F6 Amplifier

[buzzforb]

That speak looks like it can push some air! Is that waveguide loaded tweet or FR on top?

[Zen Mod]

I gave you Jacks picture , and you're asking for spks ?

bloody Greedy Boy ......

[buzzforb]

Ill never have chance to meet Jack, but those speaks.....You know its speaks time in wakooyank world and I want BIG!

[Zen Mod]

just to make this thread even more hysteric and biiig (both of these with my massive contribution ) - speaking of 6.2GB big Pass folder - that's not counting this (he naively left one of his PC's without surveillance ) :

edit: sorry , forgot second , appropriate picture ....

[buzzforb]

Thats quite a misic collection.

[generg]

Good morning, Zen Mod....

Dreaming of F7 and another thread......?

[Zen Mod]

naah ........

I can't keep up with Pa

always short for some of Babelfishes

[Antoinel]

Originally Posted by generg

to tame the BA-3 frontend you could use this variant with feedback....

Burning Amp BA-3b (Balanced)

but of course you have feedback in the system now.....

Dear gurus [generg, ZM, lhquam, flg, buzzforb,triode_al, and many others]. Please give me guidance regarding this burning question pertaining to the attached file which shows a hypothetical schematic of a burning amp and/or an F6 clone. flg: please note that this front end has voltage gain like you proposed in the 1340 string of posts [wimdehaan circuits].

• Where is a suitable feedback point from the output to the front end?

Not knowing any better, I tentatively put the letters F1 at the wiper of the Zen Pot R3, and F at the originally grounded primary lead.

Thank you, and kind regards.

[generg]

Hi Antoinel,

Please delete me from your list of gurus..... I really cannot answer your question.
I had to simulate it. But I think it might be possible, but a kind of overkill. I made a similar thing combining the best elements of different FW amps, the j-fet input stage from Aleph J, the CCS for the input stage from the BA-1 Frontend and the output part from BA-1. Of course it worked, but was it good? I do not know.

At the moment you are giving up a piece of the simplicity of the FW idea. The BA were thought for more power and demand of course other front ends with higher currents driving the 4-6 pairs...

And the xformers, for instance used in M2 tried to replace the voltage gain normally done by semiconductors by a step up transformer, with some advantages, inter modulation could be lower, and some disadvantages you know.

In your model you are combining a huge amount of semiconductors voltage gain and some gain in the transformer (overload?) and you may loose some driving current for the outputstage ?....the best of three worlds ......? I do not know....

[Antoinel]

Originally Posted by generg

Hi Antoinel,

In your model you are combining a huge amount of semiconductors voltage gain and some gain in the transformer (overload?) and you may loose some driving current for the outputstage ?....the best of three worlds ......? I do not know....

generg: thank you for honest answer. I am glad that you have aready done "mix and match" [or whatever you wish to call your practice] of Pass schematics. Please note that the output stage of the parent BA 3 Front End is a current source generator due to the opposed drains of its output MOSFETs, and absent an intra loop feedback. Thus, the voltage gain of this front end [in its Pass normal operation] is proportional to the value of the load resistor R13 [332 Ohms] in parallel with the high input impedance of the output stage. In the hypothetical schematic name it1035, R13 may be decreased at will to lower the gain to suit the need. This I hope may address your concern above regarding excessive OLG ; which is needed to sacrifice a portion of it anyway to make an amp with a stable closed loop gain of say 26 dB. This is an hypothetical objective.