Output device for SE Hybrid Headphone Amp - diyAudio
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 11th January 2013, 05:28 PM   #1
diyAudio Member
 
weinstro's Avatar
 
Join Date: May 2003
Default Output device for SE Hybrid Headphone Amp

Hi,

I'm looking at two different headphone amps to build. One is Erno Borbely's hybrid headphone amp, and the other is Pete Millet's "Starving Student". Both are Class A, SE, and run on the same rail voltage. The former uses 2SK2013 output devices with feedback; the latter uses IRF510 without feedback.

- Is there likely to be a audible difference between these two output devices, which appear to be operated as source followers?

- Can I use the 2SK2013 in the "Starving Student"? I understand that the threshold voltages for the 2SK1013 (depending on the Vgs classification) is much lower than for the IRF510

- I may want to parallel 2 2SK2013's. Are there any estimates on the variance of Vgs vs. Idss for the 2SK2013? If I wanted to match pairs, I'd like to get a sense of how many devices I need to buy in order to get a reasonably close match, say <5% from the same lot.

Thanks and regards,

Rob
  Reply With Quote
Old 14th January 2013, 06:23 AM   #2
diyAudio Member
 
Marine Boat's Avatar
 
Join Date: Oct 2011
Why go single-ended and discrete? You end up with more distortion, more cost (this was the main good reason to go SE, when semiconductors cost more), and more work to do.

If you're really intent on using such outdated topologies I'd suggest the starving student. At least it uses feedback. Even on that one the output caps are way too small and I'd be a bit weary of trusting that point to point design -- something rattles around in the wrong way and you can say bye-bye to your best headphones. It looks like they payed no attention to grounding but since they use tubes I guess noise performance is a moot point.

Honestly you're better off using a BUF634 and an op amp all with global feedback, or even a plain high-current op amp. At least this will be rather predictable. That starving student design has a THD and frequency response that I'd expect from a cheap MP3 player, and god knows how that other one without any feedback measures.
  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
Hybrid tube headphone amp design ashok Headphone Systems 21 30th December 2012 05:17 PM
Insane Hybrid Headphone Amp (IHHA) BowtoEd Solid State 2 28th June 2012 06:19 AM
Headphone output for tubelab simple SE amp 2bz Tubelab 5 18th January 2011 03:18 AM
Portable Tube/Hybrid Headphone Amp petesjoy Headphone Systems 1 15th November 2009 12:57 PM
New Hybrid Output Stage and booster for SE Amp smoking-amp Tubes / Valves 3 20th March 2006 02:24 AM


New To Site? Need Help?

All times are GMT. The time now is 04:32 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