开云体育

I know this is not the natural place for this request, but perhaps there are like minded people here?

Does anybody here have a copy of the boot code disk for the B&K 2012 analyser?

My unit has lost its memory after some years in storage.

The hardware is in good shape.

Any help would be appreciated.

Please contact me off list

Pete
G4GJL

Thank you for the information. I will look into GOTEK. I think that is the easiest option.
thank you David !

Hi:
I am using CT-71 currently!
I may take some pictures for your references.
Rd
Tony Cheung
Feb 3 2025
从我的颈笔丑辞苍别传送

Annoyingly, any CT-71 test fixture seems impossible to find.

On Sun, 2 Feb 2025, 23:04 Sam Reaves via groups.io, <sam.reaves=
[email protected]> wrote:

Hello,

I am looking for the TO-66/TO-3 combination test fixture for the
Telequipment CT-71 Semiconductor Curve Tracer.

If I can't find one I would also like to have internal and external
pictures of one so I can make one. The pictures I have found on-line are
inadequate and the schematic
in the manual does not show either of the two fixtures that came with the
unit. I do have the TO-5 fixture and note that there are componets under
the bottom cover of the
fixure so I suspect tha the TO-66/TO-3 fixture may be similar.

The Tek part number for the fixture is:

013-0119-00

Thank you very much,

Sam
W3OHM

Nice lot Bill. Makes me wish that I had a need. Just want to remind you (and everyone) of the test equipment for sale group as well as this one.

pac1085 beat me to it . . . use the MT200 --> TO-3P adapter and new output devices.

Hello,

I am looking for the TO-66/TO-3 combination test fixture for the Telequipment CT-71 Semiconductor Curve Tracer.

If I can't find one I would also like to have internal and external pictures of one so I can make one. The pictures I have found on-line are inadequate and the schematic
in the manual does not show either of the two fixtures that came with the unit. I do have the TO-5 fixture and note that there are componets under the bottom cover of the
fixure so I suspect tha the TO-66/TO-3 fixture may be similar.

The Tek part number for the fixture is:

013-0119-00

Thank you very much,

Sam
W3OHM

These are equipment accessories for which I no longer have the original test equipment, mostly from Tektronix, with a few from HP or Aglient.? Some notes:?

1. accessories with the notation "NOS" are unused, still in their original packages, including their probe leads and so on.
2. accessories with the notation "working" have been tested for basic functionality on a 350MHz oscilloscope.
3. accessories without the notation "working" are sold as-is because I don't have a way to currently test them.
4. oscilloscope probes do not come with grounds, probe clips, or other add-ons unless explicitly noted.
5. accessories are all in good mechanical condition. the older stuff has the usual knicks and scratches.
6. prices do not include shipping costs, which I will add to the purchasse price when I have your address.
7. accessories are grouped, with a price for the lot given. Sorry but I am not interested in breaking the lots up.?
8. acceptable payment methods are Zelle, check, USPS money order, and (reluctantly) Paypal family and friends. Checks and money orders must clear before shipping.
9. buy two groups and take a ten percent discount
10. buy it all and take a twenty percent discount

Shipping will be from Portland, Oregon and limited to domestic buyers. Given the current turmoil in the United States, customs and overseas shipping is a non-starter for now.

My contact information is on QRZ.com under my amateur radio call sign, K7WXW: ? ?

Thanks,
Bill



TEKTRONIX ACCESSORIES

price for group: ?80
(4) 012-0747-00 and 020-720-00 logic analyzer probe test lead set (NOS) - in original bags with probe adapters, grounds, probe clip
(1) 012-0747-00 logic analyzer probe test lead set
(1) 020-720-00 probe adapters (NOS) - in original bags

price for group: shipping
(6) 015-0580-00 pocket signal generator

price for group: ?50
(1) 012-1372-00 tekprobe interface cable

price for group: ?50
(1) S-3A sampling head (SN B041187)
(2) 012-0130-00 sampling head interface cable

price for group: ?200
(1) 013-0098-01 transistor curve tracer fixture
(3) 013-0124-00 integrated circuit curve tracer fixture
(2) 013-0101-00 TO-66 curve tracer fixture

price for group: 100
(1) 067-0608-00 overdrive recovery calibration fixture
(1) 067-1341-00 risetime limiter
(1) 067-0554-00 tunnel diode pulser
(1) 067-0562-00 P6046 input adapter
(1) 067-0538-00 input RC normalizer
(2) 011-0081-00 termination/feedthrough
(1) 067-0569-00 ? ?sweep attenuator
(1) 015-0168-00 displacement transducer
(1) 067-0969-00 tape head alignment module

price for group: ?200
(5) P6122 100MHz probe (working)?
(2) P6105A 100Mhz probe (working)
(2) P6062B 100MHz probe (working)
(1) P6109B 100HMz probe, NOS (working)

price for group: ?180
(4) P6109 150MHz probe, one NOS (working)
(2) P6053B 200MHz probe (working)
(3) P6106 250MHz probe (working)

