Tubes: parafeed vs singlefeed - 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 18th February 2012, 11:24 AM   #1
regal is offline regal  United States
diyAudio Member
 
Join Date: Jan 2004
Location: MD
Default Tubes: parafeed vs singlefeed

I had a transformer winder tell me something that made me think.

He prefers singlefeed opt's for headphones.

He said with single feed you only have 2 reactive devices - the OPT and the voice-coil. While with parafeed you are adding 2 (the choke load and the big parafeed cap) for a total of 4, which in his opinion is bad.

I guess I used to think way this as well, its a good point he reminded me of.

But with depletion mode n-channel mosfets for a CCS load and the relatively nice low cost various large size russian caps available today, the potential to run a transformer with higher inductance for a smaller core size.

I mean the CCS is good for linearity but the load is in parallel with the OPT, so if you start with a high quality shunt B+ are we really gaining anything with the CCS? PSRR that we don't need, and the load is dominated by the cap and transformer.

On the other hand I believe that the high secondary DCR that single feed headphone OPT's bring to the table is a negative. I think more than just damping but also detail loss.

I am really on the fence with this one, do I convert my existing amp to parafeed or just build a seprate parafeed version. (the prefiltered B+ is in a separate enlosure.)


Any opinions on this, or interested in the topic ?
  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
Double parafeed MrCurwen Tubes / Valves 3 25th October 2011 09:11 PM
to parafeed or not to parafeed that is the question nhuwar Tubes / Valves 63 28th February 2007 12:29 PM
Parafeed output croccodillo Tubes / Valves 0 17th January 2007 02:51 PM
Parafeed doubt croccodillo Tubes / Valves 6 9th August 2006 08:08 AM
Parafeed Brett Tubes / Valves 14 7th April 2003 12:53 PM


New To Site? Need Help?

All times are GMT. The time now is 05:58 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