Does anyone have the winding data for the 561 HV transformer? The manual shows it to be Tektronix part 120-225. thanks
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Re: Tek 576 Curve Tracer wanted: Max Peak Volt / Series Resistor mechanical linkage & knobs & Multiplier pot bezel / fixture collar
Rick,
I cannot help with the first item.
Speaking to the second item. The offset pot is held by a plastic cup which is affixed behind the knobs of the pot. This plastic part is not available, except by pure luck or good fortune. I had to actually make one for my Type 576 on my lathe from a block of Delrin nylon. It takes quite some time to duplicate this part, but it can be done.
Best of luck in your search.
--
Michael Lynch
Dardanelle, AR
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Tek 576 Curve Tracer wanted: Max Peak Volt / Series Resistor mechanical linkage & knobs & Multiplier pot bezel / fixture collar
hi,
Does anyone know about the following mechanical bits on 576 CT front panel ?
a) Max Peak Volt / Series Resistor linkage mechanism:
I am missing the dual knobs for this & the mechanical (coaxial ?) linkage that extends about 2" behind the front panel to the actual rotary switch inside.
-- Does anyone have a spare linkage unit with the two outer knobs or a detailed diagram of this ?
b) The Multiplier Pot with its silver fine gradation knob:
my Multiplier Pot has been pushed in all the way, hanging inside the instrument !
-- How is this Pot re-afixed to the front panel ?
Is there a retention ring, bezel, collar or something ?
-- Does anyone have these bits or a detailed diagram ?
thank you,
rick
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Re: Tektronix 585A Voltage Diagnoses Problem edited
Hi Randolph,
You checked all the tubes, but also the voltage reference tube V609? Should measure about 85 V.
The grid voltages of V 624 should be approximately equal, well within 1 V or so.
The voltage at the grids should be what you expect from the divider R615/616/617 with "your" -150V.
If the fault is elsewhere then likely you will find grid pin 7 far too negative and pin 6 (anode) far too positive, almost at "your" +100V. Then continue with V634.
Is the screen voltage about normal (not very negative)?
And so on (for now).
Albert
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Re: Q: covers for 555 power supply?
Sorry Jim. Try this url . This is his store. His email is mercedesmann at
Yahoo dot com.
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Re: 2247A PSU Troubleshooting
Chuck,
The only use of the linesman glove was to put the HT anode lead somewhere that would hold it from moving, and to keep it away from me. I never implied to wear them while working in electronics, they also have a leather shell glove to protect the linesman glove from damage.
But I do use latex gloves when doing this work, I'm not relying on them to protect me, but rather to add a weak safety net, since I have them lying around, they improve grip, and add a decent layer of uncertified protection, but they tear easily.
This reply is a little dated I know, haven't been following the thread for awhile.
NielsenTelecom
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Re: 11801C and the T1331 error: lost factory TB calibration data.
Mine has it and it's documented in the 11801 user and service manuals. The user reference manual on p 42 says:
"The signal from the calibrator output is a 250 mV square wave with a rise time of approximately 20 ps and a period of approximately 10 us."
I did a lot of work with it and my SD-26s until I found the SD-24. It was what go me hooked.
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Re: 2213A Novice, unsolved anomaly encountered, documented & video
Thank you for sharing your experiences!
toggle quoted message
Show quoted text
On Mon, Aug 26, 2019 at 12:38 PM guy232 <gry.russel@...> wrote: Apologies for the delay in updating, was a bit under the weather.
Months ago I initially used a 5x mag lens to investigate the solder joints
in the PS areas. Didn't see any issues.
Last week when I got back to working on this, I remembered I had a cheap
$20 usb microscope laying around.
Discovered very tiny cracks on all 3 pads on both Q946 and Q947. C907 had
crack on the component side of the board (the bottom was not cracked)
hosted pics of cracks:
IPA scrubbed, dried, applied some amtech flux and reflowed the joints.
Also swapped out C956, I was using the original mallory cap due to
ordering the incorrect cap the first time. Used a new Nichicon UHW 330uF
50V that I had on hand. I seen that C956 is listed as +10-100% and believe
this is a workable low impedance choice. If not, i'd appreciate any insight
on the matter.
Powered up, the shrinking H and V issue
and extreme intensity change fail states no longer occurs. The only fault
that I notice is that the traces just barely pulse brightness (as if you
were just barely turning the intensity knob by 1-2 degrees back and forth)
after 3-5min, they remains steady for until powered down.
Going to microscope a bit more and use a long wooden dowel to gently tap
around while the unit is running as David Hess mentioned on my project
thread on eevblog.
P.S.: Just adding a link to the project thread on eevblog in case it helps
anyone in the future etc.
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Re: 2213A Novice, unsolved anomaly encountered, documented & video
Apologies for the delay in updating, was a bit under the weather.
Months ago I initially used a 5x mag lens to investigate the solder joints in the PS areas. Didn't see any issues.
Last week when I got back to working on this, I remembered I had a cheap $20 usb microscope laying around.
Discovered very tiny cracks on all 3 pads on both Q946 and Q947. C907 had crack on the component side of the board (the bottom was not cracked)
hosted pics of cracks:
IPA scrubbed, dried, applied some amtech flux and reflowed the joints.
Also swapped out C956, I was using the original mallory cap due to ordering the incorrect cap the first time. Used a new Nichicon UHW 330uF 50V that I had on hand. I seen that C956 is listed as +10-100% and believe this is a workable low impedance choice. If not, i'd appreciate any insight on the matter.
