This is the DHR.... Dx High Resolution Turbo

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#566
Now with high power...the DHR Turbo

While i am waiting a new transformer that soon will arrive.

regards,

Carlos
 

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#569
he he he

dont know about you but personally i feel very privilged and lucky since i ve been repairing one third of these devices at least once in my life ....

most of them still working like hell

a quadraphonic pioneer qx949 with a scope ...done it arround 1995 ...still working fine

nice uncle charly !!!! you bring sweet japanese memories to us
 
#571
 
#572
hi carlos

i wanted to make this amp,but my problem is the pcb.i was thinking of conventional type ie power transistors on one side.if any one have that kind of pcb.i have seen pcb in the thread but none was complete they had errors or no pcb pdf.i like this one too but again it had errors
and not complete.


thanks ravs




be a vegeterian.
 

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#573
The board we have is this one Alexandru has made

and i believe, may not have errors as he have assembled and tested, as usually we do each board is offered into the forum.

I cannot help you...i do not know how to make boards... i do not have boards.

All boards you see in Dx threads were offered, kindly, by cooperative friends...i do my own boards my way, but this works fine only to myself.

Try to make boards your way.... keep lines short, keep distance from line to line, do not install input near the output and everything gonna be all rigth...the resting worries are based in myths, almost all them.

regards,

Carlos
 
#577
I do not remember if a board having all those transistors (alike the schematic)

was made.

I have made a circuit, a home made, my ugly style, using several transistors, but a lot of them were working alike diodes...base to emitter were used as diodes to help into thermal compensation.

The DHR Turbo was made to produce power, the main idea was not low distortion or awsome audio reproduction..it was made for power.... high power for long time.... something heavy duty, ... even the drivers i have used power transistors into my own construction and i think i have suggested that.

Maybe, because of that picture, you are expecting to find a board with all those transistors into the output.

You can make a cut into the board provided and to make an insertion using another printed sheet of paper, this way you gonna have 6 pairs, 12 pairs or the number of pairs you want..it is only a matter to increase the output transistors...drivers already has enougth current to drive all of them.

All currents into the DHR Turbo are in excess if i can remember, as the amplifier was published a long time ago...mine one is a customized unit that has some differences to match my transfomer, enclosure, heatsink and my own personnal needs and it is not standard.

I am afraid (if i can remember) that what you want does not exist (made and posted) and you will have to prepare by yourself.

regards,

Carlos
 
#578
ravslanka said:
hi carlos

i wanted to make this amp,but my problem is the pcb.i was thinking of conventional type ie power transistors on one side.if any one have that kind of pcb.
Click to expand...
A layout with the power transistors exiting from both sides demands a very tall heatsink.
The 5200s at the top will run hotter than the 1943s at the bottom.
 
#579
This is the old figth between what is correct to be made and what we want to make

I love that Alexandru (Alexmm) style to produce boards..but i know this is not good when we decide to install into an enclosure.

Takes a lot of space, we need a big flat surface when we have transistors both sides..for sure is something that looks good (to me, of course, personall taste about).. but use to be problematic when building into the enclosure.

I have asked my Orkut friends, to design their ideas about the bootstrapp amplifier i was teaching them to design...and one sent me his first amplifier as a gift....man!... what a trouble, monthes have passed and i have not find heatsinks and enclosure to fit those boards..the problem...transistors in both sides.

I also do not like transistors under the board..but they are helpfull to reduce size.

So..there are some problems, as i told you, between what is correct to be done and what WE WANT to do.

regards,

Carlos
An externally hosted image should be here but it was not working when we last tested it.
 
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