price for group: 225
(2) P6135A 150MHz differential probe (working, black tip, with ground cable)

price for group: 160
(2) P6134 300MHz probe (working)
(2) P6134 300MHz probe (working, no probe tip)

price for group: 60
(3) 119-1164-00 bias return

HP AND AGILENT ACCESSORIES

price for group: shipping
(1) HP 8495H attenuator (sma, programmable)

price for group: shipping
(1) Agilent 16752A logic probe cable set (4 pods)

price for group: shipping
54003A(2) HP 54003A probe pods

On Sun, Feb 2, 2025 at 02:39 PM, Karin Johnson wrote:

ronix curve tracers, would be willing to run a series of tests comparing the
so called replacements against the original types???? I would send the batch
of transistors to you to evaluate. That would at least give me some hope that
I can use somewhat original parts to facilitate the repair. I have spoken to a
person who has been down this road before and they have indicated that even if
I were to use the knock of type of transistor, the amplifier would probably
work for a few months and probable die the same type of d

I am in New York and have a 576. Can you share your detailed test plan that you would be looking for the person to execute on these devices? Maybe you want someone with more than a curve tracer, to measure transition frequency, etc?

And... I know you don't want this answer but:
I wouldn't spend any time on this unless the MT-220 devices you were looking to swap in were pulled out of a known working amp yourself (they were used in a lot of BPC so maybe you can find a cheap amp to salvage them from?).
A friend of mine sells nice MT-220 to TO-3P adapters on eBay for $2 each. (other style here: ) - if this was my amp I'd feel much more comfortable using those and buying genuine semiconductors from digikey/mouser.

Karin, what's the amplifier model,transistors?

Most eBay transistors are pulls or Chinese commie junk.

Careful examination of the part photo can reverse the provinence

Rather than a curve tracer, just a simple DC test with a variable PS and meter can show the Vcbo, B etc.

We 576 with all fixtures, but are far from yours.

Andy in Tallahassee area maybe has a Tek curve tracer.

Send a PM I can inquire and pass on his information.

Kind Regards

Jon

Hey Karin,

I'm in Montreal, Quebec, and I have a 577 that's good for comparative
measurements at least. I need a pretext for calibrating the thang, so this
could be it. Sadly your transistors would likely be taxed on entry and
tariffed both ways, so hopefully you find someone more local to help you.

Siggi

On Sun, Feb 2, 2025 at 3:29?PM Karin Johnson via groups.io <karinann=
[email protected]> wrote:

Oh sorry about that.
I am located in West Central Florida USA
By the way if anyone wants to volunteer, it does not have to be local.
I will handle all shipping expenses, both ways.

Karin

Oh sorry about that.
I am located in West Central Florida USA
By the way if anyone wants to volunteer, it does not have to be local.
I will handle all shipping expenses, both ways.

Karin

You might be seeing the results of your digitizing scope sampling near to the peak and sometimes but not always at the peak of the time marks. Try running a faster sweep speed (smaller time/div) on the digitizing scope so that you view only one time mark or at least the rising edge and the peak. The objective is to capture the signal with a lot of samples at and surrounding the peak. If your digitizing scope has and envelope or something resembling variable persistence, use it to display the variations in successive waveforms. This should allow you to view the excursion of any modulation or noise without the influence of undersampling the peak. If the signal has only a little noise, the low persistence of the analog scope and your eye will reduce the small influence of the noise.

Hey Karin,

It would probably help if you tell us approximately where in the world you
live. Best case you'll find someone local to you.

Siggi

On Sun, Feb 2, 2025 at 2:39?PM Karin Johnson via groups.io <karinann=
[email protected]> wrote:

Kind of an unusual request to the group. I am repairing a 300 watt stereo
amplifier, and found a bunch of bad high power output transistors during
the debug process. All of these transistors are no longer produced, and
also the package style (MT200) is no longer being produced.
I don't wish to modify the mechanical assembly to use modern
replacements. I have found a source of supposedly replacement transistors
which carry the same part number and package style. The problem is that
many of these transistors have be "bastardized" and being sold as original
spec. Many of them are not. If one had a curve tracer you could compare
the so called replacement with the original type, of which I have several.
My request is this. Is there anyone in this group who owns one of the
Tektronix curve tracers, would be willing to run a series of tests
comparing the so called replacements against the original types???? I
would send the batch of transistors to you to evaluate. That would at
least give me some hope that I can use somewhat original parts to
facilitate the repair. I have spoken to a person who has been down this
road before and they have indicated that even if I were to use the knock of
type of transistor, the amplifier would probably work for a few months and
probable die the same type of death.
What say the assembled masses????
Regards,
Karin Anne Johnson P.E. K3UU

I've begun to go through the calibration process on the Tek 570 I picked up last summer. It's an early model, S/N 169. It works well but I wanted to give it a once over since I have no idea how long ago it was last calibrated.

For some reason the floating supplies, +400v and -300v are both reading high; +446v and -350v

The manual says the must be within 5% of the proper voltage, so these are out of spec. Im performing my tests with line voltage set to 117vac per the manual. I confirmed that the transformer is properly wired for 117v.

