Re: 577 D2 question(s)


Eric
 

If you are shopping the tube is easly identifiable by the unique marks in
the lower left corner. 5110 is the right number now that I remember which
also means don't feel bad about scrapping the frame it is only 10 Mhz so
the tube is in a better place in my opinion

Eric

On Wed, May 5, 2021, 1:38 PM Andy Warner <andyw@pobox.com> wrote:

From a brief scan of tekwiki - it looks like if I need a 154-0633-10, I am
specifically on the hunt for a 5110 with serial # >= B103611, and a known
bright trace.

Given that info, it looks like I have a couple of options on ebay,
including a bare tube - but of course no real info on trace brightness...

On Wed, May 5, 2021 at 11:46 AM Andy Warner <andyw@pobox.com> wrote:

Thanks for the mapping to the 5000 series, did not realize that.

My father-in-law was the TV repair man for a small town in the midwest
for
40 years, I am sure we threw out a couple of rejuvenators when we cleared
out his workshop after he died, but that was well before I got into
owning
Tek gear - little did I know.

On Wed, May 5, 2021 at 11:16 AM Eric <ericsp@gmail.com> wrote:

The 5220 is an old 10Mhz or 20Mhz 5000 frame. I would much rather have
a
functional curve tracer then at 20Mhz scope but that is just me.

Eric

On Wed, May 5, 2021, 11:38 AM Paul Amaranth <paul@auroragrp.com>
wrote:

Early on, Tek listed the 5000 mainfame and display unit seperately,
so
you could get a 5103 frame and a D11 storage display. That doesn't
seem to have lasted very long so it gets very confusing, but the only
difference between a D10 or D11 and the 577 display is the probe
callibration terminal on the front.

One of the big advantages of the 577 over the 576 is the ease of
replacing
the CRT unit if it goes bad. You should be able to find a donor 5000
scope
around $50. Despite the huge screens nobody wants them because of
the
low
bandwidth. Heck, you can probably find one free if you want to look
hard
enough.

I have an old 5000 scope with a D11 storage display that I want to
put
into
my non-storage 577 one of these days.

Go ahead with the full rejuvination, you can't lose much and you
might
get
a couple hundred hours out of it. That will give you time while you
look
for a 5000 donor.

What's a 5220? I can't find a reference to that.

Paul

On Wed, May 05, 2021 at 11:15:27AM -0400, Eric wrote:
Andy tubes are really available for the 577 d2 they can be salvaged
from
one of the 5000 series scopes. If I remember correctly the 5220 is
the
one
you want to find. It is a direct drop in replacement I can confirm
the
scope later today of need be.

Eric

On Wed, May 5, 2021, 11:05 AM Andy Warner <andyw@pobox.com> wrote:

Thanks all,
I was hoping it would not be the tube, I have been lucky
enough
to
avoid that on my other Tek gear.
I'll take a pass at the HV board first, but it sounds like I
likely
have a
poisoned cathode.

Any reason I should not try a full rejuvenation - including
applying
some
current limited HT between cathode and grid, or is there a reason
you
suggested just overdriving the heater, Bob ?

From the serial #, my unit has the 154-0633-10 tube, which
appears
to
be
unobtainium - sigh.

On Tue, May 4, 2021 at 10:33 AM <robeughaas@gmail.com> wrote:

The symptom is known as "double peaking" and indicates the CRT
has
cathode
interface, AKA cathode poisoning. The CRT is near the end of
its
life.
Applying 12 volts for 10 or 15 minutes to the filament (with
the
instrument
power off, since, in operation, the filament is at -3400
volts),
may
effect
a temporary repair. Access to the filament is easy via a
two-pin
connector
on the HV/deflection board.

--
Bob Haas





--
Andy










!DSPAM:6092b6ab251027023613042!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix/Linux - We don't do windows









--
Andy





--
Andy





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