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Greetings All,
I would like to inquire if anyone in this fine group of ours has a CRT for a Tek 2235, or 2236 for sell, or trade.
The part number on the CRT is 154-0861-00.
I received this 2235 from another TekScopes member after I begged on this group for any source of Test equipment in Texas some weeks back.
I was delivered a fine selection of Tektronix equipment, at an excellent price, but this tube seems somewhat elusive.
If anyone has an extra, or a 2235 or 2236 they have stripped for parts, except for the CRT, could you please contact me?
The 'Scope is in pristine condition, except for the CRT, which is obviously at atmospheric pressure.
Best Regards,
Darrin

I would like to inquire if anyone in this fine group of ours has a CRT for
a Tek 2235, or 2236 for sell, or trade.
The part number on the CRT is 154-0861-00.

----------

Darrin
If you don't manage to find a 0861 CRT then in most cases you can use a
0731 tube from a 465/465B/468 which is more likely to be available. However
there are a couple of caveats -

-The 0731 does not have integrally mounted trace rotation coils so the ones
from the old CRT must be swapped over.

-Pin 12 on the CRT base must be reading approx 100v, an early 2235 will
have this but the voltage will be missing on later ones. In this case to
successfully use the 0731 you must add 3 components - CR879, R879 and C879.
The mounting holes for these should already be drilled in the pcb (under
the power supply cover) and they should show on the silk screen print so
adding them is easy. Values are R879 510K 5% 0.25w, C879 Ceramic 0.1uF
200v, CR879 is 400v 750mA and has a Tek part number of 152-0413-00, mfr no
shown as UTR307, but I have successfully used 1N4004 in this position.

...Ben

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--- In TekScopes@..., Ben Clarke <benclarke@b...> wrote:

I would like to inquire if anyone in this fine group of ours has a

CRT for

a Tek 2235, or 2236 for sell, or trade.
The part number on the CRT is 154-0861-00.

----------

Darrin
If you don't manage to find a 0861 CRT then in most cases you can

use a

0731 tube from a 465/465B/468 which is more likely to be available.

However

there are a couple of caveats -

-The 0731 does not have integrally mounted trace rotation coils so

the ones

from the old CRT must be swapped over.

-Pin 12 on the CRT base must be reading approx 100v, an early 2235

will

have this but the voltage will be missing on later ones. In this

case to

successfully use the 0731 you must add 3 components - CR879, R879

and C879.

The mounting holes for these should already be drilled in the pcb

(under

the power supply cover) and they should show on the silk screen

print so

adding them is easy. Values are R879 510K 5% 0.25w, C879 Ceramic

0.1uF

200v, CR879 is 400v 750mA and has a Tek part number of 152-0413-00,

mfr no

shown as UTR307, but I have successfully used 1N4004 in this

position.

...Ben

I would like to add to Ben's post that if the components are missing
then most likely the wire between the circuit board and pin 12 of the
CRT socket is also missing.
/Zenith, Sweden