Transistor question

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bayoucables
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Transistor question

Post by bayoucables » Tue Mar 14, 2006 12:20 pm

Can anyone help me with a replacement transistor for an Altec input preamp?
The original number is AL2712. According to one source, A means germanium and L means transistor, high frequency power. There are sever 2712 transistors available, I'm trying to find out what would be the proper replacement. The power supply voltage of these preamps is from 12-20 volts.
Thanks.
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janusmusic
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Post by janusmusic » Thu Mar 16, 2006 10:30 am

I thought AL was for aluminum/silicon. Could be wrong though.check the NTE cross reference. Just type in 2712 sometime prefixes will throw it off..is it a standard 3pin transistor? look like a tophat?
here is nte's link if you haven't tried already?
http://nte01.nteinc.com/nte/NTExRefSemi ... h?OpenForm
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RodC
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Post by RodC » Thu Mar 16, 2006 10:50 am

janusmusic wrote:I thought AL was for aluminum/silicon. Could be wrong though.check the NTE cross reference. Just type in 2712 sometime prefixes will throw it off..is it a standard 3pin transistor? look like a tophat?
here is nte's link if you haven't tried already?
http://nte01.nteinc.com/nte/NTExRefSemi ... h?OpenForm
brian
NTEs are OK but they are "generic" replacements, meaning close enough. I hope you can find the original NOS somwhere.
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RodC
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Post by RodC » Thu Mar 16, 2006 10:52 am

These guys have them, not sure if you have to buy in bulk:

http://www.4starelectronics.com/index.html
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bayoucables
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Post by bayoucables » Thu Mar 16, 2006 10:54 am

Since I posted this, I found the NTE cross reference. There is a low noise version that ends with 850. The original is the standard 3 legged transistor. The new replacements seem to all be flat IC style.
Thanks.
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ciminosound
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Post by ciminosound » Fri Mar 17, 2006 12:15 pm

Here's a handy Altec Transistor Replacement guide if you haven't found it yet. Can be VERY handy.

TL_175A.pdf
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ciminosound
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Post by ciminosound » Fri Mar 17, 2006 12:33 pm

Appears to be a 2N2712. Silicon NPN selected for Beta range and color coded. NTE85. Depending on the Beta range you can also sub 2N3392,3393,3394. Nte199 may also sub, specified low noise 3392.

Appears to be standard 3 leg and not SM flat pak.
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