Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 27th June 2009, 05:54 AM   #1
Bitrex is offline Bitrex  United States
diyAudio Member
 
Join Date: Jan 2009
Default An idea for a 6N7 headphone amp

I have a bunch of Soviet made 6H7Cs (sort of like 6N7 but with beefy ratings FOR THE GLORY OF THE PEOPLE) - I was thinking about making a relatively inexpensive headphone amplifier with 4 of them. I'm not sure what a schematic drawing program that is good for tubes is (recommendations?) but I'll describe it for now. Each channel: 1 6N7 connected as a differential amplifier, constant current source long tail consisting of a compensated Wilson current mirror with some kind of current source feeding the mirror, directly coupled to an output 6N7 cathode follower - both sections paralleled up to raise the transconductance and drop the plate resistance, and feed that with the cascaded LM317 current source I was reading about the other day. Take a little feedback from the output back to the inverting input of the differential amp, and that's about it.

I have a some 6X5 rectifiers that can supply up to 75ma which seems like it would be enough for this amplifier. With the constant current sources the PSRR should be pretty good, so I'm thinking I can get away with just having a standard CLCRC filter. The 6H7Cs draw about 0.8 amps each though, so I might use a separate filament supply for them and bias it up through the center tap so I can do the direct-coupling thing. Use the main power transformer filament winding to feed the rectifier and power the current sources in the differential amplifier with a solid state voltage doubler. Total tubes used: 4 6H7Cs and 1 6X5.

Any feedback would be appreciated! I've never done a circuit with feedback into a tube differential pair before, so any advice on that would be appreciated. What kind of currents might be good to have running through the input and output constant current sources?
  Reply With Quote
Old 27th June 2009, 07:11 AM   #2
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
If I remember right, 6N7S were used with positive biased grids, hence with grid currents. It may be the right step in the middle between transistors and tubes.

As a native Russian speaker, I've found for you this page:

Click the image to open in full size.
__________________
If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.
  Reply With Quote
Old 5th July 2009, 07:31 PM   #3
Yurik_V is offline Yurik_V  Belarus
diyAudio Member
 
Join Date: Mar 2006
Location: Brest
6N7 headphone amp by Sergeev
Attached Images
File Type: gif 6n7s.gif (2.5 KB, 334 views)
  Reply With Quote
Old 5th July 2009, 11:09 PM   #4
diyAudio Member
 
sorenj07's Avatar
 
Join Date: May 2006
It would be nice to see the impedance ratio of that OPT..
  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
TSHA.. A very simple Headphone Amp idea.. Dxvideo Headphone Systems 15 1st February 2009 07:04 PM
Idea for an ECL82 PP headphone amp. Shoog Headphone Systems 19 14th May 2007 07:34 AM
Hypex headphone idea khundude2012 Headphone Systems 1 13th September 2006 09:50 PM
Headphone amp idea.... robselina Headphone Systems 23 27th May 2005 06:43 PM
OTL 6L6 headphone amp-idea+need help trespasser_guy Headphone Systems 16 25th March 2003 01:26 PM


New To Site? Need Help?

All times are GMT. The time now is 08:17 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