Matisse Fantasy clone, difference is thicker mid but a bit rough sounding comparatively to the 6V6 line amp.
Power amp is Aragon Palladium, and speaker is ATC SCM 50P.
  Reply With Quote
Old 9th September 2012, 04:57 PM   #1083
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Let us know what happened with those FT-3.
It got a bit more flowing with the 317 as Isource like in page 81 schematic, 2x. Will take about a minute to come up. Slow heat up. Can be good for NOS 6V6 long life though. Talking about tubes those are distinguishable in such a circuit. What make are those smoked glass ones in your photo? Exchange some brands if you have around or can lend from friends to taste.
  Reply With Quote
Old 10th September 2012, 01:59 AM   #1084
harlee is offline harlee  Singapore
diyAudio Member
 
Join Date: Nov 2006
Hi Salas, a good recommendation to parallel with FT-3, the mid came through with the smooth delicate high, overall a more balance presentation, I love it.
Will change to current when I have time.
Those smoke bottles are Sylvania, have another 2 pairs, Hytrel & GM Genuine Parts, the GM sound quite similar to Sylvania, rebrand maybe?
Just for the record, I used 2 point grounding like Sakuma. Absolutely no audible hum, at least in my system.
  Reply With Quote
Old 10th September 2012, 02:45 AM   #1085
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Sakuma was talking the same thing as American engineers call bus bar grounding?
  Reply With Quote
Old 10th September 2012, 02:58 AM   #1086
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Possibly rebranding yes. Sylvania is good, I liked a bit more the Miniwatt. RCA should be the best, haven't got any, many others say so. The Tungsol reissue new one is very good.
  Reply With Quote
Old 10th September 2012, 03:27 AM   #1087
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Quick question -

I have a transformer that has a 6.3v 2A filament winding, and it also has a 5v 2A filament winding.

The B+ winding is only 540v CT so there isn't enough extra to use a tube rectifier.

My question is this - is there any problem making both of the fil windings go into a voltage doubler and then their own regulator, each lighting one 6V6? I.E., using the two windings to heat two tubes? (because one winding by itself cant do both...)

It seems like an efficient use of the transformer.
  Reply With Quote
Old 10th September 2012, 03:31 AM   #1088
harlee is offline harlee  Singapore
diyAudio Member
 
Join Date: Nov 2006
Quote:
Originally Posted by Salas View Post
Sakuma was talking the same thing as American engineers call bus bar grounding?
Not too sure, but what I did was tie all signal ground + heater ground together, connect to chassis near input point, psu ground to chassis at one of the transformer mounting screw. It's quiet.
  Reply With Quote
Old 10th September 2012, 05:06 AM   #1089
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
What is your B+ PSU DC right after the rectifier diodes across the first smoothing capacitor? Also using a 7812 for heaters means you strung them in series?
  Reply With Quote
Old 10th September 2012, 05:11 AM   #1090
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by 6L6 View Post
Quick question -

I have a transformer that has a 6.3v 2A filament winding, and it also has a 5v 2A filament winding.

The B+ winding is only 540v CT so there isn't enough extra to use a tube rectifier.

My question is this - is there any problem making both of the fil windings go into a voltage doubler and then their own regulator, each lighting one 6V6? I.E., using the two windings to heat two tubes? (because one winding by itself cant do both...)

It seems like an efficient use of the transformer.
No problem, bit better isolation even. Its the same for the original in post #81. The 6V6s are just 0.45A Ih each though.
  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 09:31 PM
preamp line ctt richwalters Tubes / Valves 1 7th March 2008 05:34 PM
Preamp for Line In and Mic blur Instruments and Amps 1 4th January 2007 05:02 PM
Line stage preamp, based on SY's "Heretical Unity gain line stage" Danko Tubes / Valves 23 18th July 2005 05:07 AM
Line preamp for 2A3 amp Petman Tubes / Valves 0 24th May 2002 04:11 PM


New To Site? Need Help?

All times are GMT. The time now is 06:50 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