The F6 Revisited

[TungstenAudio]

I don’t think those will work for the F6.
They are suitable for autoformer applications.

 

[Zen Mod]

if you look at schematic, 3 repeaters are connected primary to primary, secondary to secondary, obeying phases

so, how you gonna connect it/them in circuit, that's matter of main board, not Daughterboard

now, if you are talking abut preferences - Jensen vs, Cinemag or Edcor, in normal xformer configuration, that's other thing

I didn't found Jensen superior at all to Cinemag, and I'm liking Edcor more than Jensen, even if Jensen is certainly having more detailed sound

 

[TungstenAudio]

The secondaries should not be connected for use in an F6. They need to be completely independent. Otherwise they won’t work for the phase inversion function.
This can be corrected with a careful trace cut, but Xacto knives can be tricky to use well.

 

[Zen Mod]

ha!

that's main reason which I didn;t catch during first morning coffee time

which excludes Edcor and leaves "just" Cinemag in game

is it worth trouble making Daughter boards for that?

 

[TungstenAudio]

True, the Edcor PC600:600 won’t work for this. They have another model which is 1/2 Watt tri-filar winding. It can work, but it is much larger than the other two and has 12 pins, making it very difficult to fit with the others.

 

[Zen Mod]

correction, this is good for F6

but, it will not transform it in Square Law OS

 

[TungstenAudio]

Needed some coffee as well..
Yes, that looks good for the F6. The CineMags are built with a surplus of pins, but they sound excellent. And Pa likes them, so enough said.
Thank you for providing a simple daughterboard solution for greedy boyz and girlz.

The elusive Square Law OS may need a different amp. I have enjoyed trying some different power transistors. The IXTQ75N10 proved to be a good high transconductance option. The IRFP048 worked well in the lower voltage F6 JFet build, and would also be suitable for higher voltage rails for the more adventurous DIY builders.

 

[Zen Mod]

yup

even SQL would need some play with, to have desired THD Spectra

with pair of IRFP150, for instance, 3rd dominant, pinpoint machine

to invoke 2nd dominant, say 240 up and something even wilder than 150 down

 

[gary s]

Very nice work on the repeater pcb Zen Mod, and quick.

With regards to the Cinemag's, are you using the high Ni version or the standard? Is there a separate part number for the PCB version with pins as against the standalone version with leads? I would like to compare these with the Jensen's.

Also, where are members buying them from in the US - can you order direct from Cinemag? There is no distributor here so will have to buy them OS.

 

[Zen Mod]

I had that triple version already made whoknowswhen, as building bock for my concoctions

all what was needed is to draw Dimension (pcb boundaries) and produce set of files you see attached

and then - when Tungsten pushed me in right direction, deleting Edcor was trivial

xformer types you can see at render bottom pic

Cinemag - yes, directly from them

both low nickel and hi nickel are good; let mood decide

 

[Nelson Pass]

I am using the CMOQ-4PLC, as originally recommended to me by Jam Somasundram.

My information is that they are cheaper and more available than the Jensen JT-123-FLPCH.

I find them similar, Jam prefers the Cinemag, and availability/pricing cement the decision.

Of course if price is no object, then you want to contact Dave Slagle - Intactaudio.com

 

[Zen Mod]

Pa, what was the reason for decision to use primaries in parallel, vs. using them in series, then just adjusting NFB to keep same CLG?

reckon, easier load to buffer

though, purely academic observation (even if ZM far from being related to anything academic; well, except devising Egocentric ACA )

 

[gary s]

Thanks ZM and NP.

 

[Zen Mod]

Option 1: Who's ZM??

Option 2: Who's NP??

 

[gary s]

Well, the Official Court Jester (living up to his name) and The One and Only!! Where would we be without the 2 of them.

 

[Zen Mod]

IMPORTANT (ZM shouting)!

ignore files in posts #140 and #146

@grimberg spotted that I didn't had enough coffee while messing with pinout of Cinemag

will correct and re-post proper

 

[gary s]

Thanks for that update ZM, as I want to get some of these, will wait for you next revision .

 

[gary s]

Looking at both datasheets, I think the connections are:

Jensen pin 1 to Cinemag pin 2
Jensen pin 3 to Cinemag pin 4
Jensen pin 2 to Cinemag pin 3
Jensen pin 4 to Cinemag pin 5
Jensen pin 5 to Cinemag pin 8
Jensen pin 7 to Cinemag pin 10
Jensen pin 6 to Cinemag pin 9
Jensen pin 8 to Cinemag pin 11

Hope you agree ZM.

 

[grimberg]

Agree. That is how I configured my dual-footprint PCB.

 

[Zen Mod]

here it is, as it seems that my brain is better while having night coffee, anyways