Date   

Re: TM504 Fuse Alternate

 

On Thu, 26 Apr 2012 12:16:49 -0000, "Patrick Wong" <patwong3@...>
wrote:

I own a TM503 and TM504. Fortunately I have not had any series-pass power transistor failures.

However, in the event of a future failure, can you or other group members recommend suitable replacement NPN and PNP transistors? When I researched that previously it was not obvious that suitable transistors of the correct physical form-factor are still available, and I was left with the impression it may be necessary to modify the transistor's physical mounting when installing a replacement.
The MJE2801 (NPN), NTE182 (NPN), MJE2901 (PNP), and NTE183 (PNP) are
TO-127 pinout compatible replacements but very expensive now.
Tektronix apparently also used the SJE924 (NPN) and SJE925 (PNP) but
they are even more difficult to find.

If I had to replace them, I would probably use an MJE2955T and
MJE3055T or similar and modify the layout.


541A and Type H in Colorado Springs

sipespresso <sipespresso@...>
 

I have no affiliation with the seller.
http://cosprings.craigslist.org/ele/2971573894.html
-Kurt


Re: TM504 Fuse Alternate

Robert Simpson
 

Yes, I may need to re-do that check. I checked out that TM504 when I got it, but just somehow damaged it while working on the PS503A. The plug-in ended up working after new parts, but I will need to recheck the TM504 slots I was using (both with and without my extender). (Side note, the extender from John Griessen's kit works great).
So now I have another working PS503A (as tested in my second TM504), but need to repair the Test TM504.
Bob

--- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote:

You should also check the power transistors in the mainframe. There is a PNP and a NPN for each slot. Since these are often used for power supply pass transistors, if any are shorted it may do harm to an otherwise good plugin.

I took one of the edge connector boards sold for making extender cables and installed six leads, three for each transistor. With banana plugs on the ends, I can do a real quick test with the curve tracer of each transistor. I check the NPNs first slot by slot. Then the PNPs. It also weeds out very low beta devices.


Regards,
Tom

----- Original Message -----
From: Rob
To: TekScopes@...
Sent: Wednesday, April 25, 2012 8:34 PM
Subject: RE: [TekScopes] Re: TM504 Fuse Alternate




Likely a good idea to check all the B+ and B- rails to ground as well before plugin in. Don't have a schematic of the TM power unit handy but I think a test of pins 6,5,11,13 to pins 3,4 (both A and B side) should not read 0 if you know what I mean. (again from memory so please verify or await a subject matter expert to comment). especially on a plug-in of unknown heredity. such as "As-Is".* smile *



From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Robert
Sent: Wednesday, April 25, 2012 7:19 PM
To: TekScopes@...
Subject: [TekScopes] Re: TM504 Fuse Alternate





Thanks,
I think for the next PS503As I will add a test on the edge connector for shorts before I plug it in.
Bob

--- In TekScopes@..., "Rob" <rgwood@> wrote:
>
> My opinion is yes (could actually go to 1.6 *1.25 =2 amps in a fast blow and
> still be "protected enough". Said formula true to say 5 ish amps. Slow blow
> vs. fast in standard fuse packages.
>
>
>
> Not sure how I could actually guarantee said opinion though..
>
>
>
> I will offer; if something fries between now and the arrival of the correct
> fuse by following the above recommendation, ship it down here to LA and I
> will repair said damage free of charge and ship it back as well. (Best I can
> do * smile * ). I will not replace the 1.75 that will likely open and be
> replaced by the handier 2 which will serve in the pinch until the proper
> fuse arrives.
>
>
>
> Rob
>
> *Note: one time offer for Bob only on this application as it is certain my
> formula will be tweaked appropriately via continued conversation *
>
>
>
> From: TekScopes@... [mailto:TekScopes@...] On Behalf
> Of Robert
> Sent: Wednesday, April 25, 2012 6:29 PM
> To: TekScopes@...
> Subject: [TekScopes] TM504 Fuse Alternate
>
>
>
>
>
> While working on a PS503A, fuses F20 and F22 in the TM504 blew. I have fixed
> the PS503A and it tested OK in another TM504, but I don't have any spare
> 1.6A Slow Blow fuses. Eventually I will order some, but could I use a 1.75
> fast blow, which I do have, in the interim? ( I have few more PS503As to
> fix).
> Bob
>


