F6 Amplifier

[buzzforb]

Originally Posted by 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.

I thought that was every time.

[Melon Head]

lf the windings on the secondaries are assymetrical that is to get equal summing of gain at the output. Then you have true symmetry
That is if the voltage gain of the secondary going to the source follower (common drain) is equal to tne voltage gain of the common source device then you have symmetry. So one secondary has voltage gain but the other does not have voltage gain

[buzzforb]

HAHA! you edited! I still think there is a surprise in there somehwere. It wouldnt be Nelson without it. Thats why ZM is laughing. He knows better

[Melon Head]

The surprise is the bloody feedback loop

[flg]

In the J/PLH, the phase spliter (driver) signal presented to the comon source output transistor is the same polarity and level as presented to the driver itself. However, the signal from the Drain of the driver transistor to the Source Follower output transistor is opposite phase.
In the F6 scheme, the signal present to the transformer (driver) is passed through the transformer with some turns ratio (gain) ??? And, the polarity of the signal presented to both output transistors is the same.

[flg]

The feed back is suming some portion of the output voltage with an opposing input voltage(oh boy, here we go?). For instance, if you only had a gnd on the input primary, instead of those resistors, it would see the full input signal. If the feedback resisters xfrm'r etc. caused that node to have 1/2 the signal level of the input voltage, the primary would only effectively have 1/2 the voltage

[Zen Mod]

Originally Posted by Antoinel

...... ZEN MOD you began analyzing its operation [bolded],and may need to continue to explain it further for our benefit.

no need for that , I already made enough a fool of my self in this thread

there are just two possible paths - either modulating gates in antiphase (so result is push pull or sort of ) ....... or in phase , but with upper modulation smaller than lower one .
that way effects can be interesting - varying difference in modulation will vary your amount of Zen

call it xformerised thingie fooling around , same as Mu , following some other paths

don't be surprised if full schm reveal some other wakoo ways of Zen practice ;

Papa is often having redish eyes ........

[Melon Head]

The signals have to be phase split after the transformer otherwise I have no idea how it could be considered symetrical at the output. If not then I will be buying Nelson more wine

[Zen Mod]

Originally Posted by Melon Head

lf the windings on the secondaries are assymetrical that is to get equal summing of gain at the output. Then you have true symmetry
That is if the voltage gain of the secondary going to the source follower (common drain) is equal to tne voltage gain of the common source device then you have symmetry. So one secondary has voltage gain but the other does not have voltage gain

yadayada

(imagine picture of Manuel "Que?" here ............ )

Originally Posted by Melon Head

The surprise is the bloody feedback loop

hardly , if you ever burned anything yours on hot tube ; but (as usually) hat off to Pa , for taking old tricks from hat

real surprise is twisting da twist - using xformer instead of current mirrors

again .......... out of box ; lateral thinkin'

[Zen Mod]

Originally Posted by Melon Head

..... I will be buying Nelson more wine

exactement ......