Electronics Forum / Equipment / January 2006

I have produced 100's of I-t curve of a comb that is made up of copper e.g.
both anode and cathode is copper.
I have fixed the voltage to 1.25v, placed the copper combs in 18.3MR
(0.055uS) water and measured the current over 300sec (current is measure of

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I am repairing a 2213 scope for a friend. First it keep blowing fuses. I
trouble shot it to the diodes in the rectifier circuit (they shorted out). I
now get DC to the board for Hor & Vert detection. The problem now lies in
that the CRT will not light. So I need a service manual to ...

Is there a so called "Stolen Equipment Serial Number List" one can look up
on the internet before buying a piece of equipment from someone?
TIA

Have a large lot of Test Instruments available @ very good prices.
Spectrum & Network Analyzers, Scopes & plug-ins, Signal & Sweep
Generators, Power Supplies, Receivers , Meters etc,
Manufacturers include HP, Tektronix, Boonton, Fluke, Narda, Texscan.

I would be interested in hearing and seeing examples of very small
workshops (closets/small apartments/small bedrooms) and how people have
adapted a workshop to a very small space. Pictures or links to pictures
would be great. I would think the challenges of lighting, ventilation,

I was looking at some of the very expensive test equipment used to
troubleshoot circuit boards and it seems that they all use the Huntron type
of testing.  Injecting an AC signal and then viewing the results on a screen
and then comparing that to a working board. Equipment made ...

I have a Panasonic Fax/Phone machine that I really like except for one
feature.  You can't turn the fax part off without turning off the auto
answer.  I get to many junk faxes.  Can anyone think of a way to modify the
think so that I can turn off the fax receive part and still ...

A follow up question to my last post.  Which lettering system is universal
to older IC's.  Example.  If I buy a 75HCXXX can I swap that into a 74LCXXX
or 74??XXX.  Are the HC the latest and completely backward compatible? If
not is there one that is somewhat universal so that if ...

I'm trying to replace a Bertan 230-30R power supply that died recently,
so I'm looking for something that can go form 0 to at least 30kV with a
maximum current of 0.4mA. Higher maximum voltage, the ability to go
from -30kV to +30kV, or both, would be nice but arn't really necessary.

I work on coin operated equipment and it seems when ever I suspect a bad IC
or transistor or other part I have to drive into town or order it over the
net.  Is there a place that sells most of the commen IC's and transistors in
bulk, cheaply.  So I can buy one big mass of parts ...

Bad day at the office (shack) - two failure in one day ;-(
I recently turned on my trusty 7904A after perhaps 2 years of non-use...
It briefly displayed both traces (linup is 2 x 7A26, 7B92A, 7B53A), and
then the traces dissapeared after about 10 seconds and the scope is

I am looking for a service manual for a Wavetek 420 function generator. I
need to calibrate this instrument and need to know the settings for each of
the 10 internal pots.
John

Anyone have a need for a Transformer out of an older Tek scope? I can't
recall the exact model it came from off hand, but there are numbers on it to
identify it.
It was removed out of a working scope - scrapped only due to no space.

I need to replace an oscilloscope that has gone to the Great Test Bench
in the sky.
What Tektronix scope do you prefer?
I have always like the 7000 series...would you recommend these or