Re: Replacing Tantalum Capacitors

HughV
 

With an R-C low pass filter in a power supply signal, two benefits are realized: 1) high frequency hash or noise on the power supply line is attenuated (primary reason for this configuration, imho) and 2) the inrush current to the capacitor is reduced (which according to this thread) thereby contributes to extended life of the (tantalum) capacitor.  The low ESR benefit of the capacitor is not compromised in this case for circuitry on the ‘output’ of this filter.  Upstream circuitry is deprived of the full benefit of the capacitor due to the resistor, but of course, this circuit is used to provide lower-noise power to the downstream circuit.

Hugh

 

From: TekScopes@... [mailto:TekScopes@...] On Behalf Of shalimr9@...
Sent: Thursday, April 26, 2012 9:06 AM
To: Tekscopes
Subject: Re: [TekScopes] Re: Replacing Tantalum Capacitors

 

 

I believe in most cases it is more appropriate to limit the current by controlling the voltage rate of rise at power up, so that you do not have to degrade the cap's otherwise low ESR with a resistor.
If the power supply's rise time is not well controlled, you may find a lot of bad tantalums.


Re: TM504 Fuse Alternate - now transistors

Jim Reese
 

Hello to all,
 
Ed is correct on the P/Ns. The flat package transistors are MJE2955/3055 TO-126 version, not the MJE2955T/3055T version (TO-220 with metal tab).
 
Per previous posts, I have these available if anyone needs some.
 
Regards,
 
Jim


--- On Thu, 4/26/12, Ed Breya wrote:

From: Ed Breya
Subject: [TekScopes] Re: TM504 Fuse Alternate
To: TekScopes@...
Date: Thursday, April 26, 2012, 10:09 AM

I believe the plastic ones (TO-126) are MJE3055 NPN and MJE2955 PNP. The TO-3s for the high power slot are 2N3055 and 2N2955. Any form of these basic transistors should work - there should be other power package options too, just look for the root numbers 3055 and 2955.

Ed

--- In TekScopes@..., "Patrick Wong" wrote:
>
> Hi Tom,
>
> I own a TM503 and TM504.  Fortunately I have not had any series-pass power transistor failures. 
>
> However, in the event of a future failure, can you or other group members recommend suitable replacement NPN and PNP transistors?  When I researched that previously it was not obvious that suitable transistors of the correct physical form-factor are still available, and I was left with the impression it may be necessary to modify the transistor's physical mounting when installing a replacement.
>
> Thanks,
>
> Patrick Wong AK6C
>
> --- In TekScopes@..., "Tom Miller" wrote:
> >
> > You should also check the power transistors in the mainframe. There is a PNP and a NPN for each slot. Since these are often used for power supply pass transistors, if any are shorted it may do harm to an otherwise good plugin.
> >
>




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Re: TM504 Fuse Alternate

 

Hi Patrick,
 
Yes, finding replacements for those transistors can be difficult. The only source I have is some transistors salvaged from a non-repairable mainframe. If you do a search through the archives, there may be more information.
 
I think these are about 90 watt transistors. The layout is E-C-B instead of the normal B-C-E. Some of the mainframes use a wired connector between the PC board and the transistor and they are easy to modify.
 
Regards,
Tom
 
 
 

----- Original Message -----
Sent: Thursday, April 26, 2012 8:16 AM
Subject: [TekScopes] Re: TM504 Fuse Alternate

 

Hi Tom,

I own a TM503 and TM504. Fortunately I have not had any series-pass power transistor failures.

However, in the event of a future failure, can you or other group members recommend suitable replacement NPN and PNP transistors? When I researched that previously it was not obvious that suitable transistors of the correct physical form-factor are still available, and I was left with the impression it may be necessary to modify the transistor's physical mounting when installing a replacement.

Thanks,

Patrick Wong AK6C

--- In TekScopes@..., "Tom Miller" wrote:
>
> You should also check the power transistors in the mainframe. There is a PNP and a NPN for each slot. Since these are often used for power supply pass transistors, if any are shorted it may do harm to an otherwise good plugin.
>


Re: TM504 Fuse Alternate

Ed Breya
 

I believe the plastic ones (TO-126) are MJE3055 NPN and MJE2955 PNP. The TO-3s for the high power slot are 2N3055 and 2N2955. Any form of these basic transistors should work - there should be other power package options too, just look for the root numbers 3055 and 2955.