I have the front panel controls set per the manual. I tested the 6ax5 and 6x4 rectifiers, both sections strong on both. The 80uf electrolytics were already replaced with modern parts by the previous owner.

Any ideas? You can see in my pic (assuming I can figure out how to attach it) that the secondaries on the transformer are reading a bit high for both sections in question - but not too bad. (the 325-0-325 for the +400v 6ax5 is reading 342-0-342 and the 250-0-250 for the -300v 6x4 is reading 265-0-265)

I checked the diagram for the unregulated transformer at VintageTek, p/n 120-0069-00 to confirm that it was indeed made for 117v. Anyways, lowering to 115v doesn't bring it into spec - have to go all the way down below 110v.

I plan to start looking downstream and see if something's not pulling enough current, but figured I'd get this post started now.

Thanks,
Phil

Kind of an unusual request to the group. I am repairing a 300 watt stereo amplifier, and found a bunch of bad high power output transistors during the debug process. All of these transistors are no longer produced, and also the package style (MT200) is no longer being produced.
I don't wish to modify the mechanical assembly to use modern replacements. I have found a source of supposedly replacement transistors
which carry the same part number and package style. The problem is that many of these transistors have be "bastardized" and being sold as original spec. Many of them are not. If one had a curve tracer you could compare the so called replacement with the original type, of which I have several.
My request is this. Is there anyone in this group who owns one of the Tektronix curve tracers, would be willing to run a series of tests comparing the so called replacements against the original types???? I would send the batch of transistors to you to evaluate. That would at least give me some hope that I can use somewhat original parts to facilitate the repair. I have spoken to a person who has been down this road before and they have indicated that even if I were to use the knock of type of transistor, the amplifier would probably work for a few months and probable die the same type of death.
What say the assembled masses????
Regards,
Karin Anne Johnson P.E. K3UU

LATE UPDATE; During the 'thought' process of connecting to my SA, I thought I’d first take a peek with a 485-analog scope. Lo and behold, everything appeared to work as expected. The timing was as close as I could hope, and levels were very close. From the ‘Marker Output’ and from the ‘Trigger Output’, the marker signals and the trigger signals, all were there. This started a head-scratching session… I’m assuming the bandwidth, of the HP 54542C, along with being digital simply shows more artifacts.

I appreciate that I’m old school and have countless more hours on analog scopes, so I’m still getting used to the 54542C along with various Rigol jobbies I have. I understand, er, at least hope I understand the reason why digital scopes show more ‘fuzz’ on the screen than the smooth trace of an analog scope, and I’m assuming the detail I was seeing is related. Just a character of the ‘Type’ of oscilloscope.

At any rate, things look great on any analog scope I have, e.g. from 7000 series, 2000 series, or 400 series, the marker tics all look just as expected. On the flip side, all my digital jobs show the noise. So, I think I’ll sit down with a cup-o-joe and catch up on how analog vs digital scopes differ (again). If anyone has thoughts about this I’m very open to learning ~!~

Ed,

I attempted to get the guts of the multiplier out without success. The filler is too hard to remove. What does come out is fine powder. The parts will make any removal of the filler that much harder. There is a pc board someone made online that gives the dimensions and layout for making a replacement. A plastic box is used that a place like Hammond or Bud makes works. The diodes should be the 100mA 15kv very fast switching types. The ceramic condensers would be 2200 or 3300mmfd. The only thing useful from bad multipliers is the high voltage lead with the white end. The filler breaks down over time and high voltage making it leak or arc. I suspect James's multiplier is starting to break down by his description.

Mark

On Sat, Feb 1, 2025 at 03:49 PM, Benjamin Badrakh wrote:
Benjamin,

Thanks for the help!

Can you verify that pin 13 of U2170 is low when the channel switching is set
to CH1? Pin 2 should be high.

Pin 13 is low and Pin 2 is high.

The junction between R2176 and R2275 should be -5V in this position too.

The junction between R2176 and R2275 -is 0V. (The switch is working, -5 on both sides.)

Pin 3 of P1570 should be at +5V as well.

Pin 3 is at +5V.

Check if the voltage at the anode of CR1457 changes when switching between ch1
and ch2. Same with the collector of Q1555.

The anode of CR1457: CH1=-0.65, CH2=-0.37
The Collector of Q1555: CH1=+1.12, Ch2=+1.01

Again, thank you!

Barry

Hi,
I am trying to revive a bricked TDS540 that refuses firmware updates.
There are useful troubleshooting diagrams in the TDS520 Component Level Diagnostic and Repair Manual Vol 2 available on TekWiki.
I suspect that the Byte Decoder PAL U1048 is defective ( signal LLBE irregular ).
The Byte Enable Decoder Troubleshooting Procedure refers to a diagnostic called cpuDRAMMem diagnostics, that is not part of this volume.
The equations of the U1048 PAL are listed on " Table 6-22 ".

Where can I find this information ?
Are they part of a "Vol 1" ?

Any help / hint is welcome !

Thanks
Hans