SRPP Paraccordion topology ? - 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 12th May 2012, 12:33 PM   #1
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Blog Entries: 2
Default SRPP Paraccordion topology ?

I was thinking about the Rush Cascode again (nightmares about SS ) and the benefit of it keeping same current flow through top and bottom device when I thought maybe this could be used to achieve good current balance in a PP type output ?

Attached: uses OPT with two separate primaries - wired so that dc currents cancel. Allows easy use of toroidal OPT.


p.s. the resistor was an after thought about reducing the Q of any L-C resonances.
Attached Images
File Type: jpg SRPP Acordian.jpg (44.1 KB, 191 views)
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 13th May 2012, 03:08 AM   #2
diyAudio Member
 
Join Date: Jun 2011
the trick would be in the setup of bias and balanced ac signal gain as the bottom triode ground (in ac) has to be in balanced with the top triode's ground (in ac) (across the cathode to tap of the transformer). A screen grid resistor might have to be selected on the top triode to get the signal across primaries symmetric.

the caps + resistor would effectively take any common mode noise from the power supply and inject it at the null point the resistor value would have to be selected ( or even adjustable) after the ratio of top cap value to bottom cap value has been selected.
  Reply With Quote
Old 13th May 2012, 02:23 PM   #3
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
"Screen grid resistor" - for a triode??
  Reply With Quote
Old 13th May 2012, 05:35 PM   #4
diyAudio Member
 
Join Date: Jun 2011
sorry let me clarify and use the correct term: "grid stop resistor".
  Reply With Quote
Old 13th May 2012, 05:45 PM   #5
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
A grid stopper prevents parasitic HF oscillation. It should play no part in normal audio circuit operation (except perhaps in some guitar amps where oversized grid stoppers provide early HF rolloff).
  Reply With Quote
Old 13th May 2012, 05:56 PM   #6
diyAudio Member
 
Join Date: Jun 2011
its the signal attenuation properties the grid stop would be used and it would be a small resistance value (below 10K) to trim for best operation.
  Reply With Quote
Old 13th May 2012, 06:25 PM   #7
diyAudio Member
 
Chris Hornbeck's Avatar
 
Join Date: May 2011
Location: Little Rock
Quote:
Originally Posted by DavesNotHere View Post
its the signal attenuation properties the grid stop would be used and it would be a small resistance value (below 10K) to trim for best operation.
You really want to rethink this, methinks.

All good fortune,
Chris
  Reply With Quote
Old 13th May 2012, 06:57 PM   #8
diyAudio Member
 
Join Date: May 2007
Concentrate on the circuit itself, guys. Why discuss grid stoppers in a circuit that will never work! The idea with two series connected opposite phase coils is nice and was patented already in the 40s. I once did a parafeed SE called Vetor. Its a thread in this forum about it.

Click the image to open in full size.

Last edited by revintage; 13th May 2012 at 07:00 PM.
  Reply With Quote
Old 14th May 2012, 01:57 AM   #9
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Blog Entries: 2
Interesting choice of load - you used C5 instead of my caps-to-the-rails.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 14th May 2012, 07:30 AM   #10
diyAudio Member
 
Join Date: May 2007
To make it easier to understand you can play with this one.
Attached Files
File Type: asc bigacc.asc (5.1 KB, 14 views)
  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
Looks like SRPP ? Bigun Solid State 3 31st May 2010 11:25 PM
To SRPP or not? duderduderini Tubes / Valves 2 12th March 2007 04:01 PM
srpp 6c33c adharvey Tubes / Valves 3 29th January 2006 03:46 AM
SRPP Help Needed Markedward Tubes / Valves 12 27th April 2004 06:31 AM
SRPP is....? peranders Tubes / Valves 8 19th December 2003 09:38 PM


New To Site? Need Help?

All times are GMT. The time now is 06:17 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