Summing at the LTPI - 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 11th January 2008, 02:52 PM   #1
diyAudio Member
 
Join Date: Aug 2005
Default summing at the LTPI

Does anyone have some experience using a Long Tail Phase Inverter as a summing amp (passive summing at the 1st input)? What were the results? Any thing to watch for in such a design?

peace,
memphissound <><
  Reply With Quote
Old 11th January 2008, 03:54 PM   #2
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
I used to build all of my bigger (>60W) PP amplifiers using global feedback fed to the inverting input of an LTP input stage.. Worked just fine.

Designed a 0 global feedback PP 300B amplifier that was published in VTV with an LTP as input stage with a balanced input option. Built a similar stereo 300B PP amplifier commercially, no global feedback with an LTP input normally configured for a single ended input, a balanced option was available, but no one requested it.

All worked just fine.

The VTV article is available on my site.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 11th January 2008, 04:36 PM   #3
diyAudio Member
 
Join Date: Aug 2005
Default thanks

That's about what I'm looking for. PP power amp in the 40-60W range (instrument app.). After posting here I thought about the old Fender stand alone reverb unit which basically does what I'm interested in. Thanks much.

peace,
memphissound <><
  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
DIY summing ? jayjaybee Analogue Source 16 25th July 2010 08:27 AM
Summing Op-Amp circuit FastEddy Subwoofers 42 24th April 2007 11:19 PM
6sc7 vs. 6su7 in LTPI duty aletheian Tubes / Valves 3 25th November 2006 01:17 AM
Summing inputs... chipco3434 Chip Amps 3 1st June 2004 04:23 PM


New To Site? Need Help?

All times are GMT. The time now is 07:31 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