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Re: let's bring this back to life Re: Tektronix 453 high voltage problem
I believe microwave oven HV diodes will be too slow to use for the HV diodes in a scope. The scope HV inverter runs at 20 kHz or more. The oven diodes are used at 60 Hz and their reverse recovery time may be way too slow.
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Regards ----- Original Message -----
From: "william_b_noble" <william_b_noble@...> To: <[email protected]> Sent: Monday, June 11, 2018 1:50 AM Subject: [TekScopes] let's bring this back to life Re: Tektronix 453 high voltage problem I decided to dig into an early 453. Interestingly it does not match the schematics for the 453 or the 453A - some boards seem closer to the A, some to the earlier one - for example the Z axis board is clearly dated (C) 1965, but its layout matches the board found in the A manual (unless I'm just loosing my mind). This scope sat around for several years after I got it and never plugged it in - when I did plug it in there was initially no light on the CRT (except the scale illuminator) - as I messed with it for about an hour trying to make sure what was wrong, it fired up and showed a spot and vertical deflection, I could center it, but there was no trace. then it stopped. The HV circuit is one of those that will stop oscillating if there is an overload, so it's hard to troubleshoot, and harder without an HV probe. But it's clear that something is overloading the circuit. If I disconnect the cathode and grid bias circuits, it makes HV and powers the CRT filament just fine. I've tried all sorts of things, one at a time, and disconnecting the .015uf 3Kv capacitors by itself doesn't work, disconnecting the diode that drives the grid string does let it work, and the list goes on. I've come to the conclusion without a good way to verify it that it is most likely that at least one of those 3KV ceramic caps is leaky, and if one is bad, the others are probably not far behind, so I've ordered some. The HV diodes are also suspect, though they both seem to act like diodes at 115V (with a 10 W lightbulb as the load), I ordered some microwave oven diodes just to be on the safe side. I don't think my 1M CRT Grid Bias control is bad like was found upthread, when the power supply works, I can adjust the grid bias. But now, if the supply oscillates the current can rise to about 2.9 amps (it's fused at 2 amps) with all the loads connected. The transformer isn't potted, so I think it's probably not the issue. anyone care to offer some advise on something I could have missed? I'd like to get this scope working just to say that I did it - I have a couple of newer ones to look at next, I figured this one first, it's all discretes, how hard could that be >>> |
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let's bring this back to life Re: Tektronix 453 high voltage problem
I decided to dig into an early 453. Interestingly it does not match the schematics for the 453 or the 453A - some boards seem closer to the A, some to the earlier one - for example the Z axis board is clearly dated (C) 1965, but its layout matches the board found in the A manual (unless I'm just loosing my mind). This scope sat around for several years after I got it and never plugged it in - when I did plug it in there was initially no light on the CRT (except the scale illuminator) - as I messed with it for about an hour trying to make sure what was wrong, it fired up and showed a spot and vertical deflection, I could center it, but there was no trace. then it stopped. The HV circuit is one of those that will stop oscillating if there is an overload, so it's hard to troubleshoot, and harder without an HV probe. But it's clear that something is overloading the circuit. If I disconnect the cathode and grid bias circuits, it makes HV and powers the CRT filament just fine. I've tried all sorts of things, one at a time, and disconnecting the .015uf 3Kv capacitors by itself doesn't work, disconnecting the diode that drives the grid string does let it work, and the list goes on. I've come to the conclusion without a good way to verify it that it is most likely that at least one of those 3KV ceramic caps is leaky, and if one is bad, the others are probably not far behind, so I've ordered some. The HV diodes are also suspect, though they both seem to act like diodes at 115V (with a 10 W lightbulb as the load), I ordered some microwave oven diodes just to be on the safe side. I don't think my 1M CRT Grid Bias control is bad like was found upthread, when the power supply works, I can adjust the grid bias. But now, if the supply oscillates the current can rise to about 2.9 amps (it's fused at 2 amps) with all the loads connected. The transformer isn't potted, so I think it's probably not the issue.
