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Old 26th January 2003, 10:41 AM   #1
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Question Amplifier based on 2N3055

Hello!
I need some good circuits (PCB) which based on 2N3055... How much power is possible to get with these?
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Old 26th January 2003, 10:57 AM   #2
dhaen is offline dhaen  Europe
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Hi,

This is a very old device. I used to use these for audio in the late 60's.
Although they appear to have a high Ptot, this is for a water cooled heatsink, and most samples available could never reach this even then.
There are some designs dating from the 70's that use them, including the Quad 303. (Or it used an equivalent).
One that I made at that time was this:

http://sound.westhost.com/jll_hood.htm

Not much power, but it sounded better than the Quad.

Unless you have a zero budget, I would suggest looking at some more modern devices.

Cheers,
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Old 26th January 2003, 01:29 PM   #3
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Default 2N3055

Hello macgyver

John Linsley-Hood’s 15W Class-A power amp which based on 2N3055
Hi, go to
http://www.gmweb.btinternet.co.uk/jlh1996.htm
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Old 26th January 2003, 01:39 PM   #4
halojoy is offline halojoy  Sweden
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Default Re: 2N3055

Quote:
Originally posted by nickgreek
Hello macgyver

John Linsley-Hood’s 15W Class-A power amp which based on 2N3055
Hi, go to
http://www.gmweb.btinternet.co.uk/jlh1996.htm
Here is a Thread about 2N3055 amplifier
with schematics.

2N3055 amplifier - thread

Have you Searched here
at diyaudio?

2N3055 is such a usual transistor, that very many amplifiers
have used this as Output devices.

/halo - now searching the web for some more - with PCB
################################################## #####
Here is the results, 12 hits
for search:
Google: "power amplifier" 2N3055 PCB schematics
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Old 26th January 2003, 03:45 PM   #5
ted is offline ted
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Another classic design based on the 2n3055 was the
Dynaco St-120. On a good day it could do 60 watts/ch
but usally about 55 watts/ch.

The sound is unique and is one of the simpliest designs of a
power amplifier.

The schematic/PCB is located at -
http://home.indy.net/~gregdunn/dynaco/components/ST120

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Old 26th January 2003, 05:13 PM   #6
halojoy is offline halojoy  Sweden
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Thumbs up A Good Old Dynaco ST120

Quote:
Originally posted by ted
Another classic design based on the 2n3055 was the
Dynaco St-120. On a good day it could do 60 watts/ch
but usally about 55 watts/ch.

The sound is unique and is one of the simpliest designs of a
power amplifier.
The schematic/PCB is located at -
http://home.indy.net/~gregdunn/dynaco/components/ST120
Thanks, ted

that was a Good Oldie Amp!
and simple and easy to build, too
################################################## ########

I recommend a visit at Ted's Website!

Ted's World of Power Amplification - Schematics & Schematics and ....

################################################## ########

I like that
/halo - has got one more schematic
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Old 26th January 2003, 08:49 PM   #7
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Thanks...
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Old 27th January 2003, 02:00 AM   #8
alvaius is offline alvaius  Canada
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Let's not remember the NAD 3020. It also used 2N3055s. If you heat sink them really well, you can probably get 40-50 watts in an AB output amp, maybe more. But you can find devices today that are more linear with higher BETA at high currents that will likely result in a better sound that is more tolerant of the overall topology.

Alvaius
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Old 27th January 2003, 03:40 AM   #9
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Mr. Elliott's DoZ makes 15w/ch Class A.
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Old 27th January 2003, 05:42 AM   #10
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Quote:
Another classic design based on the 2n3055 was the
Dynaco St-120. On a good day it could do 60 watts/ch
but usally about 55 watts/ch.
AFAIK, the ST-120 doesn't have a 3055 anywhere in it...

But the ST-80 does (40W/Ch).
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