Powered up, the shrinking H and V issue
and extreme intensity change fail states no longer occurs. The only fault that I notice is that the traces just barely pulse brightness (as if you were just barely turning the intensity knob by 1-2 degrees back and forth) after 3-5min, they remains steady for until powered down.
Going to microscope a bit more and use a long wooden dowel to gently tap around while the unit is running as David Hess mentioned on my project thread on eevblog.
P.S.: Just adding a link to the project thread on eevblog in case it helps anyone in the future etc.
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Re: Tektronix 585A Voltage Diagnoses Problem edited
Hi Randolph,
There is no reason to expect the plugin would pull the voltages off
their mark.
Get the -150V right and everything else should fall into line.
-Chuck Harris
randolphbeebe@... wrote:
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Hi Chuck,
The scope has a CA plug-in right now with a type 81A adapter. I am pretty sure all is good with the plug-in because the scope responds to the vertical position and input etc. I have a couple of the Type 81A adapters, I wonder if the present one may be causing problems.
Thanks for the
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Re: parting out 2) 7633's and a 7613 storage scope unless... $55 shipping each in US
Where do you have this stuff at?
NielsenTelecom
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Re: Tektronix 585A Voltage Diagnoses Problem edited
Thanks Roy,
My 585A does not have the black beauties but the red Erie caps that tested good in circuit. I replaced them all anyway this morning just in case there was cumulative leakage problems. No improvement yet so I will keep digging. I will post a schematic when I figure out how to.
Randy
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Re: Tektronix 585A Voltage Diagnoses Problem edited
Hi Chuck,
The scope has a CA plug-in right now with a type 81A adapter. I am pretty sure all is good with the plug-in because the scope responds to the vertical position and input etc. I have a couple of the Type 81A adapters, I wonder if the present one may be causing problems.
Thanks for the
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Re: Tek P6xxx probe reference question
Hi Dennis,
What I found in an accurate dimension for the probes is the diameter of the metal on the removable (replaceable) probe tip. Example - the P6137 (p/n 206-0378-00) is an accurate 3.5mm diameter.
I won't put good money on it but any other dimensions of the probe plastic parts is far too large.
I did come across a current link at the Tek site that covers probe replacement parts. It is at (selections at far right side of page). It seems to cover a fair cross-reference between probe models and diameters. You can also click on the scrunched diagram of the probe parts to expand to a
readable size. I saved the enlarged diagrams to a "Tek Probes" folder and PDF'd each page as well. You can never tell when things like this will disappear.
Part numbers and such for those items (i.e. probe tips, cables comp boxes) not called out on the probe-size-specific pages can be found on the first page by clicking on the link "Passive & Active Probe General Replacement Parts." It cross-references parts by each probe model number.
In all this brings all of the data on the probes together. I think I have all of my questions answered.
Thanks,
Greg
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Re: Tek P6xxx probe reference question
The full set of Tektronix catalogs are available in PDF form online at the TekWiki and other sites
They are very useful for determining specs, prices and when the various instruments were offered.
Dave
Sent from a small flat thingy
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Show quoted text
On Aug 26, 2019, at 09:30, Richard Tyner <shawneesdad@...> wrote:
Hi Dennis. I don't have a catalog to see the probe pages you refer to in the last line in your post. By any chance could you please add them as a downable file? I have multiple probes and this would be very helpful.
Thanks and 73
Richard W4MCD
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FOUND (Re: WTB - Tektronix P6406 Word Recognizer Probe)
I found a P6406 last night. Thanks to everyone who replied. - Bill
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Re: Tek P6xxx probe reference question
Hi,
Perchance a Probewiki on the Tekwiki page?
larry
toggle quoted message
Show quoted text
On Aug 26, 2019, at 9:30 AM, Richard Tyner <shawneesdad@...> wrote:
Hi Dennis. I don't have a catalog to see the probe pages you refer to in the last line in your post. By any chance could you please add them as a downable file? I have multiple probes and this would be very helpful.
Thanks and 73
Richard W4MCD
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Re: Tek P6xxx probe reference question
Hi Dennis. I don't have a catalog to see the probe pages you refer to in the last line in your post. By any chance could you please add them as a downable file? I have multiple probes and this would be very helpful.
Thanks and 73
Richard W4MCD
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Re: FG502 Troubleshooting Help Requested
The charging and discharging currents for the timing capacitor have to pass through the switching circuitry of S155 so bad contacts there will stop the triangle generator working and the other waveforms all depend on the triangle generator. Measure the voltage drops across each of R140 and R175, this would show that the constant current sources are OK. Try this on different ranges since the current varies with the frequency range. The two voltage drops should be very similar. Measure the voltage at the junction of CR140/CR170 and at CR145/CR175, this shows whether the timing capacitor should be charging or discharging. Check that when you change the frequency dial the voltages at the outputs of U140 and U175 vary smoothly and approximately mirror each other, that should rule out a problem with the op-amps.
It sounds like you have a scope so monitor the emitter of Q210 while changing the frequency multiplier knob back and fore, you might see the occasional burst of activity even with poor contacts on S155.
There could also be a problem with the circuitry for externally gating the triangle generator, if Q315 is socketed you could remove it since it should be non-conducting in normal non-gated operation.
Roger
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Re: 11801C and the T1331 error: lost factory TB calibration data.
Reg,
If you are out for exotic toys, try finding 1180x or CSA803x with fast calibrator.
You can tell it apart visually by the calibrator jack being gold 3.5mm type instead of Nickel plated SMA.
It's basically a TDR part of SD-24 in a separate enclosure used instead of regular calibrator.
They are rare but not unique. Here's random example
I have never found who and why did this and why this is not documented anywhere.
Leo
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Mlynch001
John Williams
guy232
bill K7WXW