Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Double parafeed
Double parafeed
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
Thread Tools Search this Thread
Old 25th October 2011, 08:17 PM   #1
MrCurwen is offline MrCurwen  Finland
diyAudio Member
Join Date: Feb 2010
Location: Helsinki
Default Double parafeed

I'm fooling around with some thought of parafeed, but alas I am a poor man, therefore I don't usually build a whole new amp unless I'm fairly certain it'll sound good. Or at least work at all.

I'm wondering would it be possible to have two (2) outputs from a parafeed power stage. To clarify: one tube, cathode biased (/w LEDs), choke on anode, two 4.7F Solen caps from anode of tube, one transformer between each cap and ground (or cathode).

The other transformer would be say 5K : 4R, to drive a bass cone speaker, the other a P-P transformer in reverse, 4R : 10K to drive an ESL tweeter.

Probably not the most elegant or otherwise best system, but if this would work it'd be very cheap!

Any thoughts?

Last edited by MrCurwen; 25th October 2011 at 08:20 PM.
  Reply With Quote
Old 25th October 2011, 08:49 PM   #2
Gluca is offline Gluca  Italy
diyAudio Member
Gluca's Avatar
Join Date: Nov 2004
Location: Back to Italy
No, the tube would see a very low impedance (4R from the ESL tweeter).
  Reply With Quote
Old 25th October 2011, 08:58 PM   #3
MrCurwen is offline MrCurwen  Finland
diyAudio Member
Join Date: Feb 2010
Location: Helsinki
The impedance reflected by a transformer depend on what is on the other side - the ESL panel is basically an open circuit, a capacitor. In reality it however has a very high impedance or so I've understood. Therefore it would reflect much more than 4R to the other side of the transformer.

Has it been done? Can you put a low impedance primary in a parafeed circuit with an ESL panel on the other side?
  Reply With Quote
Old 25th October 2011, 09:11 PM   #4
Frank Berry is offline Frank Berry  United States
diyAudio Member
Frank Berry's Avatar
Join Date: Sep 2003
Location: Midland, Michigan

Last edited by Frank Berry; 25th October 2011 at 09:15 PM.
  Reply With Quote


Double parafeedHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
to parafeed or not to parafeed that is the question nhuwar Tubes / Valves 63 28th February 2007 12:29 PM
Parafeed doubt croccodillo Tubes / Valves 6 9th August 2006 08:08 AM
Double rail PSU, double ground rail connexion ? youyoung21147 Chip Amps 5 6th November 2005 05:12 PM
6V6 Parafeed? G Tubes / Valves 13 8th June 2004 01:05 PM
Parafeed Brett Tubes / Valves 14 7th April 2003 12:53 PM

New To Site? Need Help?

All times are GMT. The time now is 05:49 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio