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Electronics => Repair => Topic started by: Napalm2002 on September 30, 2014, 02:45:47 am

Title: transistor help please
Post by: Napalm2002 on September 30, 2014, 02:45:47 am
Hello all

I apologize for asking  such an easy question but I am working on an old akai receiver  aa-6600 and I need to replace a bunch of 2sc458 transistors. I had read somewhere  awhile ago that 2sc2240 was a suitable replacement. So I bought a bunch very cheap and started to replace them. Then I had printed out a data sheet and I saw that the specs are quite different.  Now I am far from an EE so if some of you guys could tell me if you thinks that the 2sc2240 is a close enough  replacement or do I need to buy another part no.

Thanks

Mike M
Title: Re: transistor help please
Post by: T3sl4co1l on September 30, 2014, 02:54:24 am
At a very good guess, absolutely any crap will work.  2SC945, 2SC1815, PN2222...

2SC2240, specifically the GR grade will be a closer fit, but yeah, I doubt it matters at all.

Tim
Title: Re: transistor help please
Post by: liquibyte on September 30, 2014, 02:56:55 am
Someone else will probably answer your question better than this but I wanted to throw this site out there for you:  http://alltransistors.com/ (http://alltransistors.com/)

It helps to narrow down replacements and substitutions but I have to admit that I've only used it a couple of times.  It did work well for those times though.
Title: Re: transistor help please
Post by: kjn4685 on September 30, 2014, 03:30:24 am
I would Google it and get the datasheets then compare.
Title: Re: transistor help please
Post by: Napalm2002 on September 30, 2014, 04:37:53 pm
I did do that I just do t know how important the specs are and don't know what is ok and what might be too much.
Title: Re: transistor help please
Post by: vk6zgo on October 01, 2014, 04:53:38 am
At a very good guess, absolutely any crap will work.  2SC945, 2SC1815, PN2222...

2SC2240, specifically the GR grade will be a closer fit, but yeah, I doubt it matters at all.

Tim

Pretty much my attitude Tim--if it's got 3 legs you are halfway there! ;D

A tip for the OP---------manufacturers like to use the same transistor as much as possible,so if something does look critical,take a look around to see if they use the same device in a non-critical spot.

Steal that one,& replace it with a  2N22?,BC10? or whatever!
Title: Re: transistor help please
Post by: IconicPCB on October 01, 2014, 05:28:26 am
Try BC546 although 2sc2240 is also a good choice being a low noise audio device.
Title: Re: transistor help please
Post by: denelec on October 01, 2014, 10:25:22 pm
Why use the Internet when you can dig in old dusty reference guides?  ^-^

According to my Radio-Shack Semiconductor Reference Guide 1988 Edition:  >:D
The equivalent of 2SC458 is Radio-Shack transistor 276-2009.
http://www.radioshack.com/product/index.jsp?productId=2062608 (http://www.radioshack.com/product/index.jsp?productId=2062608)
It's a MPS2222A equivalent.