F6 Amplifier - Page 281

Zen Mod · 15th November 2012, 07:12 PM

I'm reading ya posts all the time

what's situation about K2/K3 tweaking with Iskra ?

buzzforb · 15th November 2012, 08:24 PM

Quote:

Originally Posted by generg

surprise....

i tried to get down k2 with the Edcor with the trim pots and it did not work. The smallest distance I could manage was 10db. I tried both secondaries lower and upper.

So the Edcor seems to have a k2 dominance build in and you can not really shape your sound man....

My difference in sound was coming with cap placement. Did you use source resistors or go the naked route posted by ZM. I stopped with .15r on both, with one cap connected directly to sorce on one fet. Cant remember now. I wonder if zen pot works more successfully with larger Rs values, where it would affect gain more.

generg · 15th November 2012, 08:39 PM

Thanks buzz!

I use the "naked" official scheme Nelson published. Tomorrow I will look how the ISKRAS behave and report to Zen Mod especially (minority report)

buzzforb · 15th November 2012, 08:57 PM

Big honkin trafo fro golden era might surprise.

kasey197 · 16th November 2012, 01:22 AM

generg, perhaps in this case, it might be easier to dial in what you want using lhquams love-pot method instead of loading the tx secondaries....if u use small Rs (0.1R?), the effect on class A availability and gain would be small but you can still tune H2 mix and decide also whether you want it on +ve going vs -ve going phase.

generg · 16th November 2012, 07:46 AM

Interesting, thank you I will give it a try!

dantwomey · 16th November 2012, 12:46 PM

Anyone thinking about F6 PCBs?

Regards,
Dan

CeeVee · 01:25 PM

Quote:

Originally Posted by dantwomey

Anyone thinking about F6 PCBs?

Regards,
Dan

For which trafos ?

Maybeso master ZM can tell us where to find some ISKRAS....heheh

..you thinking about Papa standard Jensen ?

Zen Mod · 16th November 2012, 01:30 PM

Quote:

Originally Posted by CeeVee

For which trafos ?

Maybeso master ZM can tell us where to find some ISKRAS....heheh
.....

no way , Jose .......

unobtanium .....

Quote:

Originally Posted by CeeVee

......

..you thinking about Papa standard Jensen ?

what else ?

buzz can buzz is Onetics same in physical layout

BudP have all my trust

buzzforb · 16th November 2012, 01:35 PM

ceeVee nailed it. Pinouts are different, at least on the Onetics vs Jensen. ......Then again, I will hae to look, cause with the F6, you can do all kind of crazy things.

Point for point, they are different. Flochini will be listening to Onetics soon, So i think we will get even more back up for Bud's xformers. Cant work on speaks for various reason, so might try to setup measurement rig and get some numbers on the Onetics system, since evrybody loves numbers around here.

15th November 2012, 07:12 PM	#2801
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	I'm reading ya posts all the time what's situation about K2/K3 tweaking with Iskra ? __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

15th November 2012, 08:39 PM	#2803
generg diyAudio Member Join Date: Jul 2009 Location: Near Frankfurt	Thanks buzz! I use the "naked" official scheme Nelson published. Tomorrow I will look how the ISKRAS behave and report to Zen Mod especially (minority report) __________________ and the First Wtt is......a really First Class PSS Idea !

15th November 2012, 08:57 PM	#2804
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Big honkin trafo fro golden era might surprise. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

16th November 2012, 07:46 AM	#2806
generg diyAudio Member Join Date: Jul 2009 Location: Near Frankfurt	Interesting, thank you I will give it a try! __________________ and the First Wtt is......a really First Class PSS Idea !

16th November 2012, 01:35 PM	#2810
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	ceeVee nailed it. Pinouts are different, at least on the Onetics vs Jensen. ......Then again, I will hae to look, cause with the F6, you can do all kind of crazy things. Point for point, they are different. Flochini will be listening to Onetics soon, So i think we will get even more back up for Bud's xformers. Cant work on speaks for various reason, so might try to setup measurement rig and get some numbers on the Onetics system, since evrybody loves numbers around here. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!


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16th November 2012, 01:22 AM	#2805
kasey197 The Dastardly Dad of Three diyAudio Member Join Date: Sep 2009	generg, perhaps in this case, it might be easier to dial in what you want using lhquams love-pot method instead of loading the tx secondaries....if u use small Rs (0.1R?), the effect on class A availability and gain would be small but you can still tune H2 mix and decide also whether you want it on +ve going vs -ve going phase.

16th November 2012, 12:46 PM	#2807
dantwomey diyAudio Member Join Date: Feb 2002 Location: Canada	Anyone thinking about F6 PCBs? Regards, Dan

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