6V6 line preamp - Page 3 - 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 30th May 2007, 11:18 AM   #21
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Further auditions.

The 6V6 pre enthused in the system of the fellow DIYer. The 'hssst' transients never appeared again. Due to less efficient speakers than mine, 'ding' sounding microphonics when the envelope is striken, are even less. Not more than his 6SN7 pre he said. Its moving to another housing with 5R4GY 300V supply passively filtered with chokes, and a warmer operating point. Testing continues. Will let you know.
  Reply With Quote
Old 3rd June 2007, 10:22 PM   #22
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Current version even better

The preamp right now follows the attached schematic. It works even cleaner with even more impact and warmth. The early desired and now realized operating point is indeed the best. Current is 22mA, cathode stays at 15V give or take. Gain is around 7 times.
The NOS prewar 6V6Gs are wonderful sounding. Their microphonics are good enough for practical use, but we are looking for NOS GT variables and square plated old and new to determine the best in both departments and broaden our choice in sonic flavor. A good contestant for building this line pre with new and available is JJ 6V6S with strong square and ribbed plates as long as the new Russian Tungsol with oval ones. Both have good reports for tone and microphonicity. We intend to check em out. Remember that you cant go wrong with any 6V6 make in triode mode, its a sweet little gal, the Evangeline Lilly of tubes. Build this pre and you cant get LOST. Highly recommended. It beats the OTHERS.
Attached Images
File Type: jpg 6v6linepresm.jpg (68.8 KB, 5617 views)
  Reply With Quote
Old 30th June 2007, 03:02 PM   #23
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default 6V6GT tests

Good news! 6V6GT Miniwatt and Sylvania showed no peculiar self noises at all! They sound a treat too. We had a good comparison yesterday with properly executed 6SN7 (cascade) and 6V6GT (as above). Also a 12AU7 (cascade) one. The 6V6 idea reigns in musicality and richness. Confirmed by Bob too.
Attached Images
File Type: jpg bob.jpg (93.5 KB, 4811 views)
  Reply With Quote
Old 30th June 2007, 03:03 PM   #24
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default 6V6GT Sylvania

Pictured with Sylvania.
Attached Images
File Type: jpg 6v6sylvania.jpg (76.3 KB, 4594 views)
  Reply With Quote
Old 30th June 2007, 03:08 PM   #25
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default 6V6GT Philips Miniwatt

Pictured with Miniwatt. The most organic sounding one. The Sylvania had more presence effect but rather artificially so. Remember that no triode 6V6 can sound bad. Only flavor changes.
Attached Images
File Type: jpg 6v6miniwatt.jpg (98.0 KB, 4544 views)
  Reply With Quote
Old 30th June 2007, 03:12 PM   #26
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Sad & Lonely 6SN7

The 6SN7 sitting lonely on hundreds of vinyl records listening to 6V6GT performing...
Attached Images
File Type: jpg 6sn7cascade.jpg (94.7 KB, 3532 views)
  Reply With Quote
Old 30th June 2007, 03:20 PM   #27
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Good Vibe Sentinel

Parthenon was overlooking us facing the balcony, had to be sure we keep a measure of balance in our DIY.
Attached Images
File Type: jpg parth.jpg (98.4 KB, 2475 views)
  Reply With Quote
Old 30th June 2007, 03:54 PM   #28
diyAudio Member
 
Brian Beck's Avatar
 
Join Date: Dec 2004
Location: South Florida, USA
Wow, you've got THAT outside your window? I hope that you're using Cardas Golden Ratio cables then. You don't want to make the gods angry.
__________________
Brian
  Reply With Quote
Old 30th June 2007, 04:05 PM   #29
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Its right across my good friend's balcony where the yesterday tests took place. Sadly I did not have a tripod with me to engage a night mode long exposure.

*Parthenon has yet another trick up its sleeve. No right angle nowhere. Its quasi right. So it looks right from underneath.
  Reply With Quote
Old 22nd July 2007, 07:52 PM   #30
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Another One

Modified mine too. He, he, now it carries the bombs! With current sourced heaters, yes Sir! Sounds mega.
Attached Images
File Type: jpg 6v6g-pre.jpg (85.0 KB, 2676 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 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 10:59 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