Amplifier with 2N3055

Status
Not open for further replies.
Jump to Latest
#4
Tekko said:
... two 2N3055's ...
Click to expand...
So if you want stereo, it'll have to be single-ended class A.
Hehe - look Ma, only 30W dissipation for 2.5 watts output.
😛
 

Attachments

  • a.GIF
    a.GIF
    9.8 KB · Views: 534
#5
If i want to make a stereo version of this, i'll just get more 2N3055's, their dirt cheap.

This heatsink is way undersized anyways, its already HOT!! And this amp runs only 100mA bias.

I have in a box at my old adress a large heatsink with 8 TO3 devices on them, actually 2 but the other one is clean.
 
#6
Update:

The two 2N3055's have been replaced with four 2N3716 on a much bigger heatsink.

However making that work was a chore, it took me half a day and loosing a transformer to find out that one of the 2N3716's had a short from c to b.

However once that transistor was disconnected and replaced, the amp sprung to life.
 
#7
Tekko said:
Update:

However making that work was a chore, it took me half a day and loosing a transformer to find out that one of the 2N3716's had a short from c to b.
Click to expand...

Its worth fusing the secondaries to save the transformer if a short occurrs.

I have missed out the fuses myself before on a test rig,
Next thing I knew the transformer was bubbling due to a short !
Luckily i caught it just in time before the windings all melted together.
 
#8
In my case i dident notice it since the transformer was inside a plastic box down on the floor, when i heard the plastic bobbin bubbling and saw the smoke, it was already too late 🙁 Secondary had already developed interturn shorts.🙁
 
Status
Not open for further replies.
Top Bottom