Re: Replacing Tektronix 465 range bulb

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.

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
.

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