Traces and readout intensity are sometime very brighter than usual.
When this occurs two out of four neon bulbs located in HV "module"
flashes. These two bulbs are connected at pins 2 & 3 of CRT. I'm also
looking for the tech manual.
Any ideas?

Thks,
Daniel

You'll have to wait until Jim Yanik comes around for comfiration, but I
suspect the CRT.

Actually, that is not bad luck, IIRC there are some very hard to get
ICs for Tektronix scopes. Think it was the horizontal amp. Your problem
has nothing to do with that, so hopefully either you have ICs for
another scope or can find a CRT for yours.

Once sure of the problem, ESI in Cleveland OH has alot of Tek stuff.
You might try Skycraft in Orlando FL but they don't have as much, or
didn't last time I was there. Other than that there is always eBay.
There are other places, I just don't know of them.

Good luck with it.

JURB

Thanks for reply. Glad to hear about availability of TEK CRT's. In the
meantime of Jim advice's I'll use my 2213. Not the same feeling,
definitively.

Daniel

wrote in
ups.com:

Thanks for reply. Glad to hear about availability of TEK CRT's. In the
meantime of Jim advice's I'll use my 2213. Not the same feeling,
definitively.

Daniel



I have a 2213,too.
Nice scope,built it myself,from boards and parts other techs didn't fix.

[plus a few purchased parts to complete the job,and a FREE non-salable CRT
thanks to Vern Isaacs who ran CRT manufacturing at TEK.]

--
Jim Yanik
jyanik
at
kua.net

Jim Yanik wrote:

wrote in
ups.com:

Thanks for reply. Glad to hear about availability of TEK CRT's. In the
meantime of Jim advice's I'll use my 2213. Not the same feeling,
definitively.

Daniel



I have a 2213,too.
Nice scope,built it myself,from boards and parts other techs didn't fix.

[plus a few purchased parts to complete the job,and a FREE non-salable CRT
thanks to Vern Isaacs who ran CRT manufacturing at TEK.]


That reminds me of the old Johnny Cash song, "I got it one piece at a
time". ;-)

http://www.cowboylyrics.com/lyrics/cash-johnny/one-piece-at-a-time-2214.html


--
HELP! My sig file has escaped! ;-)

"Michael A. Terrell" wrote in
:



Jim Yanik wrote:

wrote in
ups.com:

Thanks for reply. Glad to hear about availability of TEK CRT's. In
the meantime of Jim advice's I'll use my 2213. Not the same
feeling, definitively.

Daniel



I have a 2213,too.
Nice scope,built it myself,from boards and parts other techs didn't
fix.

[plus a few purchased parts to complete the job,and a FREE
non-salable CRT thanks to Vern Isaacs who ran CRT manufacturing at
TEK.]


That reminds me of the old Johnny Cash song, "I got it one piece at
a
time". ;-)

http://www.cowboylyrics.com/lyrics/c...at-a-time-2214
.html



The first TEK scope I built from old boards was a 5 Mhz 221 mini-scope,but
it had problems in the 4 layer PCBs,I had to jumper too many runs,so I
traded it for boards for my 2213. It's CRT was too small for much
use,anyways.

--
Jim Yanik
jyanik
at
kua.net

wrote in
oups.com:

Traces and readout intensity are sometime very brighter than usual.
When this occurs two out of four neon bulbs located in HV "module"
flashes. These two bulbs are connected at pins 2 & 3 of CRT. I'm also
looking for the tech manual.
Any ideas?

Thks,
Daniel


BTW,the DC restorer diodes could be breaking down intermittently under HV.
They're part of the CRT brightness circuit.

--
Jim Yanik
jyanik
at
kua.net

wrote in
oups.com:

Traces and readout intensity are sometime very brighter than usual.
When this occurs two out of four neon bulbs located in HV "module"
flashes. These two bulbs are connected at pins 2 & 3 of CRT. I'm also
looking for the tech manual.
Any ideas?

Thks,
Daniel


TEK puts a couple of neon lamps between the CRT cathode and grid to limit
the voltage difference between them to less than ~130v to protect the
CRT;pins 2,3 are CRT cathode and grid.(P1,14 are filaments)

I do not have access to any TEK manuals anymore.

--
Jim Yanik
jyanik
at
kua.net

I recommend you check for a couple of failure possibilities:

First: DC restorer diodes might be damaged, as Jim says.
If ok, check for cold solder joints near insity pot (cracked due to
mechanical stess, cold solder, etc.9.
If ok: I suspect CRT (had this 3 times), but CRT seldom fails to my
experience in the 2213/2215 sereis scopes.


hth,
Andreas