anyone care to offer some advise on something I could have missed? I'd like to get this scope working just to say that I did it - I have a couple of newer ones to look at next, I figured this one first, it's all discretes, how hard could that be >>> |
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Re: Off Topic: Wanted Spectracom 8212 Chart Recorder Manual
Hi Jim,
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Thanks but this seller is pretty typical of those selling manuals. This particular Spectracom manual has been unobtanium for over 10 years that I am aware of. Periodically I search the internet again in hopes that one will show up or that a member of TekScopes might point me to a source who has this specific manual (Spectracom 8212 Chart Recorder) I am asking about, not a seller of readily available manuals such as the Tek and HP manuals that tigertechus has. Virtually all of this sellers manuals are probably available for free on the many download sites that host electronics manuals such as BAMA. Dennis Tillman W7PF -----Original Message----- -- Dennis Tillman W7PF TekScopes Moderator |
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Re: Off Topic: Wanted Spectracom 8212 Chart Recorder Manual
Dennis there is a guy selling manuals on Ebay that has aquirred a large inventory of older Tek and HP manuals and he might have what you need his user name is tigertechus he even had some manuals for the testing Tek stuff for test and calibrating boxes i got.
Jim Olson |
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Re: OT: AT5005 spectrum analyzer display
You have the one on hand are Chinese type CRT , may not direct replacement .
Tony From: Ed Breya via Groups.Io <edbreya@...> To: [email protected] Sent: Monday, June 11, 2018 10:56 AM Subject: Re: [TekScopes] OT: AT5005 spectrum analyzer display The HM5010 manual schematics shows the CRT is D14-364, which googles out to be very common, and Hameg uses it in some of there other products. Ed |
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Re: Off Topic: Wanted Spectracom 8212 Chart Recorder Manual
This is also off topic I am a new comer to the site and also getting into Tek o'scopes have picked up some dead 400 scopes to play with.
Found this site by browsing for info, manuals etc. and i have noticed that most of the folks on here are Ham Radio license operators. Is this a requirement to play with the older Tek scopes or just a coincidense as one would be handy setting up receivers and transmitters as I recall from my radio and electronics classes in High School back in the dark ages. i actually had a complete radio set from a WW II Grumman TBM with all the tuning boxes and the Dynamoter ran it off a pair of 12v batteries. Never got my license back then as it was really complicated for a high school kid got it to use in my involvement with the CAP also my pilots license. have always loved working with electronic busy stuff so I will have fun testing, trouble shooting and repairing these things. Just a little back ground have been a gear head forever plus amature IT type guy did 17yrs in the Navy air reserve as a Aircraft Electrician on various planes ending with the FA-18. Enough for now Jim Olson AE1ret. |
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Re: OT: Old ICs for sale
Well, the seller seems a bit full of himself and full of hyperbole: "...while I’d wager every last chip is good, ..., they are sold as-is."
In other words, "I'll engage in a bit of puffery and unsupported claims, and then disclaim all that by selling them as-is." If he won't guarantee them, he's not really willing to wager that "every last chip" is in fact good, is he? I suppose that for $55 there probably is some value in that offering even if some of the chips are dead. I do have to chuckle since I have some of the same stuff as NOS in my parts drawers and amongst the boxes I've inherited from others. Never really considered the possibility that any of it had value. "There's gold in them there drawers!!!!" |
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Locating repair parts for P6131 probe(s)
I'm wondering if anyone has a suggestion for replacement parts sources besides looking on eBay.
I received four Tek P6131 probes all in the same condition with a 2432 I purchased. The BNC connector/Compensation box, and the cable are fine. The Probe Tip/Hybrid Tip is in rough shape (some are slightly bent, others are dented.) there is nothing else. No tip, no ground lead or place to connect it, no body. I have the part numbers from the manual and have googled them, but even the Tek web site doesn't seem to have a way to purchase individual parts. Ebay had a few of the pieces but not everything and not as many as I need. I'd really hate to buy another set of probes (and consequently sell or part these out) when I have what is a good start to a set of probes for this scope. Anyone have a suggestion as to how to find the parts I need? Regards, Grant Hopper |
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Re: Off Topic: Wanted Spectracom 8212 Chart Recorder Manual
Hi Ed,
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Yes, if you connect all three windings together you do get about 67VAC (25VAC + 25VAC + 17VAC) but that is not 110VAC by any stretch. You have an intriguing idea if the plugin did actually plug into two backplane connectors. But it only plugs into one backplane connector on the rear. But you got me thinking it must have a transformer in it to boost the (25VAC + 25VAC) to 110VAC even though the chart recorder takes up most of the double wide space, so I looked carefully and there is a very flat form factor transformer on one side. You have to remove the side cover to find it. So that is how they must be doing it. I bet they use the +/-33VDC or the +11VDC windings to power the rest of the unit Dennis Tillman W7PF Dennis Tillman W7PF -----Original Message----- -- Dennis Tillman W7PF TekScopes Moderator |
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Re: Just as modern as the day it came out
stefan_trethan
Beer goggles?
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ST On Mon, Jun 11, 2018 at 12:22 AM, Pete Lancashire <xyzzypdx@...> wrote:
I got to thinking today, how a 7603, 7A18, 7B53A etc looks as modern and |
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Re: OT: AT5005 spectrum analyzer display
Thanks Tony. Also, regarding your question about the CRT ID, I had the unit opened up for a while to try tweaking the settings and see the basic layout, and look for any obvious faults - none found. But, I put it back together already. Next time I open it I will look at the CRT closely. It's possible it's indicated in the HM5010 service manual. I don't recall that it had a parts list, but some of the part types are shown on the schematics - maybe the CRT too.
Ed |
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Re: Off Topic: Wanted Spectracom 8212 Chart Recorder Manual
Dennis, remember the TM500 has AC power available inside by virtue of the floating LV AC windings - two per slot, so two slots could give four windings at 24V-30V (I forget the specs) each that could add up to around 110-120V (especially if that's the only load) - probably close enough. Or, a single winding through a small step-up transformer could do it to. I presume the chart paper drive is one of those old-school synchronous clock motors with built-in gearbox to get whatever speed is needed. Those only take about 3W, as I recall.
Ed |
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Re: OT: AT5005 spectrum analyzer display
Attached operation manual , there are block diagram only , I do not have the service manual , hope it help .
Rd?Tony From: Yiu On Tony C via Groups.Io <tonycheung_hk@...> To: [email protected] Sent: Monday, June 11, 2018 7:42 AM Subject: Re: [TekScopes] OT: AT5005 spectrum analyzer display Can you see the CRT part number ? 從我的 iPhone 傳送 Ed Breya via Groups.Io <edbreya@...> 於 2018年6月11日 上午12:58 寫道： |
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Off Topic: Wanted Spectracom 8212 Chart Recorder Manual
I have a set of Spectracom WWV receiver TM500 plugins. I have manuals for
most of them but I am missing the manual for the dual wide 8212 Chart Recorder. This recorder uses two slots in a Tek TM5xx or TM5xxx mainframe. It receives a 0-1mA DC signal from the 8150 Precision Phase Comparator Aux Output front panel jack or the rear interface connector. It uses MP00025 Chart Paper. I searched google with no success. I have done google searches over the years in hopes that a manual might show up also with no success. The only marking of any kind inside the unit is a little paper label attached to the motor that that drives the chart paper. It says D-7710 Donaueschingen Stegmann and it lists the voltage the motor works on 3512-250/110V/60Hz. This is somewhat mysterious since the TM mainframes do not supply 110V on any of their connector pins. and this chart recorder works in any TM mainframe. I'm not sure how they do that but a manual or schematic should explain it. Thanks in advance, Dennis Tillman W7PF |
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Re: OT: AT5005 spectrum analyzer display
Can you see the CRT part number ?
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從我的 iPhone 傳送 Ed Breya via Groups.Io <edbreya@...> 於 2018年6月11日 上午12:58 寫道： |
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Re: 575 - advice sought from owners
Holy Formatting Failure Batman...... :-(
I uploaded the original spreadsheet here: /g/TekScopes/files/Tektronix%20575%20Parts On Sun, Jun 10, 2018 at 6:43 PM, David Holland <david.w.holland@...> wrote: For the PTM caps, in general, I used Mallory 630V polyester film caps |
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Re: 575 - advice sought from owners
For the PTM caps, in general, I used Mallory 630V polyester film caps
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from from Mouser.. I restuffed the electrolytic cans. I *think* this is the parts list I used when I restored the non-Mod122... If anyone uses it, please double check the parts, I sometimes make last minute substitutions, that may not have made it back into the spreadsheet. (Yes, I shot-gunned all EMC, and PTM capacitors and one cap I thought might of been a Micamold (paper) cap.) Identifier Capacitance Type Voltage Tolerance Part # C102 .047uf PTM 400v 539-150473J630EC 0.66 Mallory Polyester Film Capacitors 630V .047uF 5% C105 .047uf PTM 400v 539-150473J630EC 0.66 Mallory Polyester Film Capacitors 630V .047uF 5% C108 .047uf PTM 400v 539-150473J630EC 0.66 Mallory Polyester Film Capacitors 630V .047uF 5% C122 .047uf PTM 400v 539-150473J630EC 0.66 Mallory Polyester Film Capacitors 630V .047uF 5% C128 .047uf PTM 400v 539-150473J630EC 0.66 Mallory Polyester Film Capacitors 630V .047uF 5% C130 .047uf PTM 400v 539-150473J630EC 0.66 Mallory Polyester Film Capacitors 630V .047uF 5% C145 .0015uf Mica (mold) 500v 10.00% 5982-19-500V1500P 1.86 Cornell Dubilier Mica Capacitors MICA 1500pF 500V 5% C186 .022uf PTM 400v 539-150223J630DB 0.54 Mallory Polyester Film Capacitors 630V .022uF 5% C232 .001uf PTM 600v 539-150102K630BB 0.41 Mallory Polyester Film Capacitors 630V .001uF 10% C240 2000uf EMC 20v 661-EKMGG250ELL222MK 1.32 United Chemi-Con Aluminum Electrolytic Capacitors - Leaded 25volts 2200uF 12.5X25 C241 2000uf EMC 20v 661-EKMGG250ELL222MK 1.32 United Chemi-Con Aluminum Electrolytic Capacitors - Leaded 25volts 2200uF 12.5X25 C242 2000uf EMC 20v 661-EKMGG250ELL222MK 1.32 United Chemi-Con Aluminum Electrolytic Capacitors - Leaded 25volts 2200uF 12.5X25 C243 2000uf EMC 20v 661-EKMGG250ELL222MK 1.32 United Chemi-Con Aluminum Electrolytic Capacitors - Leaded 25volts 2200uF 12.5X25 C244 150uf EMC 150v 661-EKXG251ELL151MM2 2.01 United Chemi-Con Aluminum Electrolytic Capacitors - Leaded 250volts 150uF 18X25 C267 .001uf 600v 539-150102K630BB 0.41 Mallory C602 2 x 20uf EMC 450v 647-UVY2W220MHD (20uF) 1.14 Nichicon Aluminum Electrolytic Capacitors - Leaded 450volts 22uF 12.5x25 20% 5LS C611A,B 2 x 20uf EMC 450v 647-UPZ2W390MHD (39uF) 1.48 Nichicon Aluminum Electrolytic Capacitors - Leaded 450volts 39uF 12.5X35.5 20% C613 .01uf PTM 400v 539-150103K630BB 0.48 Mallory Polyester Film Capacitors 630V .01uF 10% C620 125uf EMC 350v 647-UPT2G121MHD 2.05 Nichicon Aluminum Electrolytic Capacitors - Leaded 400volts 120uF 16X40 20% C630 .01uf PTM 400v 539-150103K630BB 0.48 Mallory Polyester Film Capacitors 630V .01uF 10% C641 2 x 20uf EMC 450v 647-UVY2W220MHD 1.14 Nichicon Aluminum Electrolytic Capacitors - Leaded 450volts 22uF 12.5x25 20% 5LS C644 .01uf PTM 400v 539-150103K630BB 0.48 Mallory Polyester Film Capacitors 630V .01uF 10% C655 .01uf PTM 400v 539-150103K630BB 0.48 Mallory Polyester Film Capacitors 630V .01uF 10% C666 2 x 20uf EMC 450v 647-UVY2W220MHD 1.14 Nichicon Aluminum Electrolytic Capacitors - Leaded 450volts 22uF 12.5x25 20% 5LS C802 .001uf PTM 600v 539-150102K630BB 0.41 Mallory Polyester Film Capacitors 630V .001uF 10% C808 .01uf PTM 600v 539-150103K630BB 0.48 Mallory Polyester Film Capacitors 630V .01uF 10% C809 .001uf PTM 600v 539-150102K630BB 0.41 Mallory Polyester Film Capacitors 630V .001uF 10% C811 .047uf PTM 600v 10.00% 539-150473J630EC 0.66 Mallory Polyester Film Capacitors 630V .047uF 5% C816 .022uf PTM 600v 539-150223J630DB 0.54 Mallory Polyester Film Capacitors 630V .022uF 5% David On Sun, Jun 10, 2018 at 6:25 PM, tom jobe <tomjobe@...> wrote:
Hi David, |
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Re: 575 - advice sought from owners
tom jobe
Hi David,
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What type of capacitors do you suggest replacing the 575 paper caps with, and where do you buy them? Thank you to all that have contributed to this 575 topic! tom jobe... On 6/10/2018 3:17 PM, David Holland wrote:
There are a number of paper capacitors in the HV section. (Amongst other |
Yiu On Tony C
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