Differential Amplfiers - current sources under/over the triodes - Page 4

Wavebourn · 27th January 2012, 02:20 AM

Quote:

Originally Posted by Hearinspace

Wasn't there a line used to describe Chaos Theory that went something like "When a butterfly flaps it's wings in New York it leads to a typhoon in China." ? Maybe you've started more than you imagine . . . . . . . .

Well; I would not object if somebody in China flaps wings, so my business benefit from it somehow a little bit...

SpreadSpectrum · 27th January 2012, 02:22 AM

Quote:

Originally Posted by Hearinspace

Just out of interest, Why is the 2N5115 almost $100? (at Mouser anyway) Is it a special part?

Thanks

Because it is obsolete and supply is now limited.

Hearinspace · 27th January 2012, 02:57 AM

Quote:

Originally Posted by SpreadSpectrum

Because it is obsolete and supply is now limited.

I had that thought but I figured that parts are usually superseded by new ones that fit into the same role but with better performance.

Quote:

Originally Posted by Wavebourn

Well; I would not object if somebody in China flaps wings, so my business benefit from it somehow a little bit...

Well, the only help I can offer is to extol the virtues of your SVCS design. I haven't heard a better SS plate load (yet

). I'm hoping this weekend to build my first differential amp and I've already built a couple of SVCS to load the driver plates which will be DC coupled to the output tube grids. . . . . . I've been wondering if an SVCS style circuit could also be made to suit the LTP of the output tubes. I think about this because I haven't heard a transistor DC current source I really liked yet - Of course some are easily better than others but something about the sound eventually makes me seek a change. After ten years of trying different circuits and fine tunings I realized the source of the irritation was the current source itself the first time I heard the SVCS.

SpreadSpectrum · 27th January 2012, 03:12 AM

Sometimes there are designs that need that particular part for whatever reason and people are willing to pay that much to make a few more. Either that or they are too dumb to find another part that will work. Anyway, the parts suppliers will gouge if they can get away with it.

Hearinspace · 27th January 2012, 02:50 PM

I hear you ! 'Saw WBT solder at $316 for a 500gm. roll a couple of days ago. I'm trying Johnson now.

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27th January 2012, 03:12 AM	#34
SpreadSpectrum diyAudio Member Join Date: Nov 2007	Sometimes there are designs that need that particular part for whatever reason and people are willing to pay that much to make a few more. Either that or they are too dumb to find another part that will work. Anyway, the parts suppliers will gouge if they can get away with it.

27th January 2012, 02:50 PM	#35
Hearinspace diyAudio Member Join Date: Jun 2008	I hear you ! 'Saw WBT solder at $316 for a 500gm. roll a couple of days ago. I'm trying Johnson now.