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Old 30th September 2004, 04:59 PM   #1
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Question Mystery (to me) phase inverter?

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
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Old 30th September 2004, 06:37 PM   #2
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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.
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Old 30th September 2004, 06:56 PM   #3
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Thanks for the information Sy.
Looks like I'll be going for the long tail pair PI sooner than expected.
Glenn
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Old 30th September 2004, 09:07 PM   #4
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Default Re: Mystery (to me) phase inverter?

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

cathodyne
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Old 1st October 2004, 06:52 AM   #5
Enzo is offline Enzo  United States
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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.
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Old 1st October 2004, 10:44 AM   #6
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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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Old 1st October 2004, 04:38 PM   #7
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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
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Old 2nd October 2004, 07:01 AM   #8
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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.
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Old 2nd October 2004, 07:24 AM   #9
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Quote:
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Fred had sent me a pile of them to me last fall.
I think i have a pile of those too...

dave
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Old 2nd October 2004, 02:51 PM   #10
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I only have two I think, but they're so hard to use, it might as well be a pile!!

Tim
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