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Old 5th June 2013, 02:04 PM   #811
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Old 8th June 2013, 09:15 AM   #812
krojo is offline krojo  Poland
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Can I use C4468 and A1695 ?
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Old 10th June 2013, 10:58 AM   #813
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Default These transistors are not that huge

They are very good....but the power dissipation derated is not that good..also the maximum continuous current is not that big too..

It can be used, sound will be excellent, no doubts, but you will not be able to connect 2 ohms loads anyway neither 4 ohms speakers that have valleys of impedance lower than 4 ohms (almost all them have these lower impedance frequencies...so...all them are very dangerous)

So..... not completely or entirelly guaranteed at 4 ohms.... where power is 150 watts RMS each channel... some care will be needed.... not to push it too much hard for too much long time.

Better is not to use 42 volts....better to go down to 40, or 38 volts or even 36 volts aproximately....or to install another pair in the output.

You see this is because of 70 degrées centigrades..the worst case scenario of bad heatsinks, bad flan blower and bad installation inside the enclosure with bad vent holes and all bad stuff joining together to produce a big trouble.

Of course, to operate 8 ohms it is very safe and the power amplifier can reach, easy, 80 watts RMS with low distortion when feeded by 42 volts supplies.

30 plus 30 volts alternated and 550 to 600 watts or 600 VA transformer will be good to feed two channels of these amplifier to operate 4 ohms full rated power.

Good luck!

regards,

Carlos
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Old 11th June 2013, 11:53 AM   #814
AndrewT is offline AndrewT  Scotland
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post813 shows the de-rating and how to determine a maximum operating dissipation for driving a resistor load.
Driving a speaker, that is a reactive load, is very much more stressful.

A 2pair output stage using 100W devices can do 150W into 4r0 resistor, but it will not be reliable working at near maximum powers into a 4ohms speaker, if the devices get hot.
The de-rating for a reactive load can be either using 8ohms speaker, or domestic listening into a 4ohms speaker, where the average power output is ~20dB below max power.
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Old 14th June 2013, 10:49 PM   #815
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Hello Carlos!

I finally met all the elements of my amp and assembly has begun.
The heat sinks, the Sanken and two transformers were stored for over twenty years and are now used to this amp.
Here are some pictures from the beginning and as soon as I finished all the amp I am sending others.

Thank you for this achievement!
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Old 15th June 2013, 09:47 AM   #816
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Default Very nice.... thanks a lot by the pictures

It is looking great!

regards,

Carlos
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Old 15th June 2013, 02:33 PM   #817
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oh jo joy !!!!! looking good mister Project16 surely looks really good, Sanken classic

Regards
Vargas
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Old 15th June 2013, 03:54 PM   #818
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Default I have just received my kits of parts and pcboards

To assemble a stereo Dx Super A (Brazilian white pcboard) and a Dx Supply.

regards,

Carlos
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Old 15th June 2013, 04:16 PM   #819
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Default Boards and parts arrived to build a Dx Super A

Here you have some pictures.

We are NOT offering to the international community due to the lack of confidence we have related Brazilian Postal System...in other words..we cannot guarantee the package will arrive your place...if you want to take the risk by yourself..then go to Zimmer:

imap.eletro@gmail.com

regards,

Carlos
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Old 15th June 2013, 05:09 PM   #820
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Default Brazilian group buy pcboards arrived at my home

Here you have them:

Placas para Dx Super A chegaram - YouTube

Carlos
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