soldering matched trannies

[modlar at gmx.net]

Hi all !

I'm just building the Formant Pro Moog ladder filter. Of course,
I measured the transistors. After putting those together who match
(and happy, that I found enough, which match (10 of 80 !)) I thought
by myself : 
Could soldering change the transistors behavior (for longer, not only
by changing the temperature for some minutes)?  
I tried it out, by holding the solfering iron 10, then 20 then 30
seconds on the "legs" of one of the transistors. The value did absolutely
not change !!! (After cooling down, of course).
Now my question : Is it theoretically possible without destroying
the transistor to warm it up by soldering in a way, that changes 
the electrical behaviour ? (Hope you understand, what I mean, with my
germinglish.)

BTW : The Formant pro - book is, beneath what Juergen told us,
full of construction errors. Nothing fits together. 
Not the cabinet to the faceplates, nor the faceplates to some of
the boards. Grrr !
And the schems don't fit to the Component lists (some of R's and
C's are not on the schems, some are wrong) and so on and so on.
Looks, like if someone was in hurry....
But nevertheless, many PCB layouts of some very useful modules.

J.S.
Happy 1st advent

-- 
Sent through GMX FreeMail - http://www.gmx.net