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Everybody counterfeits everything. Anything that sells for 3 cents a piece in bags of 100 is fair game for counterfeiting. The crooks pump this stuff out by the millions, and make their nut by

It may fix some of the U800s that have failed: http://tech.groups.yahoo.com/group/TekScopes/message/83240 Please search this forum: "U800 baking" This has been discussed ad nauseam. --Victor

Has someone actually counterfeited 2N3904s? How desperate did they have to be?

I am not sure why Tektronix listed the 2N918 as a replacement for the 2N3605 and I even went back and confirmed the specifications. My guess is that it had something to do with storage time,

I hope they're not counterfeit .... You should test a few to see where Ft seems to be. 73 Jim N6ITQ

Removing the heat from the plastic should in turn drop the temperature of the metal fin some. Now does that produce undesirable thermal shifts, no idea. In my case I'm pulling heat from a little of

Last time 'round on this topic I designed a heatsink that contacts only the metal tab parts of U800, not the plastic body. This is the intended (I think) means of getting the heat out of the chip. The

Well, I just ordered a bag of 100 2N3904's for $4. Hopefully all goes well B

33 PN918's @ 0.33 each would be only 11 bucks, so why again would one substitute if an exact/jelly bean brother (PN918) part is available? Far too many times have I seen someone chase down a problem

The 112 is ok for the 110 measurement. Resistance measurements depend on several variables including lead polarity, meter type, and active device junction variables. You need to make a dc voltage

The price would add up fast if he was looking to replace all 33 of the 2N3605/2N918 transistors in his 184. Most of the other small signal NPN transistors could be replaced as well. Jelly bean parts

OP was looking for a more available part - not a jelly bean part, whatever that is. If the original is still available, why the subs? And no, most of us buy our parts in onesie-twosie fashion. What

Under $2 is not cheap for a jelly bean part. 2N3904 transistors are like 3.4 cents each. Even an MPSH11 which is a closer match to the 2N918 can be had for 8 cents each. Note that the above prices are

For those interested in the fixes I found for my 2247A where channel A sweep would not visibly function and the unit would not work at all? ????? What I found was two pins bent under on two

Thanks for the replies. I picked up two of these at the same time. Both work but both had transistors removed. I was looking for what were the most available parts for me that would work. Thanks for

Er, make that "two" places, and that doesn't include evilbay.... Cheers, Taylor Why all the subs? 2n918's are still very available, and at least tow places have them under $2 each. Hard to rationalize

Why all the subs?? 2n918's are still very available, and at least tow places have them under $2 each.?? Hard to rationalize subbing an available, cheapo transistor. ? Cheers, Taylor

No, not really. The 2N2222 has a higher power rating than the others and the 2N4401 has a higher current rating than the 2N3904 but none of that will matter in this application. As far as performance,

I don't know shy this has not been mentioned but the 475M is the same as the 475A with some mechanical differences. If you want to compare the 475M to the 475, use the 475A. This is quoted from the

That was my typo on the 2N918. Of the 3 you list is one offer any better performance? 2N2222, 2N3904, and 2N4401 Thanks