The all DHT SET Headphone Amp - Page 9 - 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 31st January 2013, 07:01 PM   #81
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by ikoflexer View Post
You can't get rid of the cap across the 4k3 resistor if you want the tube to properly amplify the signal. If you want to get rid of that cap you need a stacked supply. Then the 4k3 resistor also disappears. Which also makes the filament bias useless. So, if you want DC coupling then you either to the resistor plus cap, and the filament bias is useless IMHO, or you have a stacked supply, and the filament bias again brings nothing to the table.

Myself, not sure how much of a fan of DC coupling I am... is the effort and complications worth it?
It is exactly how I powered my last version of headphone amp, before the project had been postponed. Except the bottom PS was actually a shunt regulator, in series with upper 2 power supplies.

Click the image to open in full size.
Click the image to open in full size.
__________________
The Devil is not so terrible as his math model is!

Last edited by Wavebourn; 31st January 2013 at 07:03 PM.
  Reply With Quote
Old 31st January 2013, 07:03 PM   #82
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
I agree with Anatoliy, I would definitely do that for the bottom supply, make it a really good shunt regulator, to have outstanding low output impedance.
  Reply With Quote
Old 31st January 2013, 07:15 PM   #83
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Quote:
Originally Posted by Wavebourn View Post
It is exactly how I powered my last version of headphone amp, before the project had been postponed. Except the bottom PS was actually a shunt regulator, in series with upper 2 power supplies.
Nicely folded aluplates there Anatoliy. I too is allergic to stupid smallish signal tubes sticking up for no reason and prevent decent stacking.

Nice looking toobs to be shown, the rest can rest.

Staffan

Last edited by stajo; 31st January 2013 at 07:22 PM.
  Reply With Quote
Old 31st January 2013, 07:24 PM   #84
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by stajo View Post
Nicely folded aluplates there Anatoliy. I too is allergic to stupid smallish signal tubes sticking up for no reason and prevent decent stacking.

Nice looking toobs to be shown, the rest can rest.
Thank you Stafan.

When I show tubes I always protect them somehow, like transformer box behind, cheeks on sides. Like here, for example:


Click the image to open in full size.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 31st January 2013, 07:49 PM   #85
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Quote:
Originally Posted by Wavebourn View Post
Thank you Stafan.

When I show tubes I always protect them somehow, like transformer box behind, cheeks on sides. Like here, for example:
Well GU50s I would show, if not for the spectacular "pull-out-and-replace-hotties" arrangement. I beleave those were designed for cannons, werent they?

/S
  Reply With Quote
Old 31st January 2013, 08:29 PM   #86
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Sorry for OT. I follow the thread. My half nickel is that I am most curious about designs that meets designgoals, not just show excellent figures in relation to nothing (1 Mohm resistor so). Preamps, especially anodefollowers, for example. Most data is useless unless you know what you load it with.

Keep up, interesting thread!
Staffan
  Reply With Quote
Old 31st January 2013, 08:57 PM   #87
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
I think the people currently active in the thread are keen on building a good headphone amp, regardless of design goals. There's a good chance we lack any real engineers though.
  Reply With Quote
Old 31st January 2013, 09:20 PM   #88
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Quote:
Originally Posted by ikoflexer View Post
I think the people currently active in the thread are keen on building a good headphone amp, regardless of design goals. There's a good chance we lack any real engineers though.
Just for the interest. How can you build something that is good if you dont know what good is and what its for?

/Staffan
  Reply With Quote
Old 31st January 2013, 09:29 PM   #89
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by stajo View Post
Well GU50s I would show, if not for the spectacular "pull-out-and-replace-hotties" arrangement. I beleave those were designed for cannons, werent they?
For military radio amplifiers. Originally were designed by Telefunken for their army and police.

http://tubedata.milbert.com/sheets/043/l/LS50.pdf
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 31st January 2013, 09:36 PM   #90
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
first time I'm here, and sorry to say, but I'm already totally confused
  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
High end Ortho Amp on a basic Russian Tube DHT SET DIY design regal Headphone Systems 2 7th December 2012 12:46 PM
300b all-DHT SET andyjevans Tubes / Valves 16 24th August 2012 09:06 PM
Help on designing full DHT SET power amplifier milen007 Tubes / Valves 56 11th August 2011 10:38 PM
Class A, DHT driven, headphone amp iko Headphone Systems 100 26th March 2011 03:54 PM


New To Site? Need Help?

All times are GMT. The time now is 01:56 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