Ed

--- In TekScopes@..., "Patrick Wong" <patwong3@...> wrote:

Hi Tom,

I own a TM503 and TM504. Fortunately I have not had any series-pass power transistor failures.

However, in the event of a future failure, can you or other group members recommend suitable replacement NPN and PNP transistors? When I researched that previously it was not obvious that suitable transistors of the correct physical form-factor are still available, and I was left with the impression it may be necessary to modify the transistor's physical mounting when installing a replacement.

Thanks,

Patrick Wong AK6C

--- In TekScopes@..., "Tom Miller" <tmiller11147@> wrote:

You should also check the power transistors in the mainframe. There is a PNP and a NPN for each slot. Since these are often used for power supply pass transistors, if any are shorted it may do harm to an otherwise good plugin.


Re: Spectrum analyzer ?

Jim Cotton
 


An entirely different approach to consider:

If you aren't tied to it has to be X, build a USB based test bench...

http://sdr-kits.net/VNWA3_Description.html

http://www.minicircuits.com/pdfs/PWR-4GHS.pdf

http://www.windfreaktech.com/

I have a 492, 496, and 7L12.  Just another thought.

Repairing a 7Lx module is a pain because of how much is crammed into 
such a small space...

There is a big difference between a 491 and the 492 and up SA's.  I would 
avoid the 491.

A 492+ is much easier to work on.  My $0.02.

Jim Cotton
n8qoh


From: HankC
To: "TekScopes@..."
Sent: Thursday, April 26, 2012 9:21 AM
Subject: [TekScopes] Re: Spectrum analyzer ?

 
One other approach to consider.
 
Since the 7L13 has better resolution (& sensitivity), it will cost a lot more than a 7L12 .
But, this capability makes a storage mainframe even more necessary because the required sweep speeds will be very slow.
It will also be harder to find.
 
Keep an eye out for a Tek 27xx stand-alone analyzer. Freq is 9 KHz to 1.8 GHz.
 
But, there's a 3rd choice . . . a DSO with FFT.
Assuming your ham needs are in the HF bands up to 50 MHz, a low cost DSO could do the job if you just want a transmitter monitor.
If the sample rate is at least 3-5 times faster than the RF to be displayed, it will be fine.
A scope is a good fit for transmitter monitoring & will survive excessive input power much better than an SA.
And, you can probe around in your stuff with an ordinary passive probe.
An SA will require a 50 ohm probe which is not always suitable for general probing unless it is a FET probe (fragile), which requires power.
 
And, you get a digital scope at the same time !
 
HankC,  Boston



Re: Spectrum analyzer ?

Leonard
 

A scope is a good fit for transmitter monitoring & will survive excessive input power much better than an SA.
And, you can probe around in your stuff with an ordinary passive probe.
An SA will require a 50 ohm probe which is not always suitable for general probing unless it is a FET probe (fragile), which requires power.
 
And, you get a digital scope at the same time !
 
HankC,  Boston
For general probing around, where the 50 ohm input is a real disadvantage, I take the vertical signal output of my 7904 and feed it into my HP 141 spectrum analyzer. I don't get a calibrated display but it allows me to see whats there without loading the source down.

Just another option.
Leonard


Re: 2337 Vertical Amplifier problem

Tom Jobe <tomjobe@...>
 

Hi Denis,
Your description of these transistors is not of much use to anyone trying to help you. I looked in a 233x manual and I can't figure out which transistors you are concerned about, or which PCB they are on.
Could you provide the Tektronix component numbers (Qxxx)? The component number will lead you to the Tektronix part number ( maybe a 151-xxxx-xx number).
233x scope discussions are somewhat rare on the Tekscopes group, and I think the 2337 is the rarest and most complicated of the 2335, 2336, 2337 series.  Your question might be common to all of the 233x series, so any 233x manual will probably work.
If you don't have a 233x manual, could you post some pictures that would explain which transistors you need?
tom jobe...
 
