I second Tom on this, the only difference between the -10 version
is a longer HT lead due to the updated multiplier having a built in socket
instead of a flying lead. I do have duff versions of both tube and neither
have the pin 12 connected. In the -00 as Tom says there is an unattached 3cm
wire, In the -10 the pin is used as a support for one of the glass rods, no
other connection. I've seen 2230's and 32's of all flavors with both versions
of tube interchanged, the only way you can't do it is if the scope has the
updated multiplier (requires a longer HT lead) and even then I've seen the HT
leads modified. The missing components referred to do allow the use of a 465
CRT See
about half way down the page. JC
--- In TekScopes@..., "Tom
Jobe" wrote:
>
> Hi Tom,
> Thank you for posting a nice
summary of your progress, but there is something wrong here.
> Pin 12 on
the 154-0861-00 CRT is not connected to anything inside that CRT unless I'm
confused (which is very likely).
> I have several broken samples of that
same CRT, and pin 12 comes into the CRT maybe 30 mm and then stops. It lays
against the side of one of the four glass rods that support the internal
structure, and touches no metal that I can see.
> Later today I could
post some pictures from my broken CRT collection.
> Pin 10 connects to
the metal can the expansion mesh dome sits on.
> tom jobe...
> PS
Maybe look at your -10 CRT and see where pin 12 goes internally?
> I
don't have a broken -10 CRT to look at.
>
>
>
>
----- Original Message -----
> From: Tom Miller
> To: TekScopes@...
> Sent: Saturday, January 26, 2013 10:22 AM
> Subject: Re:
[TekScopes] Need part 2232 CRT and source for a tube - update
>
>
>
>
> This is a follow-up to my repair of a 2232 scope
with a bad CRT, part number 154-0861-10.
>
> I was able to find,
for a very good price, a bad 2215A that seemed to have a good tube. It turns
out that the 2215A uses a 154-0861-00 CRT. This tube brings the mesh electrode
out on pin 12 of the CRT socket. The -10 tube either does not have a mesh or
it is internally connected to some other element. In any event, the -00 tube
must have the mesh connected to a -100 volt bias. Operating with the mesh
un-connected will cause all sorts of strange behavior such as the display size
changing with position control changes.
>
> The good news is that
there is track on the PC board to support the components needed to make this
negative supply. In essence, a high speed diode (UF4007) is connected to the
anode of CR955, C853. The cathode connects to this point. A 0.1/200 volt disk
capacitor connects the anode of this diode to ground. A 470K/ 1/4 watt
resistor goes across the capacitor. Run a wire from this point, (anode of the
UF4007) to pin 12 of the -00 CRT. Now the new tube will work fine. A careful
study of the power supply in this area will reveal that there is unused track
needed to do this mod.
>
> Good luck and email to the list if any
problems.
>
> As a side note, if I can find a way to re-weld the
connection from pin 5 to the astig electrode inside the tube, I will regain a
working tube. Anyone have a welding laser? :)
>
>
Regards,
> Tom
>
>
>
> ----- Original Message
-----
> From: Tom Miller
> To: TekScopes@...
> Sent: Tuesday, January 22, 2013 9:01 PM
> Subject: Re:
[TekScopes] Need part 2232 CRT and source for a tube
>
>
>
>
> Hi Tom,
>
> That's what I read somewhere, that
the -00 tube was for the early units. The one in my scope is the -10 and it
does not have the mesh. At least it is not brought out on pin 12 like in the
2215A. The HV multiplier has a short flexible lead and connector..
>
> I scored a "for parts" 2215A today for mostly shipping cost so we
will see. If necessary, I can add in the -100 volt supply.
>
>
Anyway, off to the archives.
>
> Thanks,
> Tom
>
>
> ----- Original Message -----
> From: Tom Jobe
> To: TekScopes@...
> Sent: Tuesday, January 22, 2013 8:23 PM
> Subject: Re:
[TekScopes] Need part 2232 CRT and source for a tube
>
>
>
>
> Hi Tom,
> I think the CRT for your 2232 is identical
to the one in a 2215A (154-0861-00), unless you have one of those late 2232's
that has the shorter HV lead on the CRT (154-0861-10). The HV multiplier
changed on the last 2232's. It did not have a flexible lead coming out of the
multiplier, the CRT HV lead plugged directly into it on the front side. The
Tekscopes archive has some discussion about the later "dash 10" version of the
2232 CRT.
> I do believe that all of those 154-0861-xx CRT's use the
"expansion mesh" (or whatever it was called).
> tom jobe...
>
>
>
>
> ----- Original Message -----
>
From: Tom Miller
> To: TekScopes@...
> Sent: Tuesday, January 22, 2013 5:01 PM
> Subject: Re:
[TekScopes] Need part 2232 CRT and source for a tube [1 Attachment]
>
>
>
>
> It looks like the tube has a factory
defect where they failed to weld the pin 5 lead to the strap going to the
astig element. I wonder if there is any way to externally weld it? Induction
welding, laser, other? I can't use high voltage as there is no access to the
element. I attached a picture showing the fault. If I tap the tube, the screen
comes into focus. I verified all the connections externally.
>
>
Next question,
>
> Somewhere I read that a tube from a 2215A
would work. However, that tube uses a mesh electrode whereas the 2232 tube
does not. The only difference that I can see is they connect the mesh (pin 12)
to a -100 volt supply.
>
> I need to find a junker 2232 with a
good tube.
>
>
> Regards,
> Tom
>
>
> ----- Original Message -----
> From: Tom Miller
> To:
TekScopes@...
> Sent: Friday, January 18, 2013 9:48 PM
> Subject: Re:
[TekScopes] Need part 2232 CRT and source for a tube
>
>
>
>
>
> Looks like the same tube is used in the following
scopes:
> 2213A, 2215A, 2220, 2230, 2235, 2235L, 2236
>
>
> Tom
>
> ----- Original Message -----
> From: Tom
Miller
> To: TekScopes@...
> Sent: Friday, January 18, 2013 9:34 PM
> Subject: [TekScopes]
Need part 2232 CRT and source for a tube
>
>
>
>
> I received a 2232 scope with the UPS obligatory damage. Something in
the tube is loose and the display is way out of focus. A very light tap on the
tube seems to cause an internal connection to make and focus comes in very
briefly.
>
> Does anyone have a tube for the 2232 scope? Part
number 154-0861-00 or -10
>
>
> Regards,
>
Tom
>
