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Noob needs help with a 453 no sweep

Brian Mathews
 

Hello, I am working on a neglected Type 453 right now and could use some help on whether I am on the right track or not.

I have checked all voltages on the power supply and R&R the locked up fan to get it freed up and working. Current situation is I have a dot on the screen which is fully adjustable but absolutely NO sweep. I had CH2 working for a while (so I had 2 dots, still no sweep) but it is intermittent and now not working again. I pulled all transistors and cleaned the legs with deoxit and reinserted which seemed to help. Also found most of the pcb mounting screws were loose, one had completely fallen out and was wedged in by the wiring harness. Bottom line is I have tried everything I can think of and can't get any sweep but I am getting a dot that I can move up or down, side to side, etc. Tried swapping the Sweep Gen transistors and a few others in that area where i could find another component of the same value and made no difference.
Thanks!! Brian W6BRY


Re: CRT rebuilding

 

If had had a good 2567B I would take you up on it!

I know that some tubes are a little more available, such as for the 465 and many for the 24XX. Haven't seen any NIB for a 7104 or even the 7904. Currently there is a used one for a 7603 listedon ebay at 200.  I don't have that model at the moment either, but I probably would go that high for a NIB tube.
  And CRT's used or otherwise are often not available at all for many of the older models that so may like to restore.

On Monday, March 2, 2020, 01:09:25 PM EST, victor.silva via Groups.Io <daejon1=yahoo.com@groups.io> wrote:

During all my years refurbishing Tek 24xx series I have been able to trade/barter/buy(when within reason) a large collection of NIB CRTs for the 2465x/45x and even 2 NIB 2467B CRTs.  If ThomasElectronics comes back with "$300-400 dollars, maybe more" I would certainly consider selling a few NIB 154-0850-01 CRTs for that.

--Victor


Re: 547 scope HV transformer problem. One practical solution.

ki6bge
 

Could be. I know that I have resurrected many older pieces of equipment and
I definately feel the Karma. I got a 1969 dodge dart from a co-worker for
free if I could fix it. $35.00 timing chain was all it took. 2 years later
I put a new engine in it, repainted it and put a new vinyl roof on it. My
girlfriend and drove it to Carmel Ny The Sea and got married. My father and
mother grew up during the great depression and taught me "waste not, want
not. I'll be 70 in October and just because we get old doesn't mean we're
not useful.

On Mon, Mar 2, 2020, 14:03 Ernesto <ebordon@swbell.net> wrote:

Tim, is it possible that inanimate objects gain a soul when they come in
contact with us? Could obsolete objects express gratitude when we give
them a new life or keep them alive?
If feel this with my 1995 Nissan Maxima. It is serving me for the last 25
years without being placed in the hand of a professional mechanic, and I
feel a bond when I drive it every couple of days.

Ernesto




Re: 547 scope HV transformer problem. One practical solution.

 

Tim, is it possible that inanimate objects gain a soul when they come in contact with us? Could obsolete objects express gratitude when we give them a new life or keep them alive?
If feel this with my 1995 Nissan Maxima. It is serving me for the last 25 years without being placed in the hand of a professional mechanic, and I feel a bond when I drive it every couple of days.

Ernesto


Re: 547 scope HV transformer problem. One practical solution.

ki6bge
 

I love my Tektronix 2215. It does what I need and is very accurate. I got
it from a friend in non-operative condition. A set of capacitors brought it
back to life. It used my Fluke 77 to troubleshoot it.
Have fun. The satisfaction of restoring old equipment feels so good.
Tim Sutton
KI6BGE
Torrance, CA

On Mon, Mar 2, 2020, 13:31 satbeginner <castellcorunas@gmail.com> wrote:

My trip into memory lane - read "Old Technology" was this one:

Just for the fun of checking if I could still repair an "older" radio, I
bought a broken Blaupunkt Palma AM/FM radio.

This thing was build in 1959, like myself, and has a solid state rectifier
and 6 tubes - or valves - depending on what side of the globe you live....

I used my -also old- Tektronix 2467B to check the voltages, oscillator,
etc. although that was a bit of an overkill...

Long story short, it works again, it has a really good sensitivity on the
FM, and has a remarkably low component count, and is actually fun to listen
to.

It's now my radio in my hobby room, where the HP, Keihtley, Wavetek,
Philips and Fluke stuff lives :-)

The thing I'm working on now is a near mint 2215A. Not the most impressive
scope, but nice and light to carry if I need to go somewhere.

I hope to receive some parts for it from Greece any day now.

Everything will get old at one point, but technology stays technology, and
some of it is just marvelous!!

Just my two cents,

Leo




Re: CRT rebuilding

Miguel Work
 

CRT restoring company in Spain, Barcelona, at 2010

https://eltecnigraf.wordpress.com/can-batllo-adeu-a-la-ciutat-dels-oficis/lectroscan-ultim-refugi-dels-raigs-catodics/



-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de victor.silva via Groups.Io
Enviado el: lunes, 2 de marzo de 2020 19:09
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] CRT rebuilding

During all my years refurbishing Tek 24xx series I have been able to trade/barter/buy(when within reason) a large collection of NIB CRTs for the 2465x/45x and even 2 NIB 2467B CRTs. If ThomasElectronics comes back with "$300-400 dollars, maybe more" I would certainly consider selling a few NIB 154-0850-01 CRTs for that.

