Well folks, this amplifier had 150 kits of boards sold in the Brazilian forum and 30 kits sold to an international forum.... we have Rudi Ratlos producing boards together Metal, and one international forum intend to produce boards to distribute....but this will delay a lot...maybe one year more.
Rudi is offering boards in a group buy in that international forum i was talking about, in the Group Buy section.
I have asked Microsim to order production of layout and also boards to this forum too... i hope he will accept what i have asked him.
You have a lot of information in Portuguese and English in this adress:
http://www.dx.kinghost.net/
Also you have all Dx amplifier in these home pages:
http://users.tpg.com.au/users/gerskine/dxamp/
and here you have a text that explains something to you... save this text if you intend to build one of my Dx Blame amplifiers:
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There’s a chart with all models and values to the resistances that have identification numbers (R1, C4, Q3 and so on)..... parts that are the same to all models have the value already printed in the board silk screen.... parts that may need to be changed to other value are identified with identification numbers (R1, C3, Q3 and so on)..... because the chart will inform the correct value to each one of the four models served by the same board.
Dx Blame ES - 50/100 watts... 8 and 4 ohms - uses 35 volts DC supplies (symetrical)
Dx Blame ST - 50/100 watts... 8 and 4 ohms - uses 35 volts DC supplies (symetrical)
Dx Blame MKII - 50/100/180 watts... 8/4 and 3 ohms - uses 35 volts DC supplies (symetrical
Dx Blame MKII Supercharged - 100/200 watts 8 and 4 ohms with 0.003% THD...and more with 1 percent - uses 55 volts DC supplies (symetrical)
Input sensitivity is 750 milivolts to drive the power amplifier to full undistorted power
Input impedance will depend the model.... Dx Blame ES, ST and MKII is 10K... the Supercharged is 47K
Audio bandwidth..from 5 hertz to 100 kilohertz, - 3dB normal curve
Power transformer to Dx Blame ES and ST is 25VAC plus 25VAC and 180 watts (180 VA) transformer to each channel... filters are 15000 plus 15000uf to each channel.
Power transformer to the Dx Blame MKII is 25VAC plus 25 VAC and 350 watts (350 VA) to each channel... DC voltage after rectification and filtering will be around 35 volts
Power transformer to Dx Blame MKII, operating with 35 volts is a 40VAC plud 40 VAC and 350 watts (350 VA) power transformer to each channel... DC voltage after rectification and filtering will be around 55 volts DC plus 55 volts DC (positive and negative naturally)
Fuses to the rails, Dx Blame ES and Dx Blame ST is 2.5A to each rail and 5A fuse in series with the speaker terminal (speaker protection or use a protector board having relays and delayed insertion and off set (DC) sensor)
Fuse to rails, Dx Blame MKII is 4A to each rail and 8 amperes to the output.... in series with the speaker as protection if you do not use protector circuit board.
Fuse to rails, Dx Blame MKII Supercharged.... 4 amperes each rail and 8 amperes to the output
Attention.... this amplifier is using ONLY two output pairs..but they MUST be the transistor model suggested because huge.... these amplifiers can produce much more power than specified, but having distortions... to avoid power output transistors damage, i have used limited power to the transformers...so..transformers is what limits the power... do not increase transformer power, or you will have transistor damage... also higher power...but will have troubles....to avoid reduce audio quality, VI limiters where not used..so... transistors are not protected and calculated to work fine with the transformer power suggested..if you install 1000 watts transformer you will have more power and will have also output transistor damaged..
Dx Blame ES and ST does not work with 2 ohms loads
Dx Blame MKII can operate with 3 ohms loads, but cannot operate with 2 ohms loads
Dx Blame MKII Supercharged will operate with 8 and 4 ohms only.
You should use star ground... or central ground.... so, capture the center tap wire from your power transformer (s) and solder, or fix it to your metalic case, your chassis.... this is the point to supply ground, power amplifier ground and speaker ground.
The power amplifiers uses lifted ground, or low noise ground (10 ohms resistance).. and this should not be connected to the star ground.... so, your input plugs must have the ground insulated (not connected electrically) to the metalic chassis.
It is suggested to you two transformers, or two supplies, with two separated rectifiers and bank of filters (electrolitic condensers) to each channel to increase separation and to obtain better sound stage.
A kit was offered in the past, for Brazil only, the green boards, and that kit included Surge protection board... 2 boards as Protector boards, speaker protectors... one board to each channel, having a lot of transistors and a relay.... that protector board senses the off set or DC in the output and switches the speaker off if we have a failure in the amplifier..this way avoiding rail DC to go the the output speaker connectors...also provide a delayed insertion to amplifiers that produces noises during power on (not the Dx Blame case...this amplifier has silent power on)... also the kit had two power supply boards and two power amplifier boards.
Another kit, the Supercharged blue boards kit had only protectors, power amplifier and supply.... and that power supply have not rectifier...it is to use external industrial bridge rectifiers because the huge current this amplifier can suck from the supply...so... the supply used only condensers, resistances and capacitors.
There's a video in the youtube explaining how to adjust this amplifier...video in Portuguese and in English too...there's several videos about other details and video explaining how this amplifier works...also a lot of other videos showing it playing and some sllide movies showing pictures and the sonics of this amplfiier...with audio captured using microphone....just type " destroyersoueu " in the Youtube search bar and you will have all these videos and much more.
The kinghost shows boards in details, schematics, adjustments, charts and all needed information to someone to assemble, to etch their own boards in their own home if they want to do this way..also Greg site.
You should read if you are interested..all informations where posted and written for you...you do not need to ask things..just read and i do think you will not need to ask anything more..as i have worked hard to keep all informations opened to whole world.
regards,
Carlos