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Old 8th February 2009, 11:18 PM   #1
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Default 2n3054?

I came across a metric ton of these (atleast 100)

As far as i can tell they are a TO66 version of the 2n3055. I'd like to do something with some of them and about all i can think of is a small, low rail voltage, low power, quasi-comp. Project 12 at ESP maybe?

http://sound.westhost.com/project12.htm

Here is the datasheet : http://www.datasheetcatalog.org/data...r6kou5763y.pdf

Yes, i know it will be far from high fidelity. My question is, what can i do with these? Besides throw them out - I already know i can do that...
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Old 9th February 2009, 03:44 AM   #2
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I found a ~200VA single secondary, 0 - 37VAC transformer i could use for an ESP P12A - EL Cheapo with these transistors... Would give a 50Vdc B+ and ~25W/8R. I don't have any low voltage CT transformers to use so i will have to use an output coupling cap.

I think it would take two pairs per channel of these 2N3054's to be on the safe side. I would modify the P12A to use the vbe multiplier bias control that Rod' suggests at the bottom of the page instead of diodes.

No comments? Better circuit to use?
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Old 9th February 2009, 05:58 AM   #3
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IMO, those are best used for pass devices in voltage regulators and non-audio circuits. Not a lot of speed and gain compared to preferred parts. I think the early solid state Dynaco amps used selected 2N3055s and they were pretty bad. Compare the data sheets- I remember that there were some differences- maybe the 3054 is a bit better.
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Old 9th February 2009, 06:09 AM   #4
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sell them on ebay would be a option
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Old 9th February 2009, 01:48 PM   #5
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They don't seem to be any faster than the 3055. 3Mhz at 10V/200mA compared to 3Mhz at 10V/500mA.

The point of this project is just to use some otherwise useless old parts i have laying around and make a somewhat formidable amp. I know it will be far from the modern amps i use, but plenty of people before me have enjoyed the 2N3055.

I am wondering if two pairs of these will be reliable at +50Vdc with an 8 ohm load. I don't seem to have the "A" version.
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Old 9th February 2009, 01:58 PM   #6
poynton is offline poynton  United Kingdom
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As far as I remember, the 2N3054 was used primarily as a driver transistor rather than for output purposes.

They were certainly not a TO66 version of the 2N3055 ( although the "A" version may well be. )

Andy
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Old 9th February 2009, 02:35 PM   #7
mjf is offline mjf  Austria
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hello all to you.
found an old schematic in a catalog of 1977 .they used the 2n3054 for a small power amp...............
greetings............
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Old 9th February 2009, 02:47 PM   #8
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That's more or less what i plan on doing, only with two pairs on a much bigger heatsink.

You may be right though Polynton, however i have seen these devices used in small recievers from the 70's, so i will see what happens.
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Old 9th February 2009, 04:59 PM   #9
wg_ski is offline wg_ski  United States
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I've seen plenty of TO-220 outputs (including TIP's) in small receivers back then, too. The TO-220 and the TO-66 are close themally. You don't see them anymore because anything that small uses just an IC these days.


2N3053 (1W) --> 2N3054 (25W) --> 2N3055 (115W).
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