DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently March 28th, 2024, 9:45 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 33 posts ]  Go to page Previous  1, 2, 3, 4
Author Message
 Post subject: Re: New PP amp...
PostPosted: November 17th, 2014, 4:57 pm 
Offline

Joined: July 24th, 2013, 11:11 am
Posts: 21
Ok. That's where I was confused. :)

Thanks
Scott


Top
 Profile  
 
 Post subject: Re: New PP amp...
PostPosted: November 17th, 2014, 6:49 pm 
Offline

Joined: April 22nd, 2013, 12:58 pm
Posts: 285
I think I know what Jetbat is referencing.....
Some people call this a Cathode Coupled circuit. They claim that the cathode of V1a is "driving" the cathode of V1b, which then makes the behavior of V1b look a lot like a grounded grid stage (AKA Common Grid). Not saying this is right....... :roll:


Roscoe Primrose wrote:
Jetbat wrote:
Isn't V1B a common grid stage? Or does that change with the grid tied to the R8-R9 junction?

Scott


No, it's a standard common cathode stage. Input is the grid, output from the plate. The connection of R2 to the junction of R4 & R7 just provides a DC feedback to keep the bias current in the output tubes more stable (as does the R1/R3/R6 combo).

Roscoe


Top
 Profile  
 
 Post subject: Re: New PP amp...
PostPosted: November 17th, 2014, 7:01 pm 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1682
FerdinandII wrote:
I think I know what Jetbat is referencing.....
Some people call this a Cathode Coupled circuit. They claim that the cathode of Via id "driving" the cathode of V1b, which then makes the behavior of V1b look a lot like a grounded grid stage (AKA Common Grid). Not saying this is right....... :roll:


I think 'cathode coupled' would refer to a phase splitter that has a shared, unbypassed, cathode resistor for both V1A & V1B, with the grid of V1B (at least AC) grounded. Also know as a Long Tailed phase inverter. That's NOT what's happening here at all...

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 33 posts ]  Go to page Previous  1, 2, 3, 4

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: Google [Bot] and 42 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group