--Victor


Re: 547 scope HV transformer problem. One practical solution.

satbeginner
 

My trip into memory lane - read "Old Technology" was this one:

Just for the fun of checking if I could still repair an "older" radio, I bought a broken Blaupunkt Palma AM/FM radio.

This thing was build in 1959, like myself, and has a solid state rectifier and 6 tubes - or valves - depending on what side of the globe you live....

I used my -also old- Tektronix 2467B to check the voltages, oscillator, etc. although that was a bit of an overkill...

Long story short, it works again, it has a really good sensitivity on the FM, and has a remarkably low component count, and is actually fun to listen to.

It's now my radio in my hobby room, where the HP, Keihtley, Wavetek, Philips and Fluke stuff lives :-)

The thing I'm working on now is a near mint 2215A. Not the most impressive scope, but nice and light to carry if I need to go somewhere.

I hope to receive some parts for it from Greece any day now.

Everything will get old at one point, but technology stays technology, and some of it is just marvelous!!

Just my two cents,

Leo


Re: 547 scope HV transformer problem. One practical solution.

 

Hi Harvey,

"oh look, old technology" Again, the adjective OLD should not be used with technology. Technology is simply technology.

The reason I got drawn again into electronics is that I got a suggestion to get rid of my OLD collection of records, and I wanted to listen to them one last time. So I pulled out of my closet my record player (OLD technology), a nice Technics SL-6 that had been unused for decades. I connected it, turned on, and a smell of burning came out of the dead device. So I promptly found the service manual online and started to look and see what could have gone wrong. Possibly an electrolytic capacitor... This turntable has a direct drive and some servos to scan the disk and automatically position the stylus moving along the tracks. All this was interesting to learn. There were some waveforms to check in the troubleshooting procedures, and this brought the interest for an oscilloscope. And so I was drawn into reviving my OLD 547.

It turned out that I was able to troubleshoot the turntable without looking at waveforms. The problem was indeed a small electrolytic cap across the muting relay in the tonearm that had shorted out, and the driving transistor burned out. I had to learn and understand the design of the turntable, an interesting experience that gave me appreciation for this OLD equipment. And this, in turn, brought a desire to listen again of my collection of masterpieces of classical music, which I had put aside when I bought one of the first CD players on the market, a Sony CDP-102 ... that was also junked and broken and... which I ALSO repaired and got to work again.

So now I am in an emotional renaissance of the past listening to my old 33 rpm records and CDs that had vanished from my memory, and I have a new appreciation for all the earlier (not OLD) technologies that gave me so much enjoyment several decades ago. This does not take anything away from the appreciation of today's modern technology, which will be "earlier" in some future.

Ernesto


Re: 547 scope HV transformer problem. One practical solution.

 

Hi Doug,

"That old test equipment"... "OLD" is not an adjective that should be used with test equipment or tools in general. The basic tools I have (hammer, pliers, etc) are incredibly old, and working fine. As for electronics, I have a relatively new multimeter with digital display, auto-ranging and advanced features, precise, economical. But I use more my old cheap Radio Shack MICRONTA 22-221, which I found junked in the garage and restored it. I rarely need precision, like when measuring continuity, and I prefer to see the needle move than the digits flicker with the auto-ranging. Maybe because my eyes are old too? LOL.


Re: CRT rebuilding

victor.silva
 

During all my years refurbishing Tek 24xx series I have been able to trade/barter/buy(when within reason) a large collection of NIB CRTs for the 2465x/45x and even 2 NIB 2467B CRTs. If ThomasElectronics comes back with "$300-400 dollars, maybe more" I would certainly consider selling a few NIB 154-0850-01 CRTs for that.

--Victor


Re: Modifications to 577 Curve Tracer Main Power Supply

 

On Mon, Mar 2, 2020 at 04:34 AM, Gary Robert Bosworth wrote:


Thank you to everyone. I now have ideas of where to look. I probably have
more than one problem. I will continue to troubleshoot in a few days.
Good luck, Gary. I'm curious to know what you'll find.

Raymond


Re: CRT rebuilding

Eric
 

Interesting thought. I wonder if they would work on 576 crts I have 2 -5
tubes that could use a rejuvenation. Or possable rebuild. For the 1 off
tubes like that I would not mind paying for a rebuild.

