F6 Amplifier

[Antoinel]

Got three of them. Their base schematics are those shown in the article by Mr. Pass which is entitled: "The Zen Variations-Part 2; The Penultimate Zen's Current Sources. The attached file is ConceptualF6#0. I added a large bypass capacitor across R1, a blocking capacitor C2' at the collector of ZTX550, and of course the Jensen transformer. I hope that I got the phasing of the signals correctly on the secondaries.

[Antoinel]

Originally Posted by Antoinel

Got three of them. Their base schematics are those shown in the article by Mr. Pass which is entitled: "The Zen Variations-Part 2; The Penultimate Zen's Current Sources. The attached file is ConceptualF6#0. I added a large bypass capacitor across R1, a blocking capacitor C2' at the collector of ZTX550, and of course the Jensen transformer. I hope that I got the phasing of the signals correctly on the secondaries.

Here is the second one ConceptualF6#1.pdf: I believe my additions to the basic skeleton are clear, and I have the correct signal phasing on the transformer secondaries.

[Antoinel]

Originally Posted by Antoinel

Here is the second one ConceptualF6#1.pdf: I believe my additions to the basic skeleton are clear, and I have the correct signal phasing on the transformer secondaries.

The third schematic is ConceptualF6#2.pdf which is a Jensen transformer-coupled Aleph current source. Use JFETs instead of MOSFETs in the three candidate schematics so as to be commensurate with Conceptual F6 methodology.

[lhquam]

Nelson:

I am trying to understand the mechanism of the secondary loading on the harmonics. With the Jensen JT-123-FLPCH I haven't been able to detect a significant effect from secondary loading.

Originally Posted by Nelson Pass

You are overlooking another location for trimming the cancellation, which is
resistance across the secondary coils. Typical values would be on the order
of 200 ohms or more.

[buzzforb]

Wouldnt altering the resistance/impedance of the secondary affect the reflected impedance and thus voltage ratio/amplification factor, changing the gain sligjtly. Similar to what Zen pot does on output. Dunno,just guessing.. Gotta go lay baby girl down.. sweet dreams!

[Zen Mod]

load/unload two secs differently

[bobodioulasso]

Makes divider with gate stopper?

[generg]

Originally Posted by Zen Mod

load/unload two secs differently

that´s it!

[Zen Mod]

Originally Posted by bobodioulasso

Makes divider with gate stopper?

nope

just resistor across secondary,creating constant load

same as you walking with or without sack of cement on your shoulder(s)

or constant felt brake under EMT927/930 platter

Originally Posted by buzzforb

Wouldnt altering the resistance/impedance of the secondary affect the reflected impedance and thus voltage ratio/amplification factor, changing the gain sligjtly. Similar to what Zen pot does on output. Dunno,just guessing.. Gotta go lay baby girl down.. sweet dreams!

loading secondary will decrease amplitude

so , speaking of directly altering modulation of gate , not influencing xconductance shape , as with ZAP

[bobodioulasso]

Originally Posted by Zen Mod

nope

just resistor across secondary,creating constant load

Of course, gate stopper is negligible in front of high Z gate.
I am stupid.