2n3055 amp claims 200 to 220 watt - diyAudio
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Old 17th May 2011, 11:42 AM   #1
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Default 2n3055 amp claims 200 to 220 watt

amplificador-220W.jpg

Here is A amplifier with 2n3055 transistors on its output for those of you that are looking at doing a bang for buck amplifier with all those 2n3055 lieing around that as most electronics guys think when they look in there junkbox there must be something i can do with this stuff?????? Well I really don't know for sure if this amp schematic is able to do what is says but even if it comes close thats one way to make use of of those 2n3055's lieing around for a pa type amp even. Can anyone have a look at this schematic and see if it is actually capable of producing what it claims???? I would appreciate it my maths says it would produce around 150 watts but iam not 100% sure. I would like another eye on it. It just looked like a good bang for buck amp. Thanks
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Old 17th May 2011, 11:52 AM   #2
sreten is offline sreten  United Kingdom
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Hi,

It has enough output transistors (with adequate heatsinking) and enough
rail voltage to be able to drive around 200 watts into around 3 to 4 ohms.
The "output protection" looks very dubious to me, being driver based.

rgds, sreten.
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Old 17th May 2011, 12:21 PM   #3
sajti is offline sajti  Hungary
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I don't really recommend this design. THe 2N3055H (H is important!!!) can handle 100V Vce. And +/-55V is a little bit overkill for this.
I saw 250W amplifier with 2N3055, but it was bridged, and gives 250W/4ohms, with 6pairs of them.

Sajti
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Old 17th May 2011, 12:24 PM   #4
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with quality parts and rowbust power supply is very possible .... bryston i think had similar circuit but may be i am wrong ..
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Old 17th May 2011, 12:45 PM   #5
AJT is offline AJT  Philippines
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the 2N3055 is good for rails up to +/-32volts.....i do not see how it can run safely at rails of +/-55volts.....
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Old 17th May 2011, 12:55 PM   #6
wahab is offline wahab  Algeria
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The choice of all transistors used is awfull...

Differential pair use non adequate transistors,
the VAS use a low frequency tranny overvoltaged ,
while the output stage use old, slow and overvoltaged ones..
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Old 17th May 2011, 12:55 PM   #7
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Quote:
Originally Posted by seedseed View Post
Attachment 223235

Here is A amplifier with 2n3055 transistors on its output for those of you that are looking at doing a bang for buck amplifier with all those 2n3055 lieing around that as most electronics guys think when they look in there junkbox there must be something i can do with this stuff?????? Well I really don't know for sure if this amp schematic is able to do what is says but even if it comes close thats one way to make use of of those 2n3055's lieing around for a pa type amp even. Can anyone have a look at this schematic and see if it is actually capable of producing what it claims???? I would appreciate it my maths says it would produce around 150 watts but iam not 100% sure. I would like another eye on it. It just looked like a good bang for buck amp. Thanks


Sweet!
That is what I like cheap simple high power design that does not use exotic parts.
I am sure it will do that kind of power as My sunn concert slave does 180 watts on just 4 of them and 120 watts clean. jer
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Old 17th May 2011, 01:03 PM   #8
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That would be a great heavy duty amp if one where to use 2N3773's in the output stage and in a BTL configuration. jer
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Old 17th May 2011, 01:05 PM   #9
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There are lots of shiny (and dull aluminum) things called 2N3055. Some can take 55 volt rails but many can not. I bought a big box full of military surplus RCA transistors back in 1970. I still have some. The label on the box had a house number, a FSN (federal stock number) and writing that said similar to 2N3055 (no H).

The amplifiers that I made back then were crude totem pole designs with no protection circuits. They were used as guitar amps where the main design criteria was to be louder than the other guy. Some even ran directly from rectified line voltage.

Many of them blew up over time but as of the early 90's (last time I saw the guys) two of the big ones were still going. One used 8 of the mystery 2N3055's to make 300 watts into 4 ohms. The really big one used 24 of the mystery transistors to make a measured 1200 watts into a 2 ohm load. The guys were using it as a PA amp for outdoor rock concerts. I saw it used with about 6 speaker cabinets connected up to it (individual impedances unknown).

Assuming that the "2N3055" used can handle the voltage. 200 watts from 55 volt rails is possible. It only takes one transistor avalanche to blow them all up!
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Old 17th May 2011, 01:10 PM   #10
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I used to love it when I blew up my old sunn concert because I could truck right on over to radio shack and rebiuld it for $10 and it had gobs of power and smoked my 610 cabinet lots of times(he,he,he) jer
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