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Old 27th July 2012, 10:41 PM   #1621
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Default This my map for Dx Blame ST

I'm getting ready for ST I made like a map to see how it look if I have an error please be free to correct me I don't mind at all. plus this really confuse me sometimes but here is a PDF file of my map for ST. I also later I'm going to order not now but the power supply boards, here is the picture of my first board inspire from Miguel Nabuco.

Regards
vargasmongo3435
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File Type: jpg ps4.jpg (180.2 KB, 360 views)
File Type: jpg Super Saiyan v1.0.jpg (84.1 KB, 345 views)
Attached Files
File Type: pdf Dx Blame Super Saiyan ST.LAY]2.pdf (79.3 KB, 95 views)

Last edited by vargasmongo3435; 27th July 2012 at 10:43 PM.
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Old 27th July 2012, 11:56 PM   #1622
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Default Good looking boards Vargas.

Congratulations.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 30th July 2012, 09:58 AM   #1623
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Default One amplifier, from my Dx amplifiers colection, sounds much better

It is a Dx Blame ST made using original Todd Johnson pcboards...he made the layout for us.

The unit reproduces a little bit more clear sound...more treble, less distortion and more dinamics...also a nice deep bass.....there is some difference in performance compared to other models.... but it has slightly more noise.... with your ears into the tweeter you perceive something even with the input shorted.

I do think the reason why is the use of BC546/556 transistors, also BD139 for VAS and the pair BD139/140 for drivers.

The circuit is almost the same...the input condenser is constituted by 2 units of 22uf/16 volts...i do think the small insulating voltage also play a roll in that stuff too (search for theories about electrolitic condensers operational voltage).

Also the output transistor is different..you can see in this video:

This Dx Blame ST is the one sounds better - YouTube

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 31st July 2012, 05:23 PM   #1624
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Default Found and error on my drawings

I was checking the orientation of the 2N5401 and BC556 and in my first drawings I made a mistake, so I use the data base information website of the components and fix it here are the illustrations "my bad" I didn't see it but after you turn the components 180 degree you don't realize things so I made a drawings to see how they look from top view of the PCB board here is.

Regards
Juan
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File Type: png 2N5401 2N5551.png (143.0 KB, 257 views)
File Type: png BC546 BC556.png (141.6 KB, 232 views)
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Old 31st July 2012, 05:49 PM   #1625
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Default Thank you Vargas..... a good help you correcting the stuff

I suggest Dx builders to try if they are using power supplies from 30 to 42 volts only.

Other models with higher voltage supplies should use 2Nxxxx and MJxxxx transistors.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 31st July 2012, 05:51 PM   #1626
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Default try out BC556/456!

I don't have them yet but soon I will try out!

Regards
vargasmongo3435
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Old 31st July 2012, 06:03 PM   #1627
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Default They are old, cheap, awfull, ridiculous transistors

Made of plastic...i you touch the case with the soldering iron the damn thing melts.... a shame.... i hate the way they make these transistors.

But the sound..... well... the sound makes me accept it is awfull, old, cheap, made of plastic, ridiculous and a shame.

I am not sure if the sound is really because of them...because of capacitances, internal construction and specifications...i do think they match with the currents and voltages perfectly....maybe reason are both.... as i said...i am trying to figure out these reasons... a real mistery to me.

Video link into the signature line will send you to a video about it.... a bad video, a terrible audio, but a good suggestion for you...give it a try and tell me what you have perceived.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 31st July 2012, 06:24 PM   #1628
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Here is from where I get that


Regards
Juan
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Old 31st July 2012, 06:31 PM   #1629
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Default Good Juan!.....be aware folks.... these transistors

have different lead position.... the substitution must be made doing the transistor rotation... a 180 degrées....base continues in the center, but emitter and colector are in different position and should be rotated.

So, if you already have 2N5401 and 2N5551 in your circuit, then when replacing by BCs you should rotate considering the previous position.... substitutions from BCs to 2Ns or from 2Ns to BCs must have this rotation.

The active components (input differential and first VAS transistor) should be the ones to replace, the others are auxiliary and will not make any difference in sonics if you replace them.

Second VAS transistor is BD139 and drivers are also BD139/140...matched within 20 percent in gain.... try the output units shown in the video too.... my units gain are around 200 measured using these cheap chinese digital multimeters.... so, it is the gain using the internal meter current and voltage...not exactly the gain you will have with 35 volts and the working current..it is just a reference to you..not the real thing...if you measure with these cheap multimeters, then you should measure around 200 of gain. (plus 20 percent or minus 20 percent as everything in analogue electronics and electricity)

This amplifier (shown in the video) was always better in sonics..... and the difference in quality you can perceive if you listen one and other..... if you never made the comparison..then you will never know the difference.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg

Last edited by destroyer X; 31st July 2012 at 06:36 PM.
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Old 5th August 2012, 04:51 PM   #1630
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Dear DX,

At last I found the energy again and the time to pay my debt to you, Rudi and Metal and build the DX Blame

A couple of questions, as I buy the rest of the BOM:

1) Does the Zobel network resistance need to be 5W?
2) Can I put the resistor and coil from the speaker output nearer the speaker connector, instead of on the PCB, with the coil mounted around the resistor?

It's hard to get these big R. Maybe I'll build my own 0R22 non-inductive/non magnetic

First I will be a chicken and build the stable ST...then I will get reckless and buid the ES, with separated supplies for the front stage and all the tricks I know for the PS.

Wish me luck.
M.
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