Crazy newbie tube driver question - 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 13th July 2008, 07:22 PM   #1
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
Default Crazy newbie tube driver question

OK all, I have seen a few driver circuits to a PP Output (long tailed phase inverter, Cathodyne phase inverter)...but as I was looking at a Audionote M7 circuit with (I believe it to be a parafeed??), I was wondering if this was an option or possible... to feed a 6L6GC PP output section with 6sn7... disregard the values for the time being, just overall

Please forgive me if the if the question is totally ridiculous...
Attached Images
File Type: jpg crazy.jpg (15.7 KB, 210 views)
__________________
All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian
  Reply With Quote
Old 13th July 2008, 07:50 PM   #2
diyAudio Member
 
jerluwoo's Avatar
 
Join Date: Feb 2006
Location: Ashland,Ky U.S
There will be no output for the cathode end because of the led bias. A led has very low on resistance, basically a short so no signal will appear across it. The led should be replaced with a resistor the same value as in the plate side. As for paralleling tubes, it should be fine as your are basically doubling drive current. Are you sure the circuit you saw is not a paraphase splitter instead?
  Reply With Quote
Old 13th July 2008, 08:07 PM   #3
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
OK. I can see that. So like this would be doable? Is there caveats to this type versus Cathodyne Phase splitter? Is bypass cap needed?
Attached Images
File Type: jpg crazy2.jpg (15.4 KB, 175 views)
__________________
All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian
  Reply With Quote
Old 13th July 2008, 09:06 PM   #4
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
The bypass cap will prevent this from working at all.

Before proceeding any further, I'd strongly recommend reviewing the section on phase splitters in Morgan Jones's "Valve Amplifiers." You can try all sorts of random things without really "getting" it, but if you understand the theory behind how a split load or long tail pair actually works, you're vastly more likely to come up with a successful scheme.
__________________
The more you pay for it, the less inclined you are to doubt it.- George Smiley
  Reply With Quote
Old 13th July 2008, 11:44 PM   #5
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally posted by john65b
OK. I can see that. So like this would be doable? Is there caveats to this type versus Cathodyne Phase splitter? Is bypass cap needed?

Sy's dead right on his comments, and what you have is a broken cathodyne phase inverter.. (The bypass cap amongst other things breaks it.)

I'd add Jones's "Building Valve Amplifiers" to the list of recommended reading in addition to Sy's suggestion of "Valve Amplifiers." I strongly recommend a cover to cover read of both titles for all newbies, and many veterans of the tube wars as well.

You do know that you need appreciable voltage gain ahead of the splitter to drive your output tubes?

Read first, ask questions next, build last...
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 14th July 2008, 01:07 AM   #6
diyAudio Member
 
Join Date: Jun 2004
Location: Indiana
See phase inverter sections here
__________________
If We The People refuse to hear the truth we will be ruled by liars.
  Reply With Quote
Old 14th July 2008, 02:42 AM   #7
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
I will do so. I appreciate your comments.

Thanks
__________________
All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian
  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
Newbie question: driver replacement senderj Multi-Way 14 18th April 2009 05:42 AM
newbie question : driver/output relationship, input sensitivity mahleriana Tubes / Valves 1 17th August 2008 08:10 PM
Newbie Question on Driver Ratings 6f6 Multi-Way 3 14th January 2007 11:58 PM
1st tube project - newbie tranny question lloop9 Tubes / Valves 8 24th February 2004 01:38 AM
Push Pull driver newbie question Diogo Solid State 9 10th August 2002 06:13 PM


New To Site? Need Help?

All times are GMT. The time now is 07:52 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