 

----- Original Message -----
From: cobra383
Sent: Thursday, April 26, 2012 1:46 AM
Subject: [TekScopes] Re: 2337 Vertical Amplifier problem

 



Hi

I thought I would try bumping this question again as I would dearly like to get my 2337 working again. I know where the fault lies but would be grateful if anyone can identify the two SM transistors marked KN and MW. Any help would be most welcome.

Thanks

Denis

--- In TekScopes@..., "cobra383" wrote:
>
> Hi
> I have a Tek 2337 100Mhz portable.
> A few years ago Ch 1 trace kept drifting up and down a few mm after it had been on a while. This was independant of the attenuator settings.
> I traced the problem to U30 a 155-0220-00 module. As these modules are plug in, I swapped over the CH1 and Ch2 modules and the fault transfered to Ch2.
> A year or so later both channels started to exhibit the same problem.
>
> I contacted Walter Sphere who kindly sent me a replacement module the state of which he didn't know and did say it could be faulty.
> Sadly it was, the trace with this module being permanently positioned off the bottom of the screen.
>
> This module came apart whilst removing it and all that is in it are 7 SOT23 transistors a couple of SMD caps and some printed resistors. I thought I would have a go at making a couple of replacement modules using standard SMD parts that wouldn't have been available when this Scope was made.
> The SOT23 transistors have a metallic looking top to them where the markings are.
>
> What I need to know is what transistors are used in the module.
> Two transistors are marked KN and 5 are marked MW.
>
> I have found a reference to KN as a BST84. Whether this is really what the device is I don't know. According to the Philips data sheet the BST84 is in a SOT89 package which isn't the same and the data sheet is dated April 1991. This must be some 10 years after the module were manufactured so is unlikely to be the correct device. I can only assume that the device markings are internal Tek numbers and not generic.
>
> Anyone know what these devices could be?
>
> Thanks
>
> Regards
>
> Denis
>


Re: Spectrum analyzer ?

 

One other approach to consider.
 
Since the 7L13 has better resolution (& sensitivity), it will cost a lot more than a 7L12 .
But, this capability makes a storage mainframe even more necessary because the required sweep speeds will be very slow.
It will also be harder to find.
 
Keep an eye out for a Tek 27xx stand-alone analyzer. Freq is 9 KHz to 1.8 GHz.
 
But, there's a 3rd choice . . . a DSO with FFT.
Assuming your ham needs are in the HF bands up to 50 MHz, a low cost DSO could do the job if you just want a transmitter monitor.
If the sample rate is at least 3-5 times faster than the RF to be displayed, it will be fine.
A scope is a good fit for transmitter monitoring & will survive excessive input power much better than an SA.
And, you can probe around in your stuff with an ordinary passive probe.
An SA will require a 50 ohm probe which is not always suitable for general probing unless it is a FET probe (fragile), which requires power.
 
And, you get a digital scope at the same time !
 
HankC,  Boston


Re: Replacing Tantalum Capacitors

Didier Juges
 

I believe in most cases it is more appropriate to limit the current by controlling the voltage rate of rise at power up, so that you do not have to degrade the cap's otherwise low ESR with a resistor.
If the power supply's rise time is not well controlled, you may find a lot of bad tantalums.

I have two Tek 494P spectrum analyzers of similar vintage. One has had already 2 shorted tantalums while the other analyzer, which is used more often, has had none.

Next time I am inside, I will check the power supply rise time.

Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...

From: David <davidwhess@...>
Sender: TekScopes@...
Date: Sun, 22 Apr 2012 22:10:10 -0500
To: <TekScopes@...>
ReplyTo: TekScopes@...
Subject: Re: [TekScopes] Re: Replacing Tantalum Capacitors

 

I have yet to find a place where Tektronix limited inrush current to
any capacitor with a series resistor. So far I have replaced or
removed two shorted tantalums. One was in a 7B92A time base and the
other was in a DM501 4-1/2 digit multimeter.

