Mono push-pull driver PCB - Page 2 - 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 26th December 2011, 08:05 PM   #11
diyAudio Member
 
pmillett's Avatar
 
Join Date: May 2005
Location: Dallas (but I am not a Texan!)
Quote:
Originally Posted by bayermar View Post
Hi Pete,

do you think it would be possible to apply plate-to-plate (aka Schade) feedback with this driver board?
Yes, though I implemented it a little differently - I have positions for resistors from each driver plate to both B+ and to an off-board connection, which could be to the output plate, or to the unltralinear taps. So you can dial in the amount of feedback by adjusting the ratio of the two resistors.

You can also leave out the input tube and build this as a 2-stage amp. Maybe I will add some provisions to apply gNFB to the other side of the diff amp, as is done in the Baby Huey amp you reference...

Pete
  Reply With Quote
Old 26th December 2011, 08:07 PM   #12
diyAudio Member
 
pmillett's Avatar
 
Join Date: May 2005
Location: Dallas (but I am not a Texan!)
Quote:
Originally Posted by pso View Post
This little PCB are already for sale ?
Nope, not yet... it will be a few weeks.

Pete
  Reply With Quote
Old 27th December 2011, 10:12 AM   #13
diyAudio Member
 
bayermar's Avatar
 
Join Date: Oct 2007
Location: Tuebingen
Quote:
Originally Posted by pmillett View Post
Yes, though I implemented it a little differently - I have positions for resistors from each driver plate to both B+ and to an off-board connection, which could be to the output plate, or to the unltralinear taps. So you can dial in the amount of feedback by adjusting the ratio of the two resistors.

You can also leave out the input tube and build this as a 2-stage amp. Maybe I will add some provisions to apply gNFB to the other side of the diff amp, as is done in the Baby Huey amp you reference...

Pete
That sounds really nice!!!
So, when you say universal, you really DO mean universal.
Sounds like a lot of thoughts went into this board.
I appreciate that.

Thanks!
Martin
  Reply With Quote
Old 27th December 2011, 04:52 PM   #14
diyAudio Member
 
pmillett's Avatar
 
Join Date: May 2005
Location: Dallas (but I am not a Texan!)
OK, I made a few more tweaks, and wrote up a full circuit description on the web site. Please have a look, let me know of any errors you see, or any other requests...

Push-pull driver board

Thanks,
Pete
  Reply With Quote
Old 18th January 2012, 06:18 PM   #15
kegger is offline kegger  United States
diyAudio Member
 
Join Date: May 2004
Location: michigan
I've looked over the latest Pete,
(quite nice additions there)

You've certainly gotten my interest.
(should make a great test platform)
  Reply With Quote
Old 19th January 2012, 01:45 AM   #16
diyAudio Member
 
smoking-amp's Avatar
 
Join Date: Dec 2001
Location: Hickory, NC
"or any other requests..."

Would be nice to have some resistor positions, with cathode fdbk nodes, in the two cathodes of the 12GN7 drivers. (Like in the RCA tube handbook for their 50 Watt amplifier). But that likely won't work out with the current self splitting of the driver stage. Could maybe leave room for a small (optional) HV Mosfet Concertina splitter stage in front of the drivers to operate the two driver grids then.
__________________
I want a Huvr-Board!!
  Reply With Quote
Old 19th January 2012, 12:34 PM   #17
diyAudio Member
 
pmillett's Avatar
 
Join Date: May 2005
Location: Dallas (but I am not a Texan!)
Quote:
Originally Posted by smoking-amp View Post
"or any other requests..."
Ah, a little too late... PCBs are on their way to me now...

I'm in Asia at the moment, but will post more info when I get home this weekend.

Pete
  Reply With Quote
Old 20th January 2012, 03:00 AM   #18
roline is offline roline  United States
diyAudio Member
 
roline's Avatar
 
Join Date: Sep 2010
Location: East Tennessee
Watch out for the frog in hot chili oil, The frog is OK a little crunchy, its the chili oil that gets you the next day.... I had a stint in Langfang last yr, quite an experience, no time to chase audio parts.
I like the PCB, 6L6 or 6LB6 family should work great with it. Bias for the screens of the 6LB6's?? It could be done off board zener stack on power supply. Lots of feedback and bias options...I especially like the CCS on the second stage and Schade feedback from the output tubes. I appreciate that your work will open up the realm of tube amps to nubies eager to try their hand at it. I wish that this was available a couple yrs ago when I decided to try the enlightened path of tube amps, it is a great step up to what was available then, looks like a great breadboard to learn from. A far nicer PCB than the toner transfers that I've been making..
__________________
SO many tubes, SO little time!!!

Last edited by roline; 20th January 2012 at 03:05 AM.
  Reply With Quote
Old 3rd February 2012, 08:19 PM   #19
wicked1 is offline wicked1  United States
diyAudio Member
 
wicked1's Avatar
 
Join Date: Jan 2008
Location: Midwest
How's the progress on these PCB's?
  Reply With Quote
Old 3rd February 2012, 08:25 PM   #20
diyAudio Member
 
pmillett's Avatar
 
Join Date: May 2005
Location: Dallas (but I am not a Texan!)
Quote:
Originally Posted by wicked1 View Post
How's the progress on these PCB's?
I have the new rev boards (red, or course) in house now... I've been traveling again (just got back) so I have not found time to document it on the web site.

I will try and get at least some info and pictures on the website and get them on eBay this weekend... it might take a little longer for me to actually build up a pair for myself.

Pete
  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
idiot proof mono push pull 6l6gc schematic wanted jasondace2b Tubes / Valves 29 13th October 2011 01:22 AM
Mono 5W-17W Power Amp using EL84 push-pull nbraz Tubes / Valves 30 27th July 2011 11:12 PM
Please Explain difference Mono vs Push Pull vs Single End etc hdlcx2 Tubes / Valves 11 3rd August 2008 02:27 AM
Push-Pull driver stage? alexmoose Tubes / Valves 12 18th September 2006 11:38 PM


New To Site? Need Help?

All times are GMT. The time now is 07:54 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