Destroyer x Amplifier...Dx amp...my amplifier

[destroyer X]

See the gain measured.

regards,

Carlos

[destroyer X]

And because of that i installed them to test.

regards,

Carlos

[destroyer X]

Sound still absoluttelly the same...the same sonics....no advantage...the opposite...if you put your finger in the input..even the power unit beeing plugged into my sistem... having ground and sligtly reduced sensitivity..i could capture noises from Medical instruments i have 200 feet long.

No need to adjust bias, not need to re-adjust off set.

The amplifier sounded the same...and this time, all transistors used are high speed...since the first ones to the output ones.

The VAS used is 2SC4793

.................................................. ................................................

This was made to show you...as i already know those things, because even not beeing too much intelligent..but having 46 years doing those things...i had that knowledge in the real practice world.

You can use other transistors than the ones suggested by any schematic....and do not spect to have too much disadvantages if you could find a good gain replacement ones (differential and VAS)...if you could find a good one related the power dissipation needs...if you could find someone that can work under the voltage (DC and AC) you will need...well.... substituting with some criteria..with some care of course.

No magic transistors people!....no Celestial junctions....they all track the audio and transfer current to the next stage.w

You have your junk box...try to imagine how many amplifier can come from those dusty parts?.... just block those ideas that transistor have to be "that one!"

I still prefer those TIP41 and TIP42...they do not picked Radio frequencies...they do not turn hot alike those plastic ones that have not a good heat transference to the air (no guys!..they are not oscilating...i have checked guys)... and they are cheap.

regards,

Carlos

[destroyer X]

This test was done for you...those ones use to read those things i use to write here...thank you by your attention.

I have to construct circuits for friends...i told them 10 days...hehe...in a matter of 5 all them will have a good surprise.

regards,

Carlos

[destroyer X]

But i am still waiting for transformers, heatsinks, condensers, output units and many other things.

They will construct the case and realise the internal construction.

I will use my supply and transistors only to test and adjust.

regards,

Carlos

[lineup]

Originally posted by destroyer X

This test was done for you...those ones use to read those things i use to write here...thank you by your attention.
I have to construct circuits for friends...i told them 10 days...hehe...in a matter of 5 all them will have a good surprise.
regards,Carlos

That 2SA1216 Heatsink reminds a bit of lineup homemade sinks

See attachment!

to the left .... 1 mm Aluminium for one TO220
the big one .... 2 mm Aluminium for TO3, as can be seen
.... or higher power TO220

Regards, lineup

[destroyer X]

But the matchbox, with the walking little boy was a must!

regards,

Carlos

[destroyer X]

I bougth it near my home...something alike "garage sale" we have here

I do not remember very well, but i think 6 or 8 of those beauties were inside the case.

One was burned and i have destroyed another one because the metal contact, under the transistor, were warped...alike a bowl, not flat having a good metal to metal contact...this way dissipation turn bad and the unit gone...sadly gone!

Now a days i use to sand them over a flat surface, alike a glass plate...using black sandpapper from Norton, grain 500 waterproof sandpaper, that one to use with watter....during the sand work you see clearly that behind those transistors are not flat...or....they turn warped with the use, heat, time and mechanic tensions because screws very tigth and close one related the other.

I do not think those ones i got are fake...they seemed to me that were never soldered...solder was the factory one...and the Pioneer enclosure screws told me, because of noise when opening, that they were never opened....so..unless Pioneer was using fake ones, those ones must be real Sanken ones....

this PNP one was making a pair that was holding a higher voltage to the output...class H amplifier i think...hardly burned and melted inside...i did not tried to fix it...smelling too much...boards with holes in the middle, burned because shorts that had fire too.

Almost undestructible those transistors..hard to kill wonder those transistors...Jacco Vermeullen has many of them...i think he use to kiss them everyday...ahahahahaha

regards,

Carlos

[lineup]

Originally posted by destroyer X

2SA1216 and 2SC2922
Almost undestructible those transistors..hard to kill wonder those transistors...Jacco Vermeullen has many of them...i think he use to kiss them everyday...ahahahahaha

regards, Carlos

One DIY-audio member sells those SANKEN Audio Power transistors

They are extremely good, in all ways
- can take much power
- are very fast, in relation to power handled
- and take much heat!

What question I have Carlos is:
how to find suitable heat insulators bricks...
TO-3 or TO-247 will be way to small!

Fair and correct Prices, I think
at:
High POWER SANKEN Audio devices!
.... he even sells Complementary Matched Pairs!



Lineup Audio Lab

[destroyer X]

Those ones will be something alike 2N3055...they will be alive in our minds for many years.

I use to construct mine ones with thermicall tissue...that rubber material...also you can use two thin insulators, the ones you use with 2SC5200...joined in the center and cutted with a scissor.

regards,

Carlos