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Stormrider 8th February 2009 11:18 PM

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?

Here is the datasheet :

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...

Stormrider 9th February 2009 03:44 AM

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?

Conrad Hoffman 9th February 2009 05:58 AM

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.

bosedtobosed 9th February 2009 06:09 AM

sell them on ebay would be a option

Stormrider 9th February 2009 01:48 PM

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.

poynton 9th February 2009 01:58 PM

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. )


mjf 9th February 2009 02:35 PM

2 Attachment(s)
hello all to you.
found an old schematic in a catalog of 1977 .they used the 2n3054 for a small power amp...............

Stormrider 9th February 2009 02:47 PM

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.

wg_ski 9th February 2009 04:59 PM

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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