F6 Amplifier

[buzzforb]

Originally Posted by Nelson Pass

One of the charms about the transformer vs JLH/PLH phase splitter is that
it delivers pure symmetry in the same way a circlotron does - each like
polarity part is subjected to the same conditions, although in opposite
phase.

It is possible to do this with a phase splitter ala JLH/PLH, but if you look
carefully you will see that the bottom output device is run Common-Source
mode and the top device is Common-Drain. It is a rare circuit that will
deliver real symmetry under these conditions.

Very cool. Class in session. Apparently i am the only one surprised or impressed, post hoc, that is..

[Melon Head]

Will this circuit switch to Class B or will it current clip like the JLH?

[Zen Mod]

it will

[Melon Head]

You bastard.

[Vix]

If it can, it will.

[Antoinel]

Originally Posted by Zen Mod

Pa , please clarify .

I'm dumb ........ I can't see any meaning in driving both gates in phase , if that's meaning of "matched" ;

I certainly didn't look at first post pic thoroughly ......... and now I see that secondaries are really connected to drive gates in phase ........

if yes , then upper and lower modulation must be different in amplitude , intentionally ........



off course , there is always possibility that you're pullin' da leg of poor ZM

A clarification by Mr. Pass is important. Are the signals acting in phase on the FETs or not? The old style technology of OTL was NOT,and the bjt semiconductors needed to be matched which will be guaranteed in F6. But suppose the answer is YES. ZEN MOD you began analyzing its operation [bolded],and may need to continue to explain it further for our benefit.

[flg]

Originally Posted by Nelson Pass

...it delivers pure symmetry in the same way a circlotron does - each like polarity part is subjected to the same conditions, although in opposite phase... ...It is a rare circuit that will deliver real symmetry under these conditions.

How exactly does that happen? I see that the secondaries are refrenced to the Source's. So the output transistors recieve the same signal but, we are taking a Drain output from common source and a source follower output and "summing" them. Those aren't the same conditions? There are a few peices missing?

[buzzforb]

My question concerns the effect of the output fets operation on the signal. Sy stated in his Impasse article that a phase splitter was symmetrical if presented with a symmetrical load, but if the two loads were different, then it affected the tru symmetrical nature of the phase splitter. I think you see an exampl of this in the PLH. IT is a phase splitter, but i it is not driving equal loads, as you have a common drain and common source outputs summing into the load. THe transformer presents symmetrical signals out of phase to the two output fets, but they still will react differently to that signal,,, I would think.

[Melon Head]

Originally Posted by Vix

If it can, it will.

RIGHT. THE NEXT PERSON TO BE A BLOODY BASTARD HERE WILL HAVE THE PLEASURE OF SEEING MY TWO GIRLFRIENDS IN BIKINIS.

[Melon Head]

I reckon Nelson is laughing his ars3 off right now. I don't think I remember a time whete he had everyone dumbfounded.