F6 Amplifier

[buzzforb]

I went through the room issues. Hapeems even with speakers pulled out into the room and setup in a very balanced way and me in the nearfeild. I matched all components methodically. It basically amounts to a perceived increase in output from the higher mF channel. Subtle but there. I even went to the trouble of switching PSU boards with main boards and still noticed it. I didnt mention it to create an OT, just to reiterate the point that there are many different variables in building an amp. THe F6 has shown us this. If you are building a "final case", I believe you should be thinking dual mono.

 

[lhquam]

I went through the room issues. Hapeems even with speakers pulled out into the room and setup in a very balanced way and me in the nearfeild. I matched all components methodically. It basically amounts to a perceived increase in output from the higher mF channel. Subtle but there. I even went to the trouble of switching PSU boards with main boards and still noticed it. I didnt mention it to create an OT, just to reiterate the point that there are many different variables in building an amp. THe F6 has shown us this. If you are building a "final case", I believe you should be thinking dual mono.

Two other options to full dual mono:

1. Transformer with 4 secondary windings, 2 for each channel.
2. Nelson's CRRCC hack, where 2 secondary windings supply the first cap banks, and each amplifier is fed from its own RC filter banks beyond that.

Both options are compromises. Spacewise, both options are good. Soundwise, I am sure option 1 is better. The question is how much better is having totally separate transformers.

 

[buzzforb]

I think it is a splurge to some degree, but seems to be the widely held opinion of many, whatever thats worth. I will more than likely have 2 or 3 "final" amps. They will be dual mono.

 

[Zen Mod]

think mono

think

tube

damn

sissy .


bugs

 

[buzzforb]

You need to take your meds.
How is my fair lady coming along. Babydiya has to be marching with pitchforks by now.

 

[Zen Mod]

ook ya , I'm all meds , all the time

fell in da Kettle as a kidoe , same as Obelix

going 'morrow to Sea , for two weeks

 

[buzzforb]

Enjoy. Make sure you wear your floaties and tie off.

 

[Antoinel]

ook ya , I'm all meds , all the time

fell in da Kettle as a kidoe , same as Obelix

going 'morrow to Sea , for two weeks

Which Sea? Did you know that SPF30 gives 97% protection and is fully adequate Any higher SPF values give an added 1-2% improvements and were deemed a waste of money. And one may have to use a full container [ not a tablespoon] of SPF30 during a day in the sun to get protection. Have a great time.

 

[jacco vermeulen]

fell in da Kettle as a kidoe , same as Obelix

Pal, you fell in the sausage barrel.
Enjoy your holiday with the 2 other unshaven ones.

 

[jacco vermeulen]

Make sure you wear your floaties

Now that's what I'd call a big red rubber.
(drowning dick phobia ?)

 

[buzzforb]

Pumps included.

 

[Zen Mod]

it is supposed to be amp thread ;

so : http://goo.gl/maps/SPtIQ

 

[lhquam]

Here is an idea for an F6 variant using 2 bifilar transformers rather than 1 quadfilar. Note that the P3 pot is back, to null H2.

 

[buzzforb]

That looks like BA3.

 

[lhquam]

That looks like BA3.

Huh?

 

[lhquam]

Here is a simplified version, with or without cascoding.

 

[lhquam]

Here is a simplified version, with or without cascoding.

Have I diverged too far from the original F6 design for this to be considered?

 

[generg]

No, for my feeling you kept the core!


Very interesting variations!

 

[dimkasta]

If you are using reversed complementary fets on the minus side there is no actual need for the transformer.

You are re-reversing it

To be more in the spirir of F6 (same device symmetry etc) I would use the same cascode up and down and just connect rhe down part to the other transformer side

However the transformer feels a bit redundant if we use both complementary parts. It becomes more of a flavour than a practical element.

 

[buzzforb]

Huh?

THe Jfet FE of BA3 FE is a unity gain phase splitter, sorta like a transformer. Well, if you split into two, that is what you have. Just ramblings of idle mind. I like The F6CC if it can retain the nature of F6 and improve performance.