On Fri, 19 Apr 2013, Noel Keith wrote:

So, I recently got a Tektronics 545B oscilloscope. It's been sitting in
a basement for god knows how long, and I thought it would be cool to see
if it worked. well, it doesn't. It's missing it's fuse and fusecap, and
it's power cable. I had read in a couple of places that the fuse only
affected the high voltage stuff, like the CRT. I might be totally wrong
about this, which is why I'm asking you guys Well, with that in mind,
I found a newer power cable that seemed to fit the bill, so I tried
using that. Nothing. I then tried using a voltage regulator. Still
nothing. Now, I'm not sure if it's because of the mysterious missing
fuse, or if something else has gone bad inside, or if it was the power
cable (which I doubt). My next guess was that it was the missing fuse.
Holy crap does this thing have a strange fuse. I've looked all over for
something with a similar rating and size, but with no luck. I'm not as
worried about the fusecap.

Of course the fuse takes care of the whole thing, it's in the primary to
the power transformer. F601, it's a 6amp fast-blo 3AG fuse for 120vac
operation (3ampts if running off 240v). It's a standard glass fuse, you
should be able to get them anywhere. It goes into the fusecap, then you
screw (or is it turn?) the fusecap into the holder at the back of the
scope. I don't know where the fusecaps can be found these days, I
suddenly find I need one and can't find any among all the junk.

Nothing will happen unless that fuse is in place, and that includes the
fusecap.

There's also a thermal cutout fuese in series to the primary of the power
transformer, but that isnt' even a factor until you get the proper fuse in
there witha fusecap.

I got one 20 years ago, though havent' had it on in about 10 years. It
was working fine when I got it, but I since someobody found it at a
hospital as it was about to be tossed out, I suspect it was still in
operation. It worked for a while, then the trace got bent. It's a
multiple section power supply I wasn't sure which section was the problem,
I found it by taking the probe and touching each of the sections across
their filter capacitor, until the waveform got worse. Changed that filter
capacitor, and all was fine. It is incredibly bulky, which is why I moved
it to the basement and thus it's a lot less useful, so it just sits there.


Michael


I searched for a couple weeks online, but I
eventually came to the conclusion that the thing would probably never
work. Today though, I thought I'd give it a go again. Back of the
oscilloscope: http://i.imgur.com/uM64sfX.jpg I opened it up to find TONS
of gunk and dusk blanketing it's insides. I also found a pdf of its
manual (which has slightly more info about the missing fuse). Now I
think I got in over my head, because I'm too scared to touch anything.
Before I go fiddling with 50 year old electrical components, I want to
know if it works or not, what I can do to fix the fuse situation (even
if only temporarily), and if I should check for anything else.

So, can anyone help me? I'd REALLY like to get this guy working again, but I need some help (obviously, hehe...)