transistor amp not working after shorting output

[sg97]

in hour or two i will start measuring transistors and put all values i get in one drawing so you guys can check it . btw i tested meter measuring a diode and it works.

 

[sg97]

this is what i got. i think second transistor is dead

 

[gijser]

I think you should check at least the two driver transistors too.

 

[Wakh]

Все 6 транзисторов нужно проверить.
На 2Н3055 должно быть как на рисунке.
На остальных транзисторах вы узнаете, где находится база и тип транзистора p-n-p или n-p-n.
Для металлических транзисторов корпусом обычно является коллектор.

 

[sg97]

here are small ones. i did all i could i think that i measured everything right. so its up to you guys to tell me now if some of them are dead also

 

[sg97]

All 6 transistors need to be checked.
On 2N055 it should be as in the figure.
On the remaining transistors, you will find out where the base is and the type of transistor p-n-p or n-p-n.
For metal transistors, the housing is usually the collector.

View attachment 1254189

picture of the meter is from internet i have same one but its not mine that i took a pic xdd

 

[sg97]

those are measurements i did, so main thing is i dont know what are usual values. so if someone knows then this should be good indicator

 

[Wakh]

On the multimeter you need to set the mode to measure diode and not resistance.

 

[sg97]

i never did that xdd of course its on diode mode

 

[sg97]

i made few errors i think this one is good

 

[sg97]

this is more clean

 

[sg97]

i did all the measurements so if someone can cleary say what should i replace that would be cool. because i am not sure.

 

[Wakh]

We can confidently say that transistor 1 is suitable

 

[sg97]

so you suggest that 2 and 3 should be replaced ? btw i dont know how to find base i only know what metal cap is collector thats all

 

[sg97]

btw i did not draw 6 transistor only 3 xdd same 3 two times ones with red probe on collector and same but reversed with black on the collector.

 

[sg97]

i mean on the cap maybe not all have collector on cap but you get the idea

 

[indianajo]

In post 142, measurements from the right pin (emitter) looking from the long end to case C is not interesting unless zero. You did not measure from left pin (base) to case (c) on the lower measurement. In niether upper or lower 2n3055 measurement did you show the number backwards, minus to base + to collector, minus to base + to emitter.

 

[sg97]

if there is not measurement it did not show on meter so thats why

 

[sg97]

this is what i got you can see where i put + and - probes

 

[sg97]

my original drawing on paper it is messy but i hope this explains better