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Old 25th March 2003, 05:26 PM   #1
Ford_V6 is offline Ford_V6  Romania
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Default 2n3055

Hy

Waht amp can be built with 2N3055 transistors ? Here in romania they are extremly cheap. About 0.3 $
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Old 25th March 2003, 06:20 PM   #2
Jeff R is offline Jeff R  United States
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The 2N3055 is an old, rather generic transistor. Many amps can use it - just keep them within their voltage and current (and power) specifications.
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Old 25th March 2003, 06:36 PM   #3
paulb is offline paulb  Canada
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Two designs that come to mind. Both recommend upgrading from 2N3055s to get better sound.

ESP P3A at www.sound.au.com

JLH Class A at www.gmweb.btinternet.co.uk
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Old 26th March 2003, 05:40 AM   #4
argo is offline argo  Estonia
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Quote:
Originally posted by paulb
Two designs that come to mind. Both recommend upgrading from 2N3055s to get better sound.

ESP P3A at www.sound.au.com

JLH Class A at www.gmweb.btinternet.co.uk

There are 2N3055-s and 2N3055-s. Depends from manufacturer IMO. Older original Motorola devices tend to sound much better than STmicrodynamics current production. ST had more inferior sound compared to Motoralas in my JLH Class A amp. MJ15003 is said to be far better than 2N3055 though.
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Old 26th March 2003, 07:09 AM   #5
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Default Re: 2n3055

Quote:
Originally posted by Ford_V6
Waht amp can be built with 2N3055 transistors ? Here in romania they are extremly cheap. About 0.3 $
Mr Car, I think you should start in the other end. Which output transistors can I efford? The big cost is case (maybe), smoothing caps (maybe) transformers (maybe).

I think to start with "this is really cheap", is not right if you look at the whole concept. Why put much work into an amp with crappy output transistors?
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Old 26th March 2003, 12:03 PM   #6
Ford_V6 is offline Ford_V6  Romania
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I was just asking, i'am not planing to use them.
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Old 29th March 2003, 09:21 AM   #7
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Old 29th March 2003, 10:57 PM   #8
djk is offline djk
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"Why put much work into an amp with crappy output transistors?"

While I agree with this in principle, I'd like to make a couple of points.

One of the best amplifiers I have ever heard is an all NPN design using outputs with an Ft of only 0.8Mhz, design does have something to do with the sound too.

Here is a design that can use 3055s and put out 100W/8R, notice that with a couple of small changes it could be an X amp feedback arrangement.

http://home.kimo.com.tw/skychutw/Circuits/Hadley622.pdf
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Old 29th March 2003, 11:15 PM   #9
Diode is offline Diode  United States
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3055's may not be suited for output transistors but make very good powersupply pass transistors for a high current regulated supply! If you are going to regulate your supply, use the 3055's unless a huge voltage will be used!!!! If maybe a friend gave you a bag of them for free and you want to use them, match them very closely. They will work. I'd use them in a subwoofer amp if so.....

Good luck.
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Old 30th March 2003, 10:28 AM   #10
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Default 3055s

Hi,

I've used 3055s since they are also cheap here in my country. Though sound is not a case when I used them. All I need was power and lots of power so I used a bunch of them.

I'll try posting the schematic asap.

JojoD
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