On Sun, Mar 1, 2020, 10:22 PM Roy Thistle <roy.thistle@mail.utoronto.ca>
wrote:

Hi All:
I ran into a guy who owned one of the service companies that used to
supply rebuilt CRTs for televisions... it was a good business for about 15
years. Basically, he would rebuild (install a new gun assembly) onto a unit
with a failed one (either filament damaged, or emitter components damaged)…
he did not do any re-phosphor. He could charge T.V. repair shops about 20%
less than the manufacturer supplied CRT.
My guess is... if the guns for Tek CRTs are not available (and where would
they be?)... or unless possibly one wanted burn-in repair on the screen (so
re-depositing the phosphor) on an otherwise strong CRT... then rebuilding
is not going to happen. Guns for popular television tubes where
manufactured by the 100's of millions... and maybe still are available in
China, of the former C.C.C.P. countries. Tek guns... not so much.
Best cheers and wishes.
Roy




FS: Late serial 7104 with 2x7A29, 7B15, 7B10 in UK

 

I've not used this more than 3-4 times since I bought it a few years back
from an estate sale in the Manchester area.

The person who owned it was a collector and had HUGE amounts of stuff, all
in almost new condition.

Serial B052922 which is very late AFAIK, and it is in very fine condition.

It has minor screen burn in the readout area, and no obvious signs of burn
in the rest of the CRT screen.

I only broke the calibration seals to have a look inside!

It comes complete with a "dead tree" service manual.

I'm not really sure what to ask for it so make me an offer (off list).

Given the risk of shipping damage, this is for collection only from
Kenilworth, GB

David


Re: 547 scope HV transformer problem. One practical solution.

tek_547
 

On Wed, Feb 26, 2020 at 07:41 PM, Ernesto wrote:


It has now inside an added little centrifugal blower fan that cools the HV
supply. This has solved the classical HV transformer problem, that caused it
to fail after 10 minutes.
Effective solution Ernesto to put a fan on the HV section, I did the same with my 647A. Worked good before the fan but better safe then sorry. The temp from the core of the transformer is lowering about
2°C with no holes in the HV box so there is room for more improvement.


Re: Wanted Tektronix 2756P / 2794

Ron
 

Marc,

Have a Tektronix 2753P on the bench, but available.

regards, Ron


Tek 214 vertical amplifier problems

Harvey White
 

I have a 214 I got quite a while back, and have replaced the batteries, the mode switch (store/norm/single sweep, etc).

However, the vertical amp on channel 1 seems to be off by a lot. IIRC (and it's been a while), some of the attenuation settings are off, very off.  I'm thinking it might be the switch, but the way the thing is constructed makes it difficult to troubleshoot (it's a wrap around style that hides all the interesting parts).

I'd be interested in a new vertical amp board, if there are any available at a (to me) reasonable price.  Getting the probes would be nice as well, but I'd also be able to print a back plate and put in two BNC jacks with peltoler connectors, and that would allow me to do standard probes.  That would defeat running it from the line and having isolation, but that's not been a need for me.

Anyone have any repair tips either?

What I think I do want is something around a 225 or so, digital scope would be good, not that I have to have it, but it's cute....

I really do need the two channels...

Harvey


Re: Modifications to 577 Curve Tracer Main Power Supply

Gary Robert Bosworth
 

Thank you to everyone. I now have ideas of where to look. I probably have
more than one problem. I will continue to troubleshoot in a few days. Gary

On Sun, Mar 1, 2020, 17:29 Raymond Domp Frank <hewpatek@gmail.com> wrote:

On Mon, Mar 2, 2020 at 02:01 AM, Ed Breya wrote:


while those made on caps and transistors may not reflect how they behave
in
actual operation.
I thought about that, especially re. Q722 just being two diodes. Next,
since Gary mentioned he had checked all parts, I thought he'd checked them
for what they are supposed to be. That left the possibility of a continuity
problem with said point being a nice candidate.

Raymond




Re: CRT rebuilding

Roy Thistle
 

Hi All:
I ran into a guy who owned one of the service companies that used to supply rebuilt CRTs for televisions... it was a good business for about 15 years. Basically, he would rebuild (install a new gun assembly) onto a unit with a failed one (either filament damaged, or emitter components damaged)… he did not do any re-phosphor. He could charge T.V. repair shops about 20% less than the manufacturer supplied CRT.
My guess is... if the guns for Tek CRTs are not available (and where would they be?)... or unless possibly one wanted burn-in repair on the screen (so re-depositing the phosphor) on an otherwise strong CRT... then rebuilding is not going to happen. Guns for popular television tubes where manufactured by the 100's of millions... and maybe still are available in China, of the former C.C.C.P. countries. Tek guns... not so much.
Best cheers and wishes.
Roy


Re: DS1742W-120 replacement adapter?

amirb
 

Does anybody know at which addresses the number of power cycles and hours of operation (in TDS3000B series) are stored in the DS1742W NVRAM?
and what is the format?
I remember I saw that information somewhere a while back but I cannot locate it


Re: CRT rebuilding

BW
 

For what it's worth, the Early Television museum has the facilities to do rebuilding, just not the staff nor time to do it full-time.

If they get that online though, odds are the Tek folks will be behind a mile long queue of folks wanting to get their TV CRTs rebuilt...

http://earlytelevision.org/crt_rebuilding_at_museum.html

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