Re: Replacing Tektronix 465 range bulb

Boris Mohar <borism_-void-_@xxxxxxxxxxxx> wrote in
news:1e1ib3pv0ov1q3p92po0jv68g0v8095msc@xxxxxxx:

On 7 Aug 2007 14:10:57 GMT, Jim Yanik <jyanik@xxxxxxxxx> wrote:

Boris Mohar <borism_-void-_@xxxxxxxxxxxx> wrote in
news:3qdfb31vda6cghkl7deddsibgo320ep8nb@xxxxxxx:


Hello,

The range bulb(s) 1x/10x (ch1) appears to be burned out. It looks
like it is well buried under the switch. How much pain is it
replace it and where can I get one. I might be tempted to replace
it with LED and a resistor if I can get to it. Is that one bulb
that has its light output steered or are there two? None of the
pertinent positions on that channel light up.


you have to remove the vertical preamp board and attenuators to access
those TWO lamps,a PITA. I definitely would consider LEDs and resistor
in place of the lamps.I think you could get away with one resistor for
both LEDs.

the original lamps had 50K hour lifetimes.

I think that you talked me out of it. Thanks.

I got pretty good at it while at TEK.
I got to know what screws and shields to remove,and had a flex nutdriver
for the nuts bolting the attenuator frame to the front casting.
Of course,I didn't have the option of skipping the job... 8-)


BTW I just finished repairing the 307 modules.
http://www.sphere.bc.ca/test/tek-parts/tekpots.html
At first I thought that it was the socket but it turned out that the
pins become intermittent at the ceramic substrate solder junction. The
gain and the frequency response was all over the place. I unplugged
them, removed the lids and resoldered the pins from inside. I used
some rather aggressive water soluble flux because rosin flux just
would not work wit those pins. Washed them out with lots of water. It
is rock steady now.

--
Boris


Amazing that you could solder them at all,the plating/tinning on those
ceramic substrates always seemed to vaporize under soldering heat.
did you use ordinary solder,63/37?


--
Jim Yanik
jyanik
at
kua.net
.

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