Photo Gallery - Page 432 - 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 4th September 2012, 02:50 PM   #4311
diyAudio Member
 
mhouston's Avatar
 
Join Date: Feb 2006
Location: Victoria, Australia
Quote:
Originally Posted by soundbrigade View Post
I have made a stereoamp with two tubes, one is a 12AT7 and the second a 5998A. Dual powertubes are great, or at least can make interesting projects. I am fiddling with one 832 but have cast glances on some obsolete Russian 6R3S from my Priboj. Each tetrod in the tube is rated 20W.
I usually see you on diyaudioprojects. Do you have an image of the tubes?
  Reply With Quote
Old 4th September 2012, 03:42 PM   #4312
diyAudio Member
 
soundbrigade's Avatar
 
Join Date: Feb 2006
Location: Vaenersborg, Sweden
Send a message via MSN to soundbrigade
OK, here's the 5998A:

Click the image to open in full size.

Not finished but this will be my 5998A PSE:

Click the image to open in full size.

The Russian dual powertetrode looks like this. Socket is the GU-50 type socket:

Click the image to open in full size.
__________________
/Magnus
  Reply With Quote
Old 4th September 2012, 04:20 PM   #4313
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
Is there sufficient gain with one 12AT7 combined with low mu 5998A?

Your Priboi pcb looks more than typical with burned resistors and circuit board .

One douple tetrode that I like is GMI-6. It gives 20 W with very low distortion in pp-mode.
  Reply With Quote
Old 4th September 2012, 05:20 PM   #4314
diyAudio Member
 
soundbrigade's Avatar
 
Join Date: Feb 2006
Location: Vaenersborg, Sweden
Send a message via MSN to soundbrigade
5998A is very much like 6AS7G, but has higher gain, but the 12AT7 handles the tube most perfectly.

I had the Priboi rebuilt but will some day rebuild it again and throw in, either a bunch of GU-50, or 6P36S (EL500) or maybe just some 6L6.
__________________
/Magnus
  Reply With Quote
Old 4th September 2012, 08:59 PM   #4315
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
If you change the output tubes to GU-50, then take the supply voltage for the phase splitter/amplifier tube (6N6P) from 420 V line. With original supply voltage the swing of the phase splitter is far too low for GU-50.
One of my friend just modified one a couple weeks ago.
  Reply With Quote
Old 5th September 2012, 11:45 AM   #4316
diyAudio Member
 
soundbrigade's Avatar
 
Join Date: Feb 2006
Location: Vaenersborg, Sweden
Send a message via MSN to soundbrigade
I used this schematic for the modification:
http://www.pastisch.se/tubes/images/Priboj_sch.jpg.
Have to re-wire the power tranny.
__________________
/Magnus
  Reply With Quote
Old 7th September 2012, 11:41 PM   #4317
diyAudio Member
 
vitalstates's Avatar
 
Join Date: Jan 2006
Location: uk
finally got this off the breadboard and into a box..after nearly 5 years...

Vitalstates- Amplifiers
Attached Images
File Type: jpg sv572.jpg (126.5 KB, 980 views)
__________________
There is nowhere you can be that isn't where you're meant to be
www.vitalstates.org
  Reply With Quote
Old 8th September 2012, 12:46 AM   #4318
diyAudio Member
 
mhouston's Avatar
 
Join Date: Feb 2006
Location: Victoria, Australia
vitalstates: really very nice. To go to the effort of painting the Hammonds is a fine touch and looks like an excellent heavy paint job on chassis etc.
  Reply With Quote
Old 8th September 2012, 06:33 AM   #4319
diyAudio Member
 
richwalters's Avatar
 
Join Date: Sep 2003
Location: Alps:Tube amp designs over 150W, SMPS guru.
Quote:
Originally Posted by vitalstates View Post
finally got this off the breadboard and into a box..after nearly 5 years...

Vitalstates- Amplifiers

........and underneath looks ?
  Reply With Quote
Old 8th September 2012, 06:57 AM   #4320
diyAudio Member
 
vinylkid58's Avatar
 
Join Date: May 2005
Location: Victoria, B.C.
Quote:
Originally Posted by soundbrigade View Post
OK, here's the 5998A:

Click the image to open in full size.
S&M Rubber Duckie looks like he's in love.

jeff
  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



New To Site? Need Help?

All times are GMT. The time now is 08:06 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