On Sun, 22 Apr 2012 19:52:54 -0700, "Dennis Tillman"
<dennis@...> wrote:

>Tantalum caps cannot withstand high inrush currents. The manufactures
>clearly state this in their datasheets. The recommended solution is to
>insert a small value resistor in series with the cap to limit the current
>surge. Tek did this everywhere they used tantalums. But I suspect most
>designers (and certainly hobbyists) did not know about the importance of
>liming the inrush current and they used a tantalum cap without a series
>resistor causing premature failure.
>
>As most of us have discovered by now the fried series resistor is the “tell”
>for a shorted tantalum cap.
>
>Dennis


WTB Tek RM-503 or ?

diane
 

Hi!!!

I am looking for a Tek RM-503 or other rack mounted audio scope...

In working, (or close to) complete condition... I need something with X-Y input, high/low sensitivity tube input for HV and low level testing of audio signals and HV power supplies, and rack mounted to fit into small space... OK, or better cosmetics are fine...

Any orphans out there that need a good home? Anything taking up too much space? I need to put one to work soon... What'ya got?

I will gladly pay all costs, and make it easy as possible...

Please contact me off forum...

Thanks for your consideration!!!!

Happy Spring!!!

Steve K LA,CA


Re: TM504 Fuse Alternate

honolulusnowwhite
 

Hi Tom,

I own a TM503 and TM504. Fortunately I have not had any series-pass power transistor failures.

However, in the event of a future failure, can you or other group members recommend suitable replacement NPN and PNP transistors? When I researched that previously it was not obvious that suitable transistors of the correct physical form-factor are still available, and I was left with the impression it may be necessary to modify the transistor's physical mounting when installing a replacement.

Thanks,

Patrick Wong AK6C

--- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote:

You should also check the power transistors in the mainframe. There is a PNP and a NPN for each slot. Since these are often used for power supply pass transistors, if any are shorted it may do harm to an otherwise good plugin.


475 CRT High voltage problems

lmaccone
 

My 475 (which I had fixed thanks to this list, thank you!) has lost
all CRT signal. Apart from that, it seems ok. All voltages are more or
less ok, except for the 110V that is around 86. I checked the power
supply stage and it looks ok (that was what had failed
previously). The 110V drives the high voltage section, and one of the
transistors there (Q1354 if you have the schematics) is heating up a
lot... I don't have the tools to work on HV and I'm ready to ditch the
unit (it's older than me!), but I'd love to fix it if possible. Any
ideas?

Thanks,
Lorenzo


Re: FS TM515 end cover

Mark Wendt <mark.wendt@...>
 

Well, here ya go Rob. ;-)

Ebay #180779224365

Mark

On 04/25/2012 08:39 PM, Rob wrote:


I have been looking (unsuccessfully) for a complete TM515. If I had only known I would have picked up a 515 awaiting the covers. My prediction is they will sale like hotcakes.

Dennis expect a personal message *smile *

*From:* TekScopes@... [ma! ilto:TekScopes@...] *On Behalf Of *Dennis Tillman
*Sent:* Wednesday, April 25, 2012 7:33 PM
*To:* TekScopes@...
*Subject:* RE: [TekScopes] FS TM515 end cover

Sadly, I couldn’t sell a complete, working, TM515 I had at the Puyallup Swap meet a month ago for $25. There was no interest at all for it on the part of the buyers. And postage would have been $0.00. Good luck selling the cover although I can’t imagine why something that would only weigh a pound or two would cost that much to ship even in Canada.

Dennis

*From:* Richard Solomon, *Sent:* Wednesday, April 25, 2012 4:08 PM


And we think our postage cost here in the "Lower 48" is high !!

73, Dick, W1KSZ

On Wed, Apr 25, 2012 at 3:45 PM, GeorgeP <@georgeplhak <mailto:@georgeplhak>> wrote:

Some might consider this message as spam, but given the rarity of the item I hoped that you wouldn't mind my trying to make you aware of one of these that I have for sale on EBay, item 221009759481

Please have a look if your TM515 needs an end cover.

Thank you.

George Plhak




Re: 2337 Vertical Amplifier problem

sigma01@btinternet.com
 

Hi

I thought I would try bumping this question again as I would dearly like to get my 2337 working again. I know where the fault lies but would be grateful if anyone can identify the two SM transistors marked KN and MW. Any help would be most welcome.

