Mystery (to me) phase inverter?

porkchop61 · 30th September 2004, 05:59 PM

Hi all-
Can someone possibly tell me what type of phase inverter this is? I've looked at all the types, long tailed pair, cathodyne, etc. but nothing looks similar.

This is on a PA amp that I'm converting to a guitar amp, so I'm planning on changing to a long tailed pair shortly.
I'd really like to know what this is though for my own education.

Any help would be appreciated.
Thanks!
Glenn

SY · 30th September 2004, 07:37 PM

What you got there is a plain-vanilla split-load or concertina. Advantages are simplicty and the reliance on passive component tolerances to set balance. Disadvantages include strict requirements for load symmetry and less-than-unity gain, which transfers gain swing issues to the input stage.

porkchop61 · 30th September 2004, 07:56 PM

Thanks for the information Sy.
Looks like I'll be going for the long tail pair PI sooner than expected.
Glenn

Sch3mat1c · 30th September 2004, 10:07 PM

Quote:

Originally posted by porkchop61
Can someone possibly tell me what type of phase inverter this is?

Quote:

Originally posted by porkchop61

cathodyne

Enzo · 1st October 2004, 07:52 AM

This method is simple and it works. SInce you already have the amp and are converting it, why not leave it as it is and see what it sounds like, then convert it to another style later for comparison. Or if you like it, leave it.

Geek · 1st October 2004, 11:44 AM

Paraphase inverters are less suceptible to load variations. Here is some education on those

http://dogstar.dantimax.dk/tubestuf/paraph.htm

Sch3mat1c · 1st October 2004, 05:38 PM

The other bad thing about cathodyne is it isn't good for much voltage, so you need an amplifier to drive stubborn tubes (like high voltage 6L6s needing 60V or more drive). This produces the Williamson driver circuit, but it has a lot of coupling caps so I don't like it. An LTP is a good way to get final drive requirements. I haven't done anything with paraphase but it seems like it has similar properties.

How 'bout that 6X8 paraphase?

Tim

Geek · 2nd October 2004, 08:01 AM

Quote:

Originally posted by Sch3mat1c
How 'bout that 6X8 paraphase?

That one is just brilliant

Fred had sent me a pile of them to me last fall.

planet10 · 2nd October 2004, 08:24 AM

Quote:

Originally posted by Geek
Fred had sent me a pile of them to me last fall.

I think i have a pile of those too...

dave

Sch3mat1c · 2nd October 2004, 03:51 PM

I only have two I think, but they're so hard to use, it might as well be a pile!!

Tim

30th September 2004, 07:37 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	What you got there is a plain-vanilla split-load or concertina. Advantages are simplicty and the reliance on passive component tolerances to set balance. Disadvantages include strict requirements for load symmetry and less-than-unity gain, which transfers gain swing issues to the input stage. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

1st October 2004, 05:38 PM	#7
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	The other bad thing about cathodyne is it isn't good for much voltage, so you need an amplifier to drive stubborn tubes (like high voltage 6L6s needing 60V or more drive). This produces the Williamson driver circuit, but it has a lot of coupling caps so I don't like it. An LTP is a good way to get final drive requirements. I haven't done anything with paraphase but it seems like it has similar properties. How 'bout that 6X8 paraphase? Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

2nd October 2004, 03:51 PM	#10
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	I only have two I think, but they're so hard to use, it might as well be a pile!! Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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30th September 2004, 07:56 PM	#3
porkchop61 diyAudio Member Join Date: Aug 2004 Location: Mansfield, Connecticut	Thanks for the information Sy. Looks like I'll be going for the long tail pair PI sooner than expected. Glenn

1st October 2004, 07:52 AM	#5
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	This method is simple and it works. SInce you already have the amp and are converting it, why not leave it as it is and see what it sounds like, then convert it to another style later for comparison. Or if you like it, leave it.

1st October 2004, 11:44 AM	#6
Geek diyAudio Member Join Date: Sep 2004	Paraphase inverters are less suceptible to load variations. Here is some education on those http://dogstar.dantimax.dk/tubestuf/paraph.htm

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