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, economics,
pinout, or a mistake.
The worst case problem I can think of is that the 2N3904 transistors
oscillate due to higher current gain in some cases but I would
consider that very unlikely if Tektronix was recommending the much
faster 2N918 as a replacement. If it does happen, those little
ferrite RFI suppression beads would fix it. I had to use them when I
replaced relatively slow 2N3565s with 2N3904s in my DC505. The
2N3565s were dying of age.
On Mon, 21 Jan 2013 01:04:11 -0000, "andersen_bill@..."
<andersen_bill@...> wrote:
Well, I just ordered a bag of 100 2N3904's for $4.
Hopefully all goes well
B
--- In TekScopes@..., "andersen_bill@..." wrote:
I am repairing a 184 that has had transistors removed from the countdown board.
I am looking at;
Q104
Q114
Q134
SM says "selected from 2N3251"
I can get 2N3251A's local.
I looked at the data sheets. Specs are close. Looks like the A has higher ratings.
Does anyone know if they will work or do I need the non A part?
TIA
B
David Hess