Thanks

Denis

--- In TekScopes@..., "cobra383" <sigma01@...> wrote:

Hi
I have a Tek 2337 100Mhz portable.
A few years ago Ch 1 trace kept drifting up and down a few mm after it had been on a while. This was independant of the attenuator settings.
I traced the problem to U30 a 155-0220-00 module. As these modules are plug in, I swapped over the CH1 and Ch2 modules and the fault transfered to Ch2.
A year or so later both channels started to exhibit the same problem.

I contacted Walter Sphere who kindly sent me a replacement module the state of which he didn't know and did say it could be faulty.
Sadly it was, the trace with this module being permanently positioned off the bottom of the screen.

This module came apart whilst removing it and all that is in it are 7 SOT23 transistors a couple of SMD caps and some printed resistors. I thought I would have a go at making a couple of replacement modules using standard SMD parts that wouldn't have been available when this Scope was made.
The SOT23 transistors have a metallic looking top to them where the markings are.

What I need to know is what transistors are used in the module.
Two transistors are marked KN and 5 are marked MW.

I have found a reference to KN as a BST84. Whether this is really what the device is I don't know. According to the Philips data sheet the BST84 is in a SOT89 package which isn't the same and the data sheet is dated April 1991. This must be some 10 years after the module were manufactured so is unlikely to be the correct device. I can only assume that the device markings are internal Tek numbers and not generic.

Anyone know what these devices could be?

Thanks

Regards

Denis


Re: 7A13 odd symptom: relays?

GeorgeP
 

When you find the bad one, let us know the tek pn.

George

--- In TekScopes@..., "froggiegremlin" <crypto-museum@...> wrote:

Hello all: It is indeed the notorious white TEK relays.

The ones in the CH 1 attenuator are behind a switch bracket so hard to pull out
and VERY hard to replace.

I have several modules and was swapping relays around. Apparently, the DPDT
relays come in 3 flavors, which seem to be just pin clipping variations.

No amount of relay permutation between 3 plugins seems to fix it, and its not
trivial to pinpoint the bad relay(s).

My next plan is to gather all of them, sort by type and make a test and burnin
fixture to try to recondition failed contacts.

Anyone find a modern substitute for these?

Cheers,

Jon

-73-

NNNNNN


Re: 7A13 odd symptom: relays?

 

I have not tried it yet but the DPDT relay I linked has the same pin
spacing so it is possible that the socket in the 7A13 could be rewired
to accept it directly. All of the other relays I checked had a wider
pin spacing.

On Wed, 25 Apr 2012 17:47:58 -0700, David Wise
<david_wise@...> wrote:

The DPDT on the 7A11 page below is $3 at Mouser, part number 655-V23079D2003B301 .
Sounds like a plan to me.

Dave Wise

-----Original Message-----
From: TekScopes@...
[mailto:TekScopes@...] On Behalf Of David
Sent: Wednesday, April 25, 2012 4:37 PM
To: TekScopes@...
Subject: Re: [TekScopes] Re: 7A13 odd symptom: relays?

When I need to replace one of the DPDT ones, I will try this:

http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A11.htm


Re: FS TM515 end cover

Jim Elliott <jimafm@...>
 

Want to sell that TM515?


--- On Wed, 4/25/12, Dennis Tillman wrote:

From: Dennis Tillman
Subject: RE: [TekScopes] FS TM515 end cover
To: TekScopes@...
Date: Wednesday, April 25, 2012, 8:32 PM

 

Sadly, I couldn’t sell a complete, working, TM515 I had at the Puyallup Swap meet a month ago for $25. There was no interest at all for it on the part of the buyers. And postage would have been $0.00. Good luck selling the cover although I can’t imagine why something that would only weigh a pound or two would cost that much to ship even in Canada.

Dennis

 

From: Richard Solomon, Sent: Wednesday, April 25, 2012 4:08 PM

And we think our postage cost here in the "Lower 48" is high !!

73, Dick, W1KSZ

 

On Wed, Apr 25, 2012 at 3:45 PM, GeorgeP <george@...> wrote:

Some might consider this message as spam, but given the rarity of the item I hoped that you wouldn't mind my trying to make you aware of one of these that I have for sale on EBay, item 221009759481

Please have a look if your TM515 needs an end cover.

Thank you.

George Plhak