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2n6487 for 1692


Posted on Monday, June 06, 2005 - 01:41 pm:   

i've read on here that the 2n6488 is a good substitute for the 1692's. the data sheet says that the 2n6487 is a complimentory type for the 2n6488. they seem to be a little different...
would these work just as well in my 112rd 100?
Steve Kennedy (admin)
Posted on Tuesday, June 07, 2005 - 03:12 pm:   

The 2N6487 is the COMPLEMENT to the 2N6488. This means that one is PNP and the other is NPN (exact opposites of each other).

You do NOT want to use the complementary part but the original part (2N6488).


Posted on Wednesday, June 08, 2005 - 02:22 am:   

thats what that means... thank you.
Steve Kennedy (admin)
Posted on Saturday, June 11, 2005 - 10:21 pm:   

The reason that they are "Complementary" is that you use one of each (or more) to form a push-pull pair that works as a unit.

Posted on Thursday, July 21, 2005 - 11:51 pm:   

help. regarding my 112 RD fifty. my tech replaced my JE1692 transistors with NTE379 transistors. my amp doesn't sound quite right. AND i have no eq. on both channels both the bass and treble knobs do almost nothing to the tone. any advice appreciated. please email with suggestions. thank you in advance. greg
Mike H
Posted on Friday, July 22, 2005 - 09:33 am:   

I've been spending a lot of time with my amp on the bench recently. In fact, I have tried several driver transistors, gotten input from people on this site, and read -- I think -- every post on this site about them! Anyway, what I have discovered is that most people found that the NTE transistors don't work very well in this application. So, I didn't try them. The guy at my local store said it's probably because NTE typically makes a cross-reference part to suit many needs which leaves it lacking in some way. I have found that 2N6488 & 2N6292 transistors work well. However, the 2N6292 that I have used are not real consistant from one to another which results in carrying different current and voltage. Hope this helps.
RD112's picture

Motorola 2N6488 repalcement for JE1692 Success!

Hi all,
I just got my RD112 100 back from the shop, where I had it in to replace the JE1692's with Motorola 2N6488.

I also replaced the stock Philips 6L6GC tubes with new Tungsol 6L6GC-STR, and bias adjustment.

So far I am happy with the overall performance. The amp seems to have less of the annoying hiss that was present previously. Not sure it the improvement is the tubes of the transistors.., but I am happy with the result.

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