F6 Amplifier - Page 181

vdi_nenna · 13th September 2012, 07:55 PM

Quote:

flg. Is the Avatar you show your living pet Jack Russell?

That's not a Jack. I own a Jack. The snout is a bit smaller and ears are shorter on a JTR. Then again, who knows with dogs. Ever see an Irish Jack? They have tiny legs.

Antoinel · 13th September 2012, 08:00 PM

Quote:

Originally Posted by vdi_nenna

That's not a Jack. I own a Jack. The snout is a bit smaller and ears are shorter on a JTR. Then again, who knows with dogs. Ever see an Irish Jack? They have tiny legs.

I hope flg names the breed of the dog he shows as Avatar. There will be no confusion with the pic of Bella. Classic OES.

lhquam · 13th September 2012, 08:18 PM

Hey DIYers. We've been forgetting to look under some important rocks. Think about Papa's efforts during the past year or so. The previous amp circuit was the F5-Turbo, which has the downside of thermal instability as the turbo-diodes heat up. With the temperature coefficient of the SemiSouth R100's perhaps this problem is resolved. Thus, Papa devised the quasi-comp R100 circuit with a transformer as phase-splitter. Now put turbo diodes in parallel with the source resistors.

I did a simulation of this. I need to put together a breadboard and see about thermal stability.

buzzforb · 13th September 2012, 08:26 PM

I can pop them into my breadboard and see, but it seems we have already achieved something similar with low Rs.

Zen Mod · 13th September 2012, 08:32 PM

yup

1000Volts · 13th September 2012, 08:33 PM

Forgive me but.... Now we want transitors that act like triodes. Then we want to put them in tube like circuits. Or at least borrow heavly from tube circuits of yore. I guess it can't be helped. Since, a lot was discovered in audio during the tube age. Hard to come up with really new ideas. And nothing wrong with any of this. It worked in the past. Its just interesting to see how things have come almost full circle. From lets chuck out the transformers. To, hey, those transformer ain't as ugly the morning after........ Let me crank up my tube amp now.......

lhquam · 13th September 2012, 09:30 PM

Yup to which? "... we have already achieved something similar with low Rs. " or "Now put turbo diodes in parallel with the source resistors"

Quote:

Originally Posted by Zen Mod

yup

buzzforb · 13th September 2012, 09:31 PM

Lower Rs sounds better to my ears. I have .25Rs in there now. Going to try .1, but think this may be pushing it.

Zen Mod · 13th September 2012, 09:33 PM

Quote:

Originally Posted by lhquam

Yup to which? "... we have already achieved something similar with low Rs. " or "Now put turbo diodes in parallel with the source resistors"

no need for diodes with so low Rs

anyway - we aren't going to make welder of this amp

lhquam · 13th September 2012, 09:37 PM

0R12 is what I have been listening to.

Quote:

Originally Posted by buzzforb

Lower Rs sounds better to my ears. I have .25Rs in there now. Going to try .1, but think this may be pushing it.

13th September 2012, 08:26 PM	#1804
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I can pop them into my breadboard and see, but it seems we have already achieved something similar with low Rs. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

13th September 2012, 08:32 PM	#1805
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	yup __________________ 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

13th September 2012, 09:31 PM	#1808
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Lower Rs sounds better to my ears. I have .25Rs in there now. Going to try .1, but think this may be pushing it. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

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13th September 2012, 08:18 PM	#1803
lhquam diyAudio Member Join Date: Mar 2010 Location: Olalla, Oregon: Land of the 100 Valleys	Hey DIYers. We've been forgetting to look under some important rocks. Think about Papa's efforts during the past year or so. The previous amp circuit was the F5-Turbo, which has the downside of thermal instability as the turbo-diodes heat up. With the temperature coefficient of the SemiSouth R100's perhaps this problem is resolved. Thus, Papa devised the quasi-comp R100 circuit with a transformer as phase-splitter. Now put turbo diodes in parallel with the source resistors. I did a simulation of this. I need to put together a breadboard and see about thermal stability.

13th September 2012, 08:33 PM	#1806
1000Volts diyAudio Member Join Date: Dec 2009	Forgive me but.... Now we want transitors that act like triodes. Then we want to put them in tube like circuits. Or at least borrow heavly from tube circuits of yore. I guess it can't be helped. Since, a lot was discovered in audio during the tube age. Hard to come up with really new ideas. And nothing wrong with any of this. It worked in the past. Its just interesting to see how things have come almost full circle. From lets chuck out the transformers. To, hey, those transformer ain't as ugly the morning after........ Let me crank up my tube amp now.......

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