Date   
Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

donald collie
 

Does anybody have a parts mule thet can scavenge so I can complete this `scope [or advise where I can get this 100x attenuator module] Thankyou..................................................................................................Donald Collie ZL4GX

Raparing my "new" 547 Tel scope

felix_cantor@...
 

Hi everyone, new guy in town here....

I just purchased an old tek 547 that I started restoring and I just had the first BIG problem I guess.... When I purchased it it did work to some extent, it did fire up, tough the trace and triggering didnt seem very good. I thought the best thing to do as a first step was to give it the so called "wash" as it is suggested in the manual.

I took all the tubes out and carefully labeled them so that they would go back to their original position. Covered the transformer to make sure it wouldn´t get wet and proceeded with the wash, very carefully with a little bit of dish soap diluted in water and then rinsed it out. I tried to use the least water possible. Then I put it at full sun (here its summer) for around two days and then inside the house for another four days or so.

Today I tried to fire it up for the first time using a current limiter just in case something was screwed up, so that i wouldn`t damage the scope but it didnt turn on at all and the lamp from the current limiter turned lighted up at full bright! ...so i guess something is wrong. Sadly.

I`m not sure how to start finding out what the problem is, without taking risks of further damaging the scope. I`m a bit of an amateur, though i´ve built a few tube amplifiers, so, I know the basics.

Any help will be very much appreciated.

Thank you very much.

Felix

Tek 475 HV multiplier replacement

Dieter <ditt1@...>
 

Hi,
the HV multiplier in my Tek 475 is defective. I will replace it with a multiplier HRT507.
This is done several times as I have read in several forums.
My question is how to connect the HV-lead from the new multiplier to the
original HV-cable, so that no sparks will come out.
Any tips will be wellcome.
Thank you
Dieter

Mail Check

Dick
 

Every time I go to the Groups.io page (yes, every time), it says my account is bouncing.

I "un-bounce" it, but later when I go back, it says I am bouncing again.


This is to check if I am receiving mail despite that message.


73, Dick, W1KSZ


Sent from Outlook<http://aka.ms/weboutlook>

Tek 475 attenuator module [100x]...missing

donald collie
 

I`ve just been restoring a Tek 475, only to find after clearing all the faults that the little 100x attenuator module [part # 307-1014-10] is missing. Can anyone advise me where I might obtain this part? Alternatively, would someone like to swap one out of that parts mule 475, for cash. Thankyou.....................................................................................Donald Collie ZL4GX

Help restoring a 547 scope

felix_cantor@...
 

Hello everyone! New guy in town here ;)

I just purchased an used 547 that I want to fully restore.

It was in working condition when I bought it but the traces and the trigger systems didn`t work that well. Channel B didn`t even trigger.
The interior was quite dusty and dirty, so I decided to give it a bath as per the manual recommendation. I covered the transformer and took great care not to wet it and also not to wet the high voltage section for the CRT. After the wash I placed it at the sun for around 2 days and kept it in the house for another 4 days or so before trying to turn it on again. After that I plugged the unit to a current limiter just in case something was wrong with the scope after the wetting, and it seemingly was broken! The light was at full bright when I turned on the scope though the scope remained without any sign of being powered up. So I guess there is a short right at the beginning of the power section....

I`m some sort of an amateur so I`m not so sure how to proceed right now without screwing up the scope anymore. I`ve build a few tube amplifiers and restored a few old test equipment, so I know the basics really.

Any help will be very much appreciated.

Thanks.
F.

Re: Tek 475 HV multiplier replacement

n4buq
 

Sphere may have a replacement.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Dieter" <ditt1@...>
To: TekScopes@groups.io
Sent: Wednesday, January 10, 2018 10:18:06 AM
Subject: [TekScopes] Tek 475 HV multiplier replacement

Hi,
the HV multiplier in my Tek 475 is defective. I will replace it with a
multiplier HRT507.
This is done several times as I have read in several forums.
My question is how to connect the HV-lead from the new multiplier to the
original HV-cable, so that no sparks will come out.
Any tips will be wellcome.
Thank you
Dieter



Re: Transistor Cross Reference - Now N101 transistor info

Jon Batters
 

Hi Dave. , Usually easy to find the Logo on Google Search. Otherwise take close-up photo of Logo and post here. I have 4 books of electronic OEM Logos that can be easier to use then Google and cover from the old days of 1960's and one trackes OEMs that have gone onto new OEMs..

