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Old 2nd December 2009, 05:54 AM   #11
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Default Hello Taj, i am glad to see you here.

About output pairs quantity i am still thinking about...because this depends if i wil use the E/I protection or not (working not good in the simulator)

With the protection installed, you kill sonics and save power transistors, a matter of decision to be taken.

Yep, the old and good 2SC5200 and 2SA1943 can be used, also others alike MJL21193/MJL21194, and J415/J425.

I am collecting some ideas from forum folks... From John Curl and Roender, the increase into driver's current to increase linearity... from MJL21193 i am capturing (stealing) the CCS into the differential, also Bigun and Ostripper use this too, from the lovely company, the Electrocompaniet i am using a CCS to feed the drivers, from my own circuits the rail voltage regulator, maybe will use rail diodes (positive and negative) as Mr. Hugh Dean use, the old bootstrapp circuit feeding VAS and biasing output will be used too, current sink, double transistor VAS (Doctor Self)...well.... a collection of interesting ideas that i intend to put to play together...will see if it will sound fine, i hope it will.

I will be removing features if needed, will listen and compare with the CCS and without the CCS, in the past i have perceived lower distortion and more punch at the bass.

Will start to assemble the prototype to inspect waveforms and to listen.... in 24 hours i will have something playing into real world...not pretty,but reproducing a pretty nice sound (I hope)

regards,

Carlos
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Last edited by destroyer X; 2nd December 2009 at 05:57 AM. Reason: I always need to correct language, and to read to see if make sense, because foreign language refered to my native language
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Old 2nd December 2009, 08:43 AM   #12
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Default Here you have the previous (untested real life) schematic

For sure will work, but will need some tuning and neutralization.

You see, remembers the HRII and the Precision 1.... well, of course is based on them.

This is the best i can do..will listen today.

regards,

Carlos
Attached Images
File Type: jpg Fourier.jpg (624.7 KB, 215 views)
File Type: jpg Watch this beauty!.jpg (779.9 KB, 219 views)
Attached Files
File Type: pdf DXM.pdf (83.7 KB, 50 views)
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Old 2nd December 2009, 08:53 AM   #13
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Default Build a Dx amplifier, a guarantee of satisfaction

Here you have the Dx TriAmp that is sounding absolutelly lovely!

And the other picture is the Dx Corporation Support Staff... this personnel has expertise in the logistic to feed the supplies stock.

When you build a Dx Amplifier you're building tradition and sonic excelente..the only one defended by the 300 from Sparta... there are more than 300 satisfied builders of this DIY brand.

Carlos
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File Type: jpg Guaranteed.jpg (926.1 KB, 219 views)
File Type: jpg Support staff.jpg (530.8 KB, 180 views)
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Old 2nd December 2009, 01:18 PM   #14
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Default Health issues (bad blood circulation into my legs) forces me to slow down

This way the progress will be less fast this time.

regards,

Carlos
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File Type: jpg DXM aa.jpg (390.8 KB, 164 views)
File Type: jpg DXM bb.jpg (476.3 KB, 87 views)
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Old 2nd December 2009, 04:20 PM   #15
Bigun is offline Bigun  Canada
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Carlos,

When I was playing with the simulator and looking at double transistor VAS for TGM3 I noticed that there were some benefits if you split Cdom so that each VAS device has it's own Cdom capacitor - kind of like two-pole compensation that Dr. Self also loves very much. I never built this circuit so I don't know if it works well or sounds good but perhaps you can consider this ?


p.s. I love the 'DX PCB' technique !
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Old 2nd December 2009, 05:05 PM   #16
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Default I will try during the listening tests...because at the simulator

i cannot see the advantage (my know how to use simulators and some analisis is very limited).

Will split and listen.

I would like to find Andrew T, he made a suggestion, one day in the past, to include a low ohm resistance into the VBE multiplier, i want to try his idea too.

thank you,

regards,

Carlos
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Old 2nd December 2009, 08:59 PM   #17
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Default DXM protype is ready to play tomorrow morning

a few connections, adjustments and them pleasant moments!

Metalic plates are shield, it is grounded, a ground plane if you want to understand this way.... a flying over ground plane.

regards,

Carlos
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File Type: jpg Prototype.jpg (301.1 KB, 71 views)
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Last edited by destroyer X; 2nd December 2009 at 09:05 PM.
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Old 2nd December 2009, 09:08 PM   #18
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Default This new forum attachment feature is bothering me a lot!

Delay too much and it is failing.

Because of that i will upload to a hostess site.

Metal blades are shields folks.

regards,

Carlos

Click the image to open in full size.
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Last edited by destroyer X; 2nd December 2009 at 09:10 PM.
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Old 3rd December 2009, 03:21 PM   #19
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Default DO NOT BUILD! .... result a lemmon!

I found unstabilities, then the CCS was removed and the traditional circuit was assembled in place... sound stérile...then i have removed the CCS to drivers, result much better...well.... finally, resulted alike Precision 1

No reason to build another Precision 1.... it is good enougth.

The project is dead...not aproved by the Dx Corporation Chairman.

Thank you and sorry by the bad results...yeah!..maybe my board.

Audio quality had not advantage compared to earlier Dx products!..not acceptable this way.

regards,

Carlos
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File Type: jpg Design rejected.jpg (167.4 KB, 41 views)
File Type: jpg DXM, not aproved!.jpg (97.4 KB, 43 views)
File Type: jpg not aceptable.jpg (302.5 KB, 45 views)
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Old 3rd December 2009, 05:12 PM   #20
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Default Not so fast...

We received some expectations from DX corporation on something new and exciting. We are asking the Chairman not to suspend operations at the first hurdle, please ?

I like the photo giving side view, looks like components are trying to walk with their feet caught in some sticky silver mud !

If we have to stop here I would at least be interested to learn more of why it got stuck, for my learning at least - I didn't fully understand the instability - is it with the CCS loading of the LTP, or the CCS loading of the driver stage ? where do think is the problem - where is the too many phase shifts occuring ?
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