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Old 12th September 2008, 11:29 PM   #611
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Location: Iowa
OK sorry to double post but I just hooked up a "choke". Well, it is actually the primary side of a stray transformer I had close at hand. I have been diddling with the V+ in the past few min, since it is on an adjustable power supply. The highs got HHHIIIGGGHHH and detail abounds, but my bass has all but disappeared! Not enough H? I am going back to the resistor for now even though the resistor sounds dark in comparison. I will have to throw a CCS together here soon, I have the bread board out so this weekend if I can find time. My girlfriend is home and we see each other like once every couple weeks, she might be upset if we spend the whole weekend watching me tinker

Cheers

James
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Old 13th September 2008, 04:25 AM   #612
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Better do some tinkering with your girlfriend!

I used my choke loaded version on the high-frequency horns, so I never had a chance to hear the bottom end.

Glad to read of your adventures.
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Old 13th September 2008, 05:20 AM   #613
lineup is offline lineup  Sweden
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Default Re: Lineup Audio, 2SK170GR jfet-boz version 1.0

Quote:
Originally posted by lineup

People havent got anything else to do, than download Nelson Pass PDF.
Well, for myself speaking: I do not do much anything else

Comment to my attached SCHEMATIC
Lineup 2SK170GR Jfet BOZ - beta version 1.0a

---------------
Regards
Lineup Audio Labs, the design division
/lineup
Do not forget this High Fidelity Hi-fi JFET Boz
that I contributed in the beginning of this topic.

That is, if you want one whole Level lower distortions.
Which is maybe NOT what all will like.
Not in this forum of Pass Labs
hehe, hehe, haha

Regards
Lineup
-------------------


See Post #93
for additional setup instructions
to Jfet BOZ modificated version
Attached Images
File Type: png lineup_2sk170-jfetboz-1.0a.png (11.4 KB, 1404 views)
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Old 13th September 2008, 05:45 AM   #614
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Hi John,
How's the house progressing and the 'bung' shoulder?

Lineup,
Had forgotten about this variation, could this be added to Nelson's B1 Lightspeed buffer with similar results?
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Old 13th September 2008, 03:39 PM   #615
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So my girlfriend is out shopping with her mom this morning so I go some time to tinker with a CCS. I basically closed my eyes and reached into my parts collection and pulled out some random resistors and passives. It is a very basic CCS, red LED to the base of a BC560, 10k from there to ground. There is a 22R from the V+ rail to emitter, lastly and obviously, the collector to the drain. I hooked the whole thing up across a Fluke and more or less the current varies very nicely as I turn the voltage on the power supply up or down. In other words nothing is optimized.

From there I hooked the whole thing up to the JFET BoZ, my one with the LED in the source. I then proceeded to turn the voltage and consequently current up and down until I hit a sweet spot...see very very not optimized. I will say, what a sweet spot. Almost no noise at all, very close to inky blackness in the background. Dynamic, detailed, yet still very sweet sounding. It will really take some more tinkering but right now I am impressed with even this basic CCS.

Time to listen

Cheers

James
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Old 13th September 2008, 03:45 PM   #616
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Join Date: Nov 2004
Location: Bruchsal/Germany
Can somebody help me ?
want build a pre a la Fulling
Page 20 , post 483
with BF 245 C (Fulling has used B)
his version was with drain resistor
1k5 and source resistor 243R .
can anybody help me out with the
numbers for the C type ?

Greetings from Germany

Jürgen
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Old 13th September 2008, 03:51 PM   #617
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Quote:
Originally posted by JPeitzman
I basically closed my eyes and reached into my parts collection and pulled out some random resistors and passives.

I then proceeded to turn the voltage and consequently current up and down until I hit a sweet spot...see very very not optimized. I will say, what a sweet spot.
Ah yes, the Monte Carlo school of design.

People underestimate the importance of the "sweet spot". It's usually there, and you
can find it by varying all sorts of values, "wandering around the landscape".

Of course you have to recognize it when you see or hear it.

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Old 13th September 2008, 04:20 PM   #618
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Default Re: Re: Lineup Audio, 2SK170GR jfet-boz version 1.0

Quote:
Originally posted by lineup


Do not forget this High Fidelity Hi-fi JFET Boz
that I contributed in the beginning of this topic.

That is, if you want one whole Level lower distortions.
Which is maybe NOT what all will like.
Not in this forum of Pass Labs
hehe, hehe, haha

Regards
Lineup
-------------------


See Post #93
for additional setup instructions
to Jfet BOZ modificated version

Hello Lineup,

What tools are you using for the simulation in this post #93 and #97?

Thank you,

-David
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Old 13th September 2008, 05:29 PM   #619
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Quote:
Originally posted by jameshillj
Hi John,
How's the house progressing and the 'bung' shoulder?

Way off topic:

House is coming along... I'm painting the wainscoting in the stairwell. Will be for some time as I'm using a brush, not spray.

Shoulder's good enough to work. I'm still useful...

Hope all is well in your neck of the woods.

Here's a pic taken last winter:
Attached Images
File Type: jpg our house.jpg (67.7 KB, 1231 views)
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Old 13th September 2008, 06:27 PM   #620
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by carpenter


....... I'm still useful...

.........

indeed !

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