Jon Batters, Oregon

Re: Tek Blue Paint Color

Gary Robert Bosworth
 

Sam: In case you have not seen this before, there is a spray-on paint
called Krylon Bahama Sea and it is excellent for full coverage painting of
Tektronix panels. It is not good for touch-up because there is a slight
difference in paint tone, but a completely covered surface is
indistinguishable under all lighting. Sherwin Williams will order the cans
for you and they are only about $6.00 each. Definitely saves you a lot of
misery and cost of trying to mix your own.

Gary

On Thu, Jan 11, 2018 at 6:43 PM, Sam Reaves <sam.reaves@...> wrote:

Does anyone have the CMYK or RGB Codes or other data so one can have this
paint mixed locally?

Sam
W3OHM



--
Gary Robert Bosworth
@grbosworth
Tel: 310-317-2247

Re: Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

johncharlesgord
 

Donald,

Is the attenuator missing or is it defective? If defective, you might be able to fix it by opening it up and resoldering the pin-to-ceramic connections. They often develop some sort of intermetallic compound that causes opens at that point.

--John Gord

On Fri, Jan 12, 2018 at 05:19 pm, donald collie wrote:


Does anybody have a parts mule thet can scavenge so I can complete this `scope
[or advise where I can get this 100x attenuator module]
Thankyou..................................................................................................Donald
Collie ZL4GX

Re: Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

 

Hi Don,
What scope? And what is the part number of the 100X Attenuator?

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of donald collie
Sent: Thursday, January 11, 2018 7:25 PM
Subject: [TekScopes] Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

Does anybody have a parts mule thet can scavenge so I can complete this `scope [or advise where I can get this 100x attenuator module] Thankyou................................................................................................Donald Collie ZL4GX





--
Dennis Tillman W7PF
TekScopes Moderator

Re: Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

Harvey White
 

On Thu, 11 Jan 2018 19:24:58 -0800, you wrote:

Does anybody have a parts mule thet can scavenge so I can complete this `scope [or advise where I can get this 100x attenuator module]
All I have is a 307-1014-01. Not sure that it would be the same.

Harvey



Thankyou..................................................................................................Donald Collie ZL4GX

Re: Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

Dave Casey
 

I have both 307-1014-00 and 307-1014-01 to offer; brand new, never used.
But I do not have the -10.
The -00 and -01 are both 100x. The -10 is either just a later version or
perhaps designed to terminate differently? The 7D15 and 7A15A use the -00
and later the -01. The 7A18A uses the -01.
Haven't checked the 475 manual to see if earlier serials used the earlier
version or not.

Dave Casey

On Sat, Jan 13, 2018 at 12:26 AM, Harvey White <madyn@...>
wrote:

On Thu, 11 Jan 2018 19:24:58 -0800, you wrote:

Does anybody have a parts mule thet can scavenge so I can complete this
`scope [or advise where I can get this 100x attenuator module]

All I have is a 307-1014-01. Not sure that it would be the same.

Harvey



Thankyou...................................................
...............................................Donald Collie ZL4GX




Re: Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

donald collie
 

No, it`s a 307-1014-01 [I misread the part number on the one in the other
channel`s attenuator assembly]. I wondered why the CH2 was producing
nothing on 4 positions - the 100x attenuator is missing completely.
A good thing Tek socketed their transistors in the 475, i`ve found
two defective so far. I find the easiest way to service the 475 is to
remove each transistor and test . What goes wrong with a 42 year old 475? :
leaky DC restorer diodes, and failed sweep generator transistors [Q904, and
Q922]
When I was working for Broadcasting in the 70`s we had a 465, an R&S
POLYSCOP 1, and an AVO model8 Mk 5 multimeter, and that was all we had to
maintain 3 transmitting sites with 20kW television and Radio transmitters
and auxiliary equipment. Seat of your pants stuff! Now I have, in my own
test bay, a 475, an R&S POLYSCOP 2, and an AVO model8 Mk5, amongst other
equipment. Funny how all comes to he who waits. Thankyou for responding - I
have already asked Susan at Sphere Research to put one aside for me- so
i`ll obtain one there. [...and some of the correct transistors:-)
..............................................................................................................73`s
de Don ZL4GX


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On Sat, Jan 13, 2018 at 7:56 PM, Dave Casey <polara413@...> wrote:

I have both 307-1014-00 and 307-1014-01 to offer; brand new, never used.
But I do not have the -10.
The -00 and -01 are both 100x. The -10 is either just a later version or
perhaps designed to terminate differently? The 7D15 and 7A15A use the -00
and later the -01. The 7A18A uses the -01.
Haven't checked the 475 manual to see if earlier serials used the earlier
version or not.

Dave Casey

On Sat, Jan 13, 2018 at 12:26 AM, Harvey White <madyn@...>
wrote:

On Thu, 11 Jan 2018 19:24:58 -0800, you wrote:

Does anybody have a parts mule thet can scavenge so I can complete this
`scope [or advise where I can get this 100x attenuator module]

All I have is a 307-1014-01. Not sure that it would be the same.

Harvey



Thankyou...................................................
...............................................Donald Collie ZL4GX






Searching for source for P6138 spare part

Myname
 

Dear experts,

Yesterday, just when I - like zillion times before - was pulling off the probe tip of my P6138, I heard a soft crack, and when I looked at the probe I realized that its contact pin had broken off :-(.

http://www.bilder-hochladen.net/files/big/yb2-k-5cf2.jpg

Therefore my question: Does somebody of you know a source where I can buy the spare part 206-0392-00 for not too high a price (incl. shipment costs to Germany)? Or should I better try to get a used P6138 on Ebay?

Thanks in advance for any help.

Best regards

pudu51

Re: Tunnel diode 585a

Fred Schumacher
 

After checking and readjusting the trigger circuits, I came to the conclusion the TD was at fault.
I checked it alone according to the RCA TD manual and it turned out to be wrong.
So I have to look for a new TD to have my scope working as it was designed to do so.
Thanks to all for the help.
Fred

Sent from my iPad

On 7 jan. 2018, at 22:33, Albert Otten <aodiversen@...> wrote:

On Sun, Jan 7, 2018 at 11:19 am, Fred Schumacher wrote:

Is there a method to check this tunnel diode alone?
Any help appreciated.
Fred,

I would first try to re-adjust the triggering circuit as per calibration procedure. After so many years the bias current needed by the TD will have drifted up somewhat. Maybe a simple re-adjustment solves the problem. Especially because sometimes triggering works an sometimes not. The needed bias is somewhat temperature dependent, so the set value might be just at the border.

Albert


Re: OT: need special water line adapter or fittings

ken chalfant
 

Greetings,

I confess that I may not exactly understand your need.

However, it might be worth your time to wander through www.mcmaster.com<http://www.mcmaster.com> and www.supplyhoouse.com<http://www.supplyhoouse.com>

Wishing you success.

Ken

On 12Jan, 2018, at 2:51 PM, John Griessen <john@...<mailto:john@...>> wrote:

On 01/12/2018 03:29 PM, Ed Breya via Groups.Io wrote:
Lastly, I could make a tube section with a very sharp pre-bend and then cut to size and bead it, to use as the elbow/adapter.

That's likely to work best. To bend it you can put fine sand in first, get hot below dull red, bend tightly.

If it doesn't want to go all the way 90 deg at first try, just anneal by getting to dull red and water
quench to pop off some of the scale. Then go at it again, and when annealed you can tap on it and
smooth plier it to reshape to get your ferrule on. Remember to blow out any trace of that sand with compressed air both directions.

Re: Tek 475 attenuator module [100x]...missing

agaguk_99@...
 

Did you tried to resolder the attenuator ? Fix 2 of them doing that on my 475. Put some flux and a bit of new solder.

Re: Tunnel diode 585a

 

Fred,
Check the type or main specs of the TD you need. Most likely I have a replacement for you.

Raymond

Re: Tunnel diode 585a

Fred Schumacher
 

Hi Raymond,
It is the 1N3848 with an Ip=10mA. This TD is sandwitched between a holder with golden contacts.
I will keep my fingers crossed.
Thanks
Fred


Sent from my iPad

On 13 jan. 2018, at 18:48, Raymond Domp Frank <@Raymond> wrote:

Fred,
Check the type or main specs of the TD you need. Most likely I have a replacement for you.

Raymond