Compactron amp... LIVES! - 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 20th November 2010, 05:00 AM   #1
roline is offline roline  United States
diyAudio Member
 
roline's Avatar
 
Join Date: Sep 2010
Location: East Tennessee
Default Compactron amp... LIVES!

Just finished stuffing the board and applied power without speaker global feedback. The Monster lives, but with the global output feed back, less gain and is much better behaved, more refined sound quality.
6U10 for input and LTP driving 6JN6 (or 6JM6 with plate cap) output tubes running in triode mode. Pots for balancing and adjusting output current worked, running 40ma Iq with less than .001 volt mismatch across the 10ohm resisters.
This is my first tube amp project, PCB was a challenge with the ironed toner resist method, used same method for front component identification..
eyelets for all through holes for wiring and back mounted caps.
Next, try different output transformers, refinement and put into a box.

Next project selected is a KT88 design driven by 6N6H Russian tubes LTP and 6SN7 front end to allow for tube / tone character selection.
SO many tubes, SO little time....
Attached Images
File Type: jpg amp1a.jpg (168.3 KB, 1649 views)
File Type: jpg amp2.jpg (135.3 KB, 1591 views)
  Reply With Quote
Old 20th November 2010, 05:50 AM   #2
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Congratulations!

Very nice, real DIY amp!
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 20th November 2010, 05:55 AM   #3
diyAudio Member
 
Join Date: Feb 2004
Location: Elst
Default Congratulations !

Good morning Roline,

congratulations with the Compactron-amp.
For my last amplifier i used Compactrons as well. First a 6HV5 for the combined task as input/driver for the 35TG. It worked....but did not sound nice. Then i switched to the dual-different-triode-family (6FY7, 6FJ7, 6FM7) with great results. The first triode inside the Compactron as input; the second as driver.

As you said: so many tubes; so little time. And the variety of Compactrons is amazing; the price as well.....

Lots of luck with the building. Enjoy your creation.
Regards, Reinout
Attached Images
File Type: jpg IMG_8077.JPG (100.0 KB, 1561 views)
  Reply With Quote
Old 20th November 2010, 07:05 AM   #4
diyAudio Member
 
vinylkid58's Avatar
 
Join Date: May 2005
Location: Victoria, B.C.
That's a super cool amp, congrats. Very compact board layout for a PP amp.

jeff
  Reply With Quote
Old 20th November 2010, 07:16 AM   #5
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Looks cool, but substations that have such voltages have shields and scary pictures... It is more dangerous than electric chair, because it looks cool, and don't resemble a killing machine! I mean Reinout's picture.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 20th November 2010, 06:32 PM   #6
piano3 is offline piano3  United Kingdom
diyAudio Member
 
Join Date: Aug 2010
Location: London,UK
Just looking at Reinout's(beautifully made) amp scares me!
  Reply With Quote
Old 20th November 2010, 07:11 PM   #7
roline is offline roline  United States
diyAudio Member
 
roline's Avatar
 
Join Date: Sep 2010
Location: East Tennessee
I have a design that uses 7193 and 615 mickey mouse tubes, all with top cap connections.... to drive the outputs. There are several output tubes also with the plate cap....
Something to keep the finders out of. I was under the impression that it was done for capacatance reduction for a higher power band width..
  Reply With Quote
Old 20th November 2010, 09:03 PM   #8
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Nice as those all metal plate caps look, I'm far more comfortable with ceramic ones or an enclosure.

That PCB look just awesome, obviously a lot of care and trouble went into its design and fabrication..
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 21st November 2010, 03:02 AM   #9
diyAudio Member
 
rsumperl's Avatar
 
Join Date: Oct 2009
Location: Warren Center, PA
Hi,
Great job! Can you post a schematic?

Thanks,
Ray
  Reply With Quote
Old 21st November 2010, 10:11 PM   #10
roline is offline roline  United States
diyAudio Member
 
roline's Avatar
 
Join Date: Sep 2010
Location: East Tennessee
Default True Compactron Amp

Latest Schematic....
Attached Images
File Type: jpg COMP-AMP-B.jpg (183.3 KB, 1330 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
Another compactron PP output engels Tubes / Valves 15 22nd September 2011 04:03 AM
Compactron Output Tubes audiowize Tubes / Valves 10 18th June 2008 02:38 AM
When is a compactron not a compactron? ray_moth Tubes / Valves 4 28th December 2007 12:31 PM
Zen Headphone Amp Lives (Sort of!) metalman Headphone Systems 45 26th April 2004 11:25 PM


New To Site? Need Help?

All times are GMT